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Wyszukujesz frazę "Surowiec, M." wg kryterium: Autor

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    Wyświetlanie 1-14 z 14
    Tytuł:
    Evolution of the β Phase Flux Dissolution during Quasicrystal Formation
    Autorzy:
    Surowiec, M.
    Bogdanowicz, W.
    Sozańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373540.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    61.44.Br
    Opis:
    This study focuses mainly on the verification of a peritectic reaction during the crystallization of quasicrystals. The β and λ phases apparently provide the necessary material for crystallization of the quasicrystalline ψ phase. We present results of an experimental visualization of the evolution of the flux dissolution process of the high temperature β phase. Solidified droplets of the β phase, formed primarily by the surface tension of the liquid within a bubble or a shrinkage, after crumbling during the flux dissolution may contribute to the quasicrystal formation process according to a peritectic reaction: $β_{c}$ + λ + L → ψ, where $β_{c}$ denotes the crumbled β phase immersed in the liquid.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 594-596
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Decorations of Al-Cu-Fe and Al-Cu-Co Single Quasicrystals
    Autorzy:
    Surowiec, M.
    Bogdanowicz, W.
    Krawczyk, J.
    Sozańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373609.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.44.Br
    Opis:
    We studied surface decorations of faceted icosahedral Al-Cu-Fe and decagonal Al-Cu-Co single quasicrystals by the scanning electron microscopy using primary and secondary electrons. Both types of single quasicrystals exhibited decorations on their facets, however the character of the decorations was totally different. Three kinds of decorations has been developed. On icosahedral $Al_{60}Cu_{26}Fe_{14}$ quasicrystals we found three kinds of decorations: cellular, cavity type and fractal-like. There was no evident difference in chemical composition between the inner dodecahedra and the decorations of all types. Surface decorations found on decagonal $Al_{73.5}Cu_{17.5}Co_9$ quasicrystals formed a kind of irregular dendritic stars on the separate bright islands.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 597-598
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Synthesis and Properties of High Surface Area $Fe_{2}O_{3}$ Materials
    Autorzy:
    Surowiec, Z.
    Gac, W.
    Wiertel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506442.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    78.67.Bf
    78.67.Rb
    75.20.-g
    Opis:
    Two types of the silica materials were used for the preparation of iron oxides. The MCM-48 type silica support and wide-pore silica gel were impregnated with iron nitrates. The samples were investigated by the nitrogen adsorption/desorption method, X-ray diffraction, scanning electron microscopy, and $\text{}^{57}Fe$ Mössbauer spectroscopy. Redox properties were studied by the temperature programmed reduction method. Strongly dispersed hematite was evidenced on the supports. An application of the MCM-48 silica mesoporous materials led to the development of the oxide phases within the ordered porous structure. The detailed temperature programmed reduction studies evidenced slight differences of the redox properties of the species located within the silica templates and after their removal. Magnetic properties of iron oxides were related to the porous structure of the silica supports. The Mössbauer study of high surface area materials Fe/$SiO_{2}$ and Fe/MCM-48 type silicate templates revealed existence of ferro- and superparamagnetic phases. The relative contribution of the superparamagnetic doublet component in Mössbauer spectra is 15% and 80% for Fe/$SiO_{2}$/c and Fe/MCM-48/c samples, respectively.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 18-20
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation in $MnFe_2O_4$/MCM-41 Nanocomposite
    Autorzy:
    Wiertel, M.
    Surowiec, Z.
    Gac, W.
    Budzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1339369.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    34.80.Lx
    78.67.Bf
    62.23.Pq
    68.43.-h
    75.50.Gg
    78.47.D-
    Opis:
    In the paper results of studies of $MnFe_2O_4$/MCM-41 nanocomposites have been presented. The influence of manganese ferrite loading on changes of porous properties of mesoporous MCM-41 structure was studied by means of $N_2$ sorption/desorption method and positron annihilation lifetime spectroscopy. Disappearance of the longest-lived ortho-positronium component ($τ_5$) of pure MCM-41 mesoporous material in the positron annihilation lifetime spectra of $MnFe_2O_4$/MCM-41 measured in vacuum is a result of either o-Ps quenching or the Ps inhibition mechanism. Filling of pores in the studied nanocomposites by air at ambient pressure causes partial reappearance of the ($τ_5$) component except for the sample with maximum ferrite content. Both the ($τ_5$) component lifetime and intensity are suppressed together with increasing $MnFe_2O_4$ content by chemical quenching and inhibition of Ps formation occur. Observed anti-quenching effect of air is a result of two processes: neutralization of some surface active centres acting as inhibitors and considerably weaker paramagnetic quenching by $O_2$ molecules.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 793-797
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Reduction Process on the Iron-Molybdenum Nanoparticles in Modified MCM-41 Silica
    Autorzy:
    Surowiec, Z.
    Wiertel, M.
    Gac, W.
    Budzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1381974.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    78.67.Bf
    78.67.Rb
    75.20.-g
    Opis:
    Iron-molybdenum silica mesoporous materials were obtained by the application of direct hydrothermal method. The influence of high temperature samples reduction in the $H_2$ flow on their structural and magnetic properties was studied. Four samples with different metal contents relative to silica were investigated. The study was carried out by means of X-ray diffraction, $\text{}^{57}Fe$ Mössbauer spectroscopy and the temperature programmed reduction method. With an increasing metals content, primary pores of MCM-41 transformed into the bottle-like pores, and then into the slit-like ones. Reduction and heat treatment caused the α-Fe, $Fe_2Mo$, and Fe-Mo alloy formation. Iron and molybdenum atoms after being released into the silica matrix, where they were embedded, create clusters or crystallites. It was observed that the high temperature reduction caused partial transformation of highly dispersed Fe-Mo oxides species initially embedded in silica walls into crystallites big enough to give magnetic sextet component in the Mössbauer spectra.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 846-849
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer and X-ray Diffraction Studies of Zr$\text{}_{1-x}$Ti$\text{}_{x}$Fe$\text{}_{2}$ Laves Phase Compounds
    Autorzy:
    Budzyński, M.
    Sarzyński, J.
    Surowiec, Z.
    Wiertel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028966.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.30.Gs
    77.80.Bh
    75.30.Kz
    Opis:
    Mössbauer spectroscopy of $\text{}^{57}$Fe and X-ray diffraction measurements in the Zr$\text{}_{1-x}$Ti$\text{}_{x}$Fe$\text{}_{2}$ phase have been made. Our X-ray diffraction spectra revealed that the samples have the cubic C15 crystal structure for low Ti concentration and the hexagonal C14 structure for high Ti concentration. In the range of 0.2≤x≤0.5 a mixture of both structures occurs. The investigated compounds are paramagnetic at RT for x>0.80 and magnetic for x
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 717-722
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $\text{}^{57}Fe$ Hyperfine Interactions in the $Sc(Fe_{1-x}Ni_x)_2$ Laves Phases Synthesized under High Pressure
    Autorzy:
    Wiertel, M.
    Surowiec, Z.
    Budzyński, M.
    Tsvyashchenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811581.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    77.80.Bh
    75.30.Kz
    07.35.+k
    Opis:
    The structural and microscopic magnetic properties of the pseudobinary $Sc(Fe_{1-x}Ni_x)_2$ system prepared under high pressure of 8 GPa were studied by X-ray diffraction and Mössbauer measurements in the range of 0.0 ≤ x ≤ 0.60. The samples for 0.0 ≤ x ≤ 0.10 have the hexagonal C14-type structure and those for 0.30 ≤ x ≤ 0.60 crystallize in the C15-type structure. Both the magnetic hyperfine field on $\text{}^{57}Fe$ and the Curie temperature decrease with the increasing Ni content and the system becomes paramagnetic for x ≈ 0.60 at room temperature. The form and temperature dependences of the Mössbauer spectra for 0.40 ≤ x ≤ 0.50 indicate the coexistence of paramagnetic and ferromagnetic regions in the samples and occurrence of magnetic clusters with a wide distribution of the Curie temperatures. It is interesting that $T_C$ for the compounds obtained under high pressure are by about 100 K smaller in comparison with those for the isostructural samples produced under normal pressure even though interatomic distances are practically equal in the both types of compounds.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1517-1527
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation Studies of Mesoporous Iron-Molybdenum Modified MCM-41 Silica
    Autorzy:
    Surowiec, Z.
    Wiertel, M.
    Gac, W.
    Budzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1339204.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Lx
    78.67.Bf
    78.70.Bj
    62.23.Pq
    78.67.Sc
    Opis:
    Iron-molybdenum modified MCM-41 mesoporous materials were obtained by the application of direct hydrothermal method. An incorporation of iron and molybdenum ions in the synthesis stage led to structural changes of the MCM-41 support. With an increasing metals content, cylindrical pores of silica are destroyed. X-ray diffraction investigations indicated that both iron and molybdenum ions were first embedded in the silica walls and then formed highly dispersed species in the pores. The porous structure of the studied samples was examined by means of $N_2$ adsorption/desorption and PALS methods. The longest-lived o-Ps lifetime component remains constant but its intensity monotonically decreases, except for the sample with the highest metals content. These results indicate that an effect of o-Ps formation inhibition occurs.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 789-792
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    B8-Type Solid Solutions of Manganese Antimonide and Cu, Zn, Al, or Si
    Autorzy:
    Budzyński, M.
    Mitsiuk, V.
    Surowiec, Z.
    Tkachenka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1358621.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Np
    76.80.+y
    Opis:
    The solid solutions with B8-type of crystal structure were prepared in ternary systems MnSb(Zn), MnSb(Cu), MnSb(Al), and MnSb(Si). The ranges of B8 solid solutions existence are limited. The structural and magnetic characteristics were investigated by X-ray powder diffraction, magnetization measurements and the Mössbauer spectroscopy.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 840-842
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation in Magnetite Nanopowders Prepared by Co-Precipitation Method
    Autorzy:
    Durak, K.
    Wiertel, M.
    Surowiec, Z.
    Miaskowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033944.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Wx
    47.65.Cb
    78.70.Bj
    61.72.J-
    61.72.Mm
    68.37.Hk
    Opis:
    Nanosized iron oxide powders are materials considered with regard to its application in medical therapy called hyperthermia. Magnetite nanopowders with crystallite size varying from 6.6 to 11.8 nm have been prepared by the co-precipitation method. In this study a change of a crystallite size is driven mainly by varying of initial pH of water ammonia solution in which a process of magnetite precipitation runs. Crystallographic structures and phase composition obtained samples and the size of magnetite nanoparticles were determined by X-ray diffraction method. Positron lifetime spectroscopy has been used to assess defectiveness of microstructure. Experimental positron annihilation spectra were successfully resolved into three lifetime components. It appears that from point of view of microstructure the defects concentrations in studied nanopowder samples are very high which causes a saturation of positron trapping.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1593-1597
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Nanoparticles in MCM-41 Type Mesoporous Silica
    Autorzy:
    Surowiec, Z.
    Bierska-Piech, B.
    Wiertel, M.
    Budzyński, M.
    Goworek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811605.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Bf
    81.07.Bc
    76.80.+y
    Opis:
    Structural phase transformations and magnetic properties of mesoporous MCM-41 template modified with iron and nickel salts were studied by nitrogen physisorption, X-ray diffraction, Mössbauer spectroscopy and transmission electron microscopy. The FeNi-oxide or the bimetallic crystal structure is formed for low and high Ni concentrations, respectively. The average size of nanoparticles is about 10 nm. About 70% of particles exist in a superparamagnetic state at room temperature.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1605-1613
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of N₂⁺ Ion Implantation and Thermal Annealing on Near-Surface Layers of Implanted GaAs
    Autorzy:
    Kulik, M.
    Surowiec, Z.
    Rzodkiewicz, W.
    Filiks, J.
    Drozdziel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402234.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    78.68.+m
    79.20.Rf
    Opis:
    The surface of semi-isolating GaAs (100) was irradiated with a fluence of 6×10¹⁷ cm¯² of the N₂⁺ ion beam; then, the samples were thermally annealed at temperatures of 500, 700, and 900°C for 2 h in an argon gas flow. The surface roughness of implanted samples was investigated with the help of atomic force microscopy. Numerous hillocks, which caused a significant increase in surface roughness, were observed. The spectroscopic ellipsometry method was used for determination of pseudo-dielectric functions of the near-surface layers in the investigated samples and the thickness of native oxides covering the irradiated surface. It was observed that the shapes of disorder spectra of the dielectric functions of near-surface layers of implanted GaAs partly returned to their original state after the thermal annealing.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 918-922
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Study of Cubic Phase in the Mn-Sb System
    Autorzy:
    Budzyński, M.
    Goncharov, V.
    Mitsiuk, V.
    Surowiec, Z.
    Tkachenka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1358695.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Np
    76.80.+y
    Opis:
    Mössbauer spectroscopy was applied to investigate the structural and magnetic parameters of cubic phase in the Mn-Sb system. The validity of the model of triangular magnetic structure in $Mn_3Sb$ has been confirmed.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 850-852
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Hyperfine Interactions in Aurivillius $Bi_{9}Ti_{3}Fe_{5}O_{27}$ Conventionally Sintered Compound
    Autorzy:
    Mazurek, M.
    Lisińska-Czekaj, A.
    Surowiec, Z.
    Jartych, E.
    Czekaj, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506653.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.20.Ev
    31.30.Gs
    76.80.+y
    Opis:
    The structure and hyperfine interactions in the $Bi_{9}Ti_{3}Fe_{5}O_{27}$ Aurivillius compound were studied using X-ray diffraction and Mössbauer spectroscopy. Samples were prepared by the conventional solid-state sintering method at various temperatures. An X-ray diffraction analysis proved that the sintered compounds formed single phases at temperature above 993 K. Mössbauer measurements have been carried out at room and liquid nitrogen temperatures. Room-temperature Mössbauer spectrum of the $Bi_{9}Ti_{3}Fe_{5}O_{27}$ compound confirmed its paramagnetic properties. However, low temperature measurements revealed the additional paramagnetic phase besides the antiferromagnetic one.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 72-74
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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