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    Wyświetlanie 1-26 z 26
    Tytuł:
    Processing, Microstructure and Dielectric Properties of the $Bi_5Ti_3FeO_{15}$ Ceramic
    Autorzy:
    Rymarczyk, J.
    Dercz, G.
    Ilczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811567.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.-s
    81.20.Ev
    81.05.Je
    61.05.cp
    68.37.Ef
    Opis:
    The aim of the present work is the analysis of microstructure, dielectric permittivity and thermal properties analysis of $Bi_5Ti_3FeO_{15}$ ceramics obtained by two methods. The studied $Bi_5Ti_3FeO_{15}$ ceramics were prepared by conventional synthesis and hot uniaxial pressing reaction from the conventional mixture of oxides, viz. $TiO_2$, $Fe_2O_3$, $Bi_2O_3$. The studied material has layered perovskite like structures, first described by Aurivillius in 1949 and Subbaro in 1969. The ceramic $Bi_5Ti_3FeO_{15}$ is known to contain a series of compounds with the general formula: $Bi_{m+1}Fe_{m-3}Ti_3O_{3m+3}$. The X-ray diffraction methods were used for qualitative phase analysis of studied samples. The morphology was analyzed by scanning electron microscopy method. The thermal properties of the studied materials were measured using the differential thermal analysis at a constant heating rate of 15 K/min under an argon protective atmosphere. Thermal dependence of dielectric permittivity was studied between room temperature and 1137 K.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-191-A-197
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of mechanical activation in synthesizing multiferroic Pb(Fe1/2Nb1/2)O3 powders
    Wykorzystanie mechanicznej aktywacji do syntetyzowania multiferroikowych proszków Pb(Fe1/2Nb1/2)O3
    Autorzy:
    Bochenek, D.
    Dercz, G.
    Oleszak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352621.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aktywacja mechaniczna
    multiferroics
    PFN
    spektroskopia Mössbauera
    mechanical activation
    PFN ceramics
    Mössbauer spectra
    Opis:
    In the study, the method of high-energy powder milling - mechanical activation (MA) was used for synthesizing Pb(Fe1/2Nb1/2)O3 (PFN) powders. For the purpose of comparing the influence of high-energy milling on PFN synthesis, two groups of powder samples were used. The first mixture consisting of simple oxide powders; the second one consisting of compound oxide powders. The obtained powders were subjected to structural analysis with the use of XRD and Mőssbauer spectroscopy. Tests revealed that during the process of high-energy milling of initial constituents a partial synthesis of PFN material phases occurs. By comparing the two methods of PFN synthesizing it may be stated that mechanical activation in the case of a simple oxide mixture (PFN1) is equally effective as for a compound oxide mixture (PFN2).
    W pracy, w procesie technologicznym, wykorzystano metodę wysokoenergetycznego mielenia proszków – mechanicznej aktywacji (MA) do syntezowania proszków Pb(Fe1/2Nb1/2)O3 (PFN). Do porównania wpływu wysokoenergetycznego mielenia na synteze PFN wykorzystano dwie grupy próbek proszkowych. Pierwsza mieszanine stanowiły proszki prostych tlenków (jednoetapowa metoda otrzymywania – PFN1), druga stanowiły proszki złozonych tlenków (dwuetapowa metoda otrzymywania – PFN2). Otrzymane proszki poddano analizie strukturalnej przy użyciu XRD i spektroskopii Mossbauera. Badania potwierdziły, ze podczas procesu wysokoenergetycznego mielenia składników wyjsciowych zachodzi czesciowa synteza faz materiału PFN. Porównujac dwie metody syntetyzowania PFN można stwierdzić, że mechaniczna aktywacja jest jednakowo skuteczna w przypadku mieszaniny prostych tlenków (PFN1) jak i dla mieszaniny złożonych tlenków (PFN2).
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 1015-1015
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of high energy ball milling on the structure and phase decomposition of the multiferroic Bi₅Ti₃FeO₁₅ ceramics
    Autorzy:
    Dercz, J.
    Zubko, M.
    Dercz, G.
    Matuła, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075760.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.85.+t
    61.05.cp
    68.37.Lp
    81.20.Wk
    Opis:
    The paper presents the results of the Bi₅Ti₃FeO₁₅ multiferroic phase stability analysis during high-energy ball milling aimed at obtaining fine dispersion ceramic powder. The X-ray diffraction and transmission electron microscopy methods were used to analyse the structure and verify the degree of crystallite dispersion. Structural data analysis was carried out using the Rietveld method. To carry out the analysis of the morphology, the scanning electron microscopy was used. The results that were obtained showed that the high energy ball milling process results in the decomposition of the initial ceramics, where finally Bi₅Ti₃FeO₁₅ and Bi are obtained. An increase in the proportion of the amorphous phase and an increase in the dispersion of the grains and crystallites of the powder that occurs with an increase in the milling time were observed.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 852-855
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Spectroscopy, X-Ray Diffraction and SEM Studies on Multiferroic $Bi_5Ti_3FeO_{15}$ Ceramics
    Autorzy:
    Rymarczyk, J.
    Hanc, A.
    Dercz, G.
    Ilczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811595.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.Qr
    81.05.Je
    68.37.Hk
    61.05.cp
    77.84.-s
    Opis:
    Magnetoelectric multiferroics are materials which exhibit both magnetic order and ferroelectricity in the same phase. Multiferroic materials, where ferroelectricity and magnetism coexist, were extensively studied. This class of materials offers a large application potential for new devices due to the two coupled degrees of freedom based on the local off-centered distortion and the electron spin. The studied $Bi_5Ti_3FeO_{15}$ ceramics was prepared by conventional synthesis and hot uniaxial pressing reaction applying the conventional mixture of $TiO_2$, $Fe_2O_3$ and $Bi_2O_3$ oxides as precursor materials. The present work focuses on the structure analysis of multiferroic $Bi_5Ti_3FeO_{15}$ ceramics performed by X-ray diffraction method, scanning electron microscopy and the Mössbauer spectroscopy methods.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1579-1584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Corrosion Resistance of Nanotubular Oxide Layers on the Ti13Zr13Nb Alloy in Physiological Saline Solution
    Ocena odporności korozyjnej nanotubularnych struktur tlenkowych na stopie Ti13Zr13Nb w środowisku płynów ustrojowych
    Autorzy:
    Smołka, A.
    Dercz, G.
    Rodak, K.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/352023.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    anodization
    corrosion resistance
    self-organized nanotubes
    Ti13Zr13Nb implant alloy
    anodowanie
    odporność na korozję
    nanotubularna struktura
    stop Ti13Zr13Nb
    Opis:
    Evaluation of corrosion resistance of the self-organized nanotubular oxide layers on the Ti13Zr13Nb alloy, has been carried out in 0.9% NaCl solution at the temperature of 37ºC. Anodization process of the tested alloy was conducted in a solution of 1M (NH4)2SO4 with the addition of 1 wt.% NH4F. The self-organized nanotubular oxide layers were obtained at the voltage of 20 V for the anodization time of 120 min. Investigations of surface morphology by scanning transmission electron microscopy (STEM ) revealed that as a result of the anodization under proposed conditions, the single-walled nanotubes (SWNTs) can be formed of diameters that range from 10 to 32 nm. Corrosion resistance studies of the obtained nanotubular oxide layers and pure Ti13Zr13Nb alloy were carried out using open circuit potential, anodic polarization curves, and electrochemical impedance spectroscopy (EIS) methods. It was found that surface modification by electrochemical formation of the selforganized nanotubular oxide layers increases the corrosion resistance of the Ti13Zr13Nb alloy in comparison with pure alloy.
    Przeprowadzono badania oceny odporności korozyjnej nanotubularnych struktur tlenkowych na stopie Ti13Zr13Nb w środowisku płynów ustrojowych. Określono wpływ obecności nanotubularnych struktur tlenkowych na zmianę odporności korozyjnej stopu Ti13Zr13Nb. Proces anodowania elektrochemicznego prowadzono w roztworze 1M (NH4)2SO4 z 1 % dodatkiem NH4F. Samoorganizujące się warstwy nanorurek otrzymano przy napięciu 20 V i czasie anodowania 120 min. Badania morfologii powierzchni metodą skaningowej transmisyjnej mikroskopii elektronowej ujawniły, że w wyniku anodowania w zaproponowanych warunkach można otrzymać nanorurki o średnicy mieszczącej się w zakresie od 10 do 32 nm. Badania odporności korozyjnej nanotubularnych warstw tlenkowych oraz czystego stopu Ti13Zr13Nb przeprowadzono w 0,9 % roztworze soli fizjologicznej NaCl w temperaturze 37ºC z wykorzystaniem metody potencjału obwodu otwartego, krzywych polaryzacji anodowej oraz elektrochemicznej spektroskopii impedancji. Wykazano, iż modyfikacja powierzchni za pomocą formowania nanotubularnych struktur tlenkowych zwiększa odporność korozyjną stopu Ti13Zr13Nb w porównaniu do czystego stopu.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2681-2686
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure characterization of biomedical Ti-Mo-Sn alloy prepared by mechanical alloying method
    Autorzy:
    Dercz, G.
    Matuła, I.
    Zubko, M.
    Liberska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1152952.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    87.85.J-
    81.20.Ev
    61.05.cp
    68.37.Og
    Opis:
    The study presents the results of the influence of high energy milling on the structure of the new Ti-15Mo-5Sn [wt%] alloy for biomedical applications. During testing the powders were milled for the following milling times: 5, 15, 30, and 45 h. The milled powders were characterized by X-ray diffraction, scanning and transmission electron microscopy methods. Observation of the powder morphology after various stages of milling leads to the conclusion that with the increase of the milling time the size of the powder particles as well as the degree of aggregation change. However, a clear tendency of particles reduction at every stage of the mechanical alloying process is clearly observed. The X-ray diffraction results confirmed the presence of the α and β phases, and molybdenum. It has been found that the reflections from the Sn phase disappeared after five hours of milling, suggesting that the Sn and Ti alloying took place, leading to the creation of a titanium-based solid solution. After 30 and 45 h of mechanical alloying the formation of the β-Ti phase, the final share of which is 46(4) wt%, was observed. Furthermore, it was found that a diffraction line broadening with the increase of the milling time results from reduction of the crystallite size and an increase in the lattice distortion. The maximum level of the reduction of the crystallite size was obtained after 45 h of milling. The maximum degree of the unit cells reduction for all phases present in the powder that was being milled was also observed for this milling time.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1029-1032
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioactive coatings obtained by electrophoretic deposition on Ti15Mo alloy
    Autorzy:
    Szklarska, M.
    Dercz, G.
    Łosiewicz, B.
    Stróż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/283998.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    biomaterials
    electrophoresis
    implants
    Źródło:
    Engineering of Biomaterials; 2016, 19, 138; 35
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Evolution of Ti/ZrO2 and Ti/Al2O3 Composites Prepared by Powder Metallurgy Method
    Autorzy:
    Dercz, G.
    Matuła, I.
    Gurdziel, W.
    Kuczera, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/353964.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    Ti-ZrO2
    Ti-Al2O3
    high energy ball milling
    Rietveld analysis
    Opis:
    The current study were performed in order to assess the fabrication possibility of the metal-ceramic composites based on nanocrystalline substrates. The influence of the variable time of the high energy ball-milling (10, 30 and 50 h) on the structure, pores morphology and microhardness of Ti/ZrO2 and Ti/Al2O3 compositions was studied. The X-ray diffraction analysis confirmed the composite formation for all milling times and sintering in the case of Ti/ZrO2 system. Decomposition of substrates during milling process of Ti/Al2O3 system was also observed. Additionally, the changes of lattice parameter as a function of milling time were studied. The morphology of powders and the microstructure of the sintered samples were observed by scanning electron microscopy (SEM). Also, analysis of microhardness and pores structure were performed.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 443-450
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The properties of (Pb0.97Ba0.03)[(Zr0.98Ti0.02)1-zSnz]O3 ceramics with 0 < z < 0.08
    Właściwości ceramiki (Pb0.97Ba0.03)[(Zr0.98Ti0.02)1-zSnz]O3 o wartościach 0 < z < 0,08
    Autorzy:
    Brzezińska, D.
    Skulski, R.
    Wawrzała, P.
    Dercz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/352351.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PBZT and PBZTS ceramics
    phase transitions
    dielectric properties
    ceramika PBZT i PBZTS
    przejście fazowe
    właściwości dielektryczne
    Opis:
    We present the results of obtaining and investigations of (Pb1-x Bax )((Zr1-yTiy) 1-zSnz )O3 (PBZTS) ceramics with x =const =0.03, y =const=0.02, z =0, 0.02, 0.04, 0.06 and 0.08. Investigated compositions are close to rhombohedral-orthorhombic morphotropic phase boundary. Ceramic samples have been obtained by conventional ceramic technology from oxides PbO, ZrO2, TiO2, SnO2 and barium carbonate BaCO3. The calcined powders were crushed and next pressed into discs and sintered free sintering (FS) method. For such obtained samples the following investigations have been done: EDS, XRD, microstructure of fractured samples, dielectric measurements, P-Ehysteresis loops investigations at various temperatures.
    Przedstawiono wyniki badań ceramiki (Pb1-x Bax )((Zr1-yTiy) 1-zSnz )O3 (PBZTS) dla stałych wartości parametrów ,v =0,03 i y =0,02 oraz z =0, 0,02, 0,04, 0,06 i 0,08. Badane składy PBZTS znajdują się w pobliżu granicy fazowej między fazami o romboedrycznej i ortorombowej deformacji komórek elementarnych. Ceramiczne próbki PBZTS zostały otrzymane z prostych tlenków PbO, ZrO2, TiO2, SnO2 i węglanu baru BaCO3. Proszki po kalcynacji zostały rozdrobnione, a następnie uformowano z nich wypraski i zagęszczono metodą swobodnego spiekania (FS). Dla otrzymanych próbek PBZT/PBZTS przeprowadzono badania EDS, XRD, badania mikrostruktury przełamów, badania podstawowych właściwości dielektrycznych, badania pętli histerezy w różnych temperaturach.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1377-1380
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semi-conducting properties of titanium dioxide layer on surface of Ti-15Mo implant alloy in biological milieu
    Autorzy:
    Szklarska, M.
    Dercz, G.
    Kubisztal, J.
    Balin, K.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1152668.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jj
    82.45.Bb
    72.20.-i
    Opis:
    The object of this work was to investigate structure, electrochemical behavior and semiconducting properties of the TiO₂ oxide layer on the Ti-15Mo implant alloy surface in normal and inflammatory conditions of physiological saline solution. X-ray photoelectron spectroscopy measurements confirm the presence of the oxide layer on the Ti-15Mo alloy surface. Electrochemical studies indicate excellent corrosion resistance of Ti-15Mo alloy in physiological saline solution. It was found that the investigated material under normal and inflammatory conditions behave like an insulator and n-type semiconductor, respectively.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1085-1087
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of high energy milling time on the Ti-50Ta biomedical alloy structure
    Autorzy:
    Matuła, I.
    Dercz, G.
    Zubko, M.
    Prusik, K.
    Pająk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153599.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    81.05.Zx
    81.07.Wx
    81.20.Ev
    Opis:
    Nickel-free titanium alloys are a promising research direction in the field of biomedical materials. Current literature reports indicate that there is a possibility of using the Ti-Ta alloys in medicine since these alloys have had satisfactory results as far as biocompatibility, resistance to corrosion and mechanical properties are concerned, which is an important aspect while considering the use of this alloy for long-lasting bone implants. This article presents the results of a high-energy milling process with the use of Ti and Ta powders. The ball-milling process was carried out for various times, including 20, 40, 60, 80, and 100 h. The samples were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The research confirmed partial synthesis of the materials during the process of high energy ball milling.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1033-1036
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical formation of second generation TiO₂ nanotubes on Ti13Nb13Zr alloy for biomedical applications
    Autorzy:
    Stróż, A.
    Dercz, G.
    Chmiela, B.
    Stróż, D.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153606.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jj
    81.07.De
    82.47.-a
    Opis:
    The aim of this study was to obtain the second generation TiO₂ nanotubes on the Ti13Nb13Zr alloy. Anodic oxidation of the alloy under study was carried out in 1 M (NH₄)₂SO₄ electrolyte under voltage-time conditions of 20 V for 120 min. The morphological parameters of the obtained nanotubes of second generation such as the length (L), internal (D_{i}) and outer (D_{o}) diameter of nanotube were determined. It was found that the anodic oxidation of the Ti13Nb13Zr alloy conducted under proposed conditions allowed to obtain the single-walled nanotubes of the following geometrical parameters: the internal diameter 61 nm, outer diameter 103 nm, and the length 3.9 μm. The total surface area of the single-walled nanotubes was equal to 4.1 μm², and the specific surface area per cm² (A_{s}) was estimated to be 15.6 cm²/cm². Formation mechanism, structure and optimal morphological parameters of the obtained single-walled nanotubes on the Ti13Nb13Zr alloy have been discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1079-1080
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioelectrochemical properties of Ti13Nb13Zr alloy before and after surface modification
    Autorzy:
    Stróż, A.
    Luxbacher, T.
    Łosiewicz, B.
    Dercz, G.
    Goryczka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/285758.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    titanium alloys
    biocompatibility
    surface modification
    Źródło:
    Engineering of Biomaterials; 2016, 19, 138; 50
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technology and Dielectric Properties of the KNLN Doped with Nd3+ and Pr3+ Ions
    Autorzy:
    Bochenek, D.
    Osińska, K.
    Mankiewicz, M.
    Niemiec, P.
    Dercz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/352226.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lead free ceramics
    sodium potassium niobate
    ferroelectrics
    doped
    Opis:
    The paper presents the technology and basic properties of three compositions of lead-free ceramics: (i) (K0.44Na0.52Li0.04)NbO3, (ii) (K0.44Na0.52Li0.04)NbO3)NbO3 +0.5%mol Nd2O3 and (iii) (K0.44Na0.52Li0.04)NbO3)NbO2+0.5%mol Pr2O3. Powders of the designed compositions based on KNLN were obtained with the classic ceramic technology, as a result of solid phase synthesis, from a mixture of simple oxides and carbonates. The synthesis of ceramic powders was carried out at Ts = 900°C for ts = 4 h, while compaction by free sintering at Tsint = 1100°C for tsint = 2 h. XRD studies have shown that doping with praseodymium and neodymium promotes the formation of the tetragonal phase in the base composition (K0.44Na0.52Li0.04)NbO3)NbO3 at lower temperatures. On the other hand, microstructural tests have shown that the admixture of neodymium and praseodymium improves the sinterability of ceramic samples during the technological process; however, the ceramic samples still exhibit high porosity.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1183-1188
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Passivation Type on Corrosion Resistance of Ti15Mo Alloy in Simulated Body Fluids
    Wpływ rodzaju pasywacji powierzchni stopu Ti15Mo na jego odporność korozyjną w środowisku płynów ustrojowych
    Autorzy:
    Szklarska, M.
    Dercz, G.
    Rak, J.
    Łosiewicz, B.
    Simka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/353709.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomaterial
    electrochemical impedance spectroscopy
    corrosion resistance
    passivation
    titanium alloys
    biomateriały
    elektrochemiczna spektroskopia impedancyjna
    odporność na korozję
    pasywacja
    stopy tytanu
    Opis:
    This work reports on determination of the influence of passivation type of Ti15wt.%Mo implant alloy surface on its corrosion resistance in simulated body fluids. The alloy under investigation was subjected to natural self-passivation in air, and forced passivation by autoclaving in steam, boiling in 30 % solution of H2O2, and electrochemical passivation in 0.9 % NaCl solution. Resistance of the passivated Ti15Mo alloy to pitting corrosion was studied at 37ºC in 0.9 % NaCl solution using open circuit potential method, anodic polarization curves, and electrochemical impedance spectroscopy (EIS). Comparative estimation of the determined parameters of corrosion resistance revealed that the obtained passive layers improve anticorrosive properties of the tested alloy. Surface of the alloy subjected to passivation in steam autoclave reveals the highest protection against pitting corrosion. Anodic potentiodynamic curves showed that the Ti15Mo alloy after different passivation types of the surface is characterized by a lack of susceptibility to pitting corrosion up to potential of 9 V. Based on the EIS investigations, the thickness of the formed oxide layers (TiO2, anatase) was determined to be in the range from 2.0 to 7.8 nm in dependence on the applied type of passivation. It was ascertained that electrochemical properties of the Ti15Mo alloy and possibility of its surface passivation using simple methods, make it an attractive material for use in biomedicine for long-term implants.
    Praca dotyczy określenia wpływu rodzaju pasywacji powierzchni stopu Ti15%wag.Mo na jego odporność korozyjną w środowisku płynów ustrojowych. Badany stop poddano naturalnej samopasywacji w powietrzu oraz wymuszonej pasywacji w autoklawie parowym, w gotującym się 30 % roztworze H2O2 oraz elektrochemicznej pasywacji w 0,9 % roztworze NaCl. Odporność pasywowanego stopu Ti15Mo na korozję wżerową badano w temperaturze 37°C w roztworze 0,9 % NaCl metodą potencjału obwodu otwartego, krzywych polaryzacji anodowej oraz elektrochemicznej spektroskopii impedancyjnej (ESI). Ocena porównawcza wyznaczonych parametrów odporności korozyjnej wykazała, że wytworzone warstwy pasywne poprawiają właściwości antykorozyjne badanego stopu. Powierzchnia stopu poddana pasywacji w autoklawie parowym wykazuje najwyższą ochronę przed korozją wżerową. Anodowe krzywe potencjodynamiczne ujawniły, że stop Ti15Mo poddany różnym sposobom pasywacji powierzchni wykazuje brak podatności na korozję wżerową aż do potencjału wynoszącego 9 V. W oparciu o badania ESI wyznaczona została grubość otrzymanych warstw tlenkowych (TiO2, anataz), która w zależności od zastosowanego sposobu pasywacji mieściła się w zakresie od 2,0 do 7,8 nm. Stwierdzono, że właściwości elektrochemiczne stopu Ti15Mo oraz możliwość pasywowania jego powierzchni prostymi metodami, czynią go atrakcyjnym materiałem do zastosowań w biomedycynie na implanty długoterminowe.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2687-2694
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and corrosion resistance of nickel-molybdenum alloy coatings
    Autorzy:
    Popczyk, M.
    Zacharz, M.
    Osak, P.
    Dercz, G.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1154527.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.-z
    82.45.Qr
    82.45.Bb
    Opis:
    Electrolytic Ni-Mo alloy coatings were obtained from the galvanic bath, at the temperature of T= 60°C under galvanostatic conditions using a cathodic current density of j= 80 mA cm¯². Surface morphology was studied using a scanning electron microscopy. Chemical composition of obtained coatings was determined by the energy dispersive spectroscopy. Structural studies were carried out using an X-ray diffraction method. Electrochemical corrosion resistance tests were carried out in 5% NaCl solution. It was found that X-ray diffraction investigations of all obtained coatings showed the characteristic "halo", which suggests that the obtained deposits have an amorphous structure. Chemical composition and corrosion resistance of the electrolytic Ni-Mo coatings depend on the concentration of Na₂MoO₄· 2H₂O in a galvanic bath. With the increase of the molybdenum content in the alloy coatings, their corrosion resistance increases.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1072-1074
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Formation of Self-Organized Nanotubular Oxide Layers on Ti13Zr13Nb Alloy for Biomedical Applications
    Autorzy:
    Smołka, A.
    Rodak, K.
    Dercz, G.
    Dudek, K.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1361071.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jj
    81.07.De
    87.85.J-
    Opis:
    In this work, the anodic formation of self-organized nanotubular oxide layers on Ti13Zr13Nb implant alloy was presented. Anodic oxidation was carried out at room temperature in [1 M] $(NH_4)_2SO_4$ solution with 1 wt% content of $NH_4F$. The voltage and time of anodization was 20 V for 120 min, respectively. Under proposed conditions, the best arrangement of nanopores was observed. The physical and chemical properties of the anodized surface of the Ti13Zr13Nb alloy were characterized using grazing incidence X-ray diffraction, scanning transmission electron microscopy, and atomic force microscopy. It was found that diameter of nanopores varied from 10 to 32 nm. Mechanism of the fabrication of the unique 3D tube-shaped nanostructure of $TiO_2$ on the surface of the Ti13Zr13Nb alloy by electrochemical anodization, has been discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 932-935
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Composition of Urban Soils by X-Ray Diffraction and Mössbauer Spectroscopy Analysis
    Autorzy:
    Kierlik, P.
    Hanc-Kuczkowska, A.
    Męczyński, R.
    Matuła, I.
    Dercz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/353120.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mössbauer spectroscopy
    X-ray diffraction
    environmental protection
    qualitative phase analysis
    topsoil
    Opis:
    The main purpose of this study was to identify the mineral composition of soil sample taken from the upper layer of topsoil. High absorption of chemical substance is a characteristic for humus-organic layer of topsoil. The source of those substance could be a pollutant emitted to the atmosphere by human activity. The research area includes Upper Silesia region, which is the most industrial region of Poland. In the present study, the phase composition of the top soil separates were analyzed by using X-raydiffraction and Mössbauer spectroscopy. X-ray diffraction analysis revealed the presence of seven mineral phases in the material magnetic separated by lower current (quartz, illite, kaolinite, Fe3+ oxides, hematite, magnetite and pyrite). In case of higher current were identified four phases (quartz, muscovite, kaolinite and K0.94 Na0.06 (AlSi3 O8 )). Mössbauer spectroscopy was used for an extensive analysis of iron-containing phases (pyrrhotite, magnetite, aluminosilicate oxides with Fe3+ and kaolinite/Fe2+ silicate).
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1029-1032
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Point Defects in the B2-Phase Region of the Fe-Al System by Mössbauer Spectroscopy
    Autorzy:
    Hanc, A.
    Kansy, J.
    Dercz, G.
    Pająk, L.
    Oleszak, D.
    Mrzigod, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811589.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    61.72.J-
    76.80.+y
    Opis:
    In this work, we employed the Mössbauer spectroscopy and X-ray powder diffraction in a study of point defect formation in intermetallic phases of the B2 structure of the Fe-Al system as a function of Al concentration. The results are compared with the concentrations of point defect determined from positron annihilation data. In the Mössbauer effect, two types of samples are investigated: Fe-Al alloys with few additives obtained by induction melting and Al-rich metallic powders produced by the self-decomposition method and intensive grinding of high energy in the electro-magneto-mechanical mill. We present the values of the $\text{}^{57}Fe$ isomer shift and quadrupole splitting for the components describing the point defect in the local environment of a Mössbauer nuclide. The concentration of the Fe vacancies and Fe atoms substituting Al (Fe-AS) are determined. The results showed that an increase in Al content causes an increase in vacancy and Fe-AS concentration.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1555-1562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Analysis of Equiatomic Multi-Component Ni20Ti20Ta20Co20Cu20 Alloy
    Autorzy:
    Glowka, K.
    Zubko, M.
    Świec, P.
    Prusik, K.
    Dercz, G.
    Stróż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/355419.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermodynamics
    high entropy alloys
    multi-component alloys
    electron microscopy
    microstructure
    Opis:
    An equiatomic multi-component alloy Ni20Ti20Ta20Co20Cu20 (at.%) was obtained using vacuum arc melting. In order to characterize such an alloy, microstructure analysis has been performed using Scanning and Transmission Electron Microscopy, Electron Backscattered Diffraction, X-ray Diffraction and Energy Dispersive X-ray Spectroscopy techniques. Microstructure analysis revealed the presence of one rhombohedral and two cubic phases. Energy Dispersive X-ray Spectroscopy measurements revealed that both observed phases include five chemical elements in the structure. Using Rietveld refinement approach the lattice parameters were refined for the observed phases.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 785-789
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Long-Term Corrosion Performance of Ti15Mo Alloy in Saline Solution
    Autorzy:
    Szklarska, M.
    Łosiewicz, B.
    Dercz, G.
    Zubko, M.
    Albrecht, R.
    Stróż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/357034.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomaterial
    corrosion resistance
    passivation
    structure
    titanium alloys
    Opis:
    The Ti15Mo alloy has been studied towards long-term corrosion performance in saline solution at 37°C using electrochemical impedance spectroscopy. The physical and chemical characterization of the material were also investigated. The as-received Ti15Mo alloy exhibits a single β-phase structure. The thickness of single-layer structured oxide presented on its surface is ~4 nm. Impedance measurements revealed that the Ti15Mo alloy is characterized by spontaneous passivation in the solution containing chloride ions and formation of a double-layer structured oxide composed of a dense interlayer being the barrier layer against corrosion and porous outer layer. The thi ckness of this oxide layer, estimated based on the impedance data increases up to ~6 nm during 78 days of exposure. The obs erved fall in value of the log|Z|f=0.01 Hz indicates a decrease in pitting corrosion resistance of Ti15Mo alloy in saline solution along with the immersion time. The detailed EIS study on the kinetics and mechanism of corrosion process and the capacitive behavior of the Ti15Mo electrode | passive layer | saline solution system was based on the concept of equivalent electrical circuit with respect to the physical meaning of the applied circuit elements. Potentiodynamic studies up to 9 V vs. SCE and SEM analysis show no presence of pitting corrosion what indicates that the Ti15Mo alloy is promising biomaterial to long-term medical applications.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 773-778
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alginate Biopolymer Coatings Obtained by Electrophoretic Deposition on Ti15Mo Alloy
    Autorzy:
    Szklarska, M.
    Dercz, G.
    Simka, W.
    Dudek, K.
    Starczewska, O.
    Łężniak, M.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1360727.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.18.Fx
    87.85.J-
    82.35.Pq
    87.15.rp
    81.15.-z
    Opis:
    In this work, the electrophoretic deposition method has been developed for the fabrication of bioactive alginate coatings on the surface of Ti15Mo implant alloy. Thin ZnO film was deposited cataphoretically as the interlayer prior to anaphoretic deposition of alginate (Alg) which was performed from aqueous solution containing 1 g $dm^{- 3}$ of NaAlg at room temperature. The deposition voltage and time varied in the range 20-50 V and 30-120 min, respectively. The microstructure of Alg coatings was studied by scanning electron microscope, and the surface roughness was analysed using atomic force microscopy. Structure was studied by grazing incidence X-ray diffraction. Chemical composition and functional group were examined using energy dispersive spectrometry and attenuated total reflectance Fourier transform infrared spectroscopy methods, respectively. It was found that controlling the deposition conditions it is possible to obtain amorphous Alg coatings of variable thickness and porosity. Mechanism of electrophoretic deposition of bioactive Alg coatings on the Ti15Mo alloy surface was discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 919-923
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Ti-6Al-4V Alloy Surface by EPD-PEO Process in ZrSiO4 Suspension
    Modyfikacja powierzchni stopu Ti-6Al-4V metodą PEO-EPDw zawiesinie ZrSiO4
    Autorzy:
    Krząkała, A.
    Młyński, J.
    Dercz, G.
    Michalska, J.
    Maciej, A.
    Niużyła, Ł.
    Simka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/356201.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti-6Al-4V alloy
    suspension
    anodic oxidation
    zirconium silicate
    stop Ti6Al4V
    zawiesina
    utlenianie anodowe
    krzemian cyrkonu
    Opis:
    Investigations on the surface modification of the Ti-6Al-4V alloy by plasma electrolytic oxidation are reported here. The oxidation process was carried out in a solution containing a zirconium silicate (ZrSiO4) suspension and sodium hydroxide (NaOH). Anodising was realised at voltages in a range from 100 V to 250 V. It was found that the morphology of the sample surface did not change during the oxidation of the alloy at 100 V. Application of voltages higher than 100 V led to the incorporation of zirconium silicate into the formed oxide layer and to significant changes of the surface morphology.
    W pracy przedstawiono wyniki badań nad modyfikacją powierzchni stopu Ti-6A1-4V metodą plazmowego utleniania elek- trochemicznego. Proces ten prowadzono w roztworze zawierającym zawiesinę krzemianu cyrkonu (ZrSiO4 oraz wodorotlenek sodu (NaOH). Anodowanie prowadzono w zakresie napięcia od 100 do 250 V. Stwierdzono, że zastosowanie napięcia 100 V nie powoduje zmian w morfologii powierzchni stopu. Natomiast zastosowanie napięcia wyższego od 100 V powoduje wbudowanie krzemianu cyrkonu w tworzącą się warstewką tlenową oraz znaczne zmiany w morfologii powierzchni stopu Ti-6A1-4V.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 199-204
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Studies with the Use of XRD and Mössbauer Spectroscopy οf $Bi_5Ti_3FeO_{15}$ Ceramic Powders Obtained by Mechanical Synthesis
    Autorzy:
    Dercz, G.
    Rymarczyk, J.
    Hanc, A.
    Prusik, K.
    Babilas, R.
    Pająk, L.
    Ilczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811608.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.Qr
    61.05.C-
    61.05.J-
    81.07.Bc
    81.20.Wk
    Opis:
    In this paper the structural and Mössbauer spectral properties of multiferroic ceramic $Bi_5Ti_3FeO_{15}$ powders prepared by high-energy ball milling of polycrystalline precursor material (mixture of $Bi_2O_3$, $TiO_2$ and $Fe_2O_3$ powders) are presented. Mechanical synthesis was performed by high-energy vibratory mill. The X-ray diffraction methods were applied for the structure characterization of the studied samples. The parameters of diffraction line profiles were determined by PRO-FIT Toraya procedure. The crystallite sizes and lattice distortions were analyzed using the Williamson-Hall method. Investigations of hyperfine interactions in the studied materials were carried out by the Mössbauer spectroscopy. The powder morphology was analyzed by scanning electron microscopy and transmission electron microscopy techniques. It was found that during high-energy milling phase transitions, a decrease in crystallite size and amorphization process are observed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1623-1629
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Properties of YSZ Coatings Prepared by Plasma Spray Physical Vapor Deposition for Biomedical Application
    Autorzy:
    Barczyk, J.
    Dercz, G.
    Matuła, I.
    Góral, M.
    Maszybrocka, J.
    Bochenek, D.
    Gurdziel, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/356455.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PS-PVD method
    bioactive coatings
    cp-Ti
    YSZ
    osseointegration
    Opis:
    This paper presents the study of microstructure and properties of 8 mol% yttrium stabilized zirconia coating fabricated by Plasma Spray Physical Vapor Deposition technique on commercial pure titanium. The coating was characterized by X-ray diffraction, high resolution scanning electron microscope, profilometer, nanoindentation and nanomachining tests. The X-ray phase analysis exhibit the tetragonal Zr0.935 Y0.065O1.968, TiO and α-Ti phases. The Rietveld refinement technique were indicated the changes of crystal structure of the produced coatings. The characteristic structure of columns were observed in High Resolutions Scanning Electron Microscopy. Moreover, the obtained coating had various development of surfaces, thickness was equal to 3.1(1) μm and roughness 0.40(7) μm. Furthermore, the production coatings did not show microcracks, delamination and crumbing. The performed experiment encourages carried out us to tests for osseointegration.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 779-783
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure of Multi-Component Ni35Ti35Ta10Co10Cu10 Alloy
    Autorzy:
    Glowka, K.
    Zubko, M.
    Świec, P.
    Prusik, K.
    Dercz, G.
    Matyja, E.
    Stróż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/353190.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloys
    multi-component alloys
    electron microscopy
    microstructure
    Opis:
    A new NiTi-based multi-component Ni35 Ti35 Ta10 Co10 Cu10 (at.%) alloy was obtained by vacuum arc melting. The microstructure of the alloy has been studied using scanning and transmission electron microscopy, backscatter electron diffraction and X-ray diffraction techniques. The performed measurements showed presence of two cubic and one tetragonal phases. Energy dispersive X-ray spectroscopy analysis confirmed that all the observed phases contained all five principal elements.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 715-719
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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