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Wyszukujesz frazę "Hańć, A." wg kryterium: Autor


Tytuł:
Defect structure of Fe-Al and Fe-Al-X (X = Ni; Cu; Cr) metallic powders obtained by the self-decomposition method
Autorzy:
Hanc, A.
Frąckowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/147208.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
iron aluminides
defects
points defects
Mössbauer spectroscopy
Fe-Al
Opis:
In the present work, the Fe-Al-X (X = Cu; Ni; Cr) metallic powders produced by the self-decomposition method of the Fe-Al doped alloys were examined by Mössbauer spectroscopy. The concentration of the Fe vacancies and the Fe atoms substituting Al (Fe-AS) was determined from the intensities of the sub-spectra in the Mössbauer analysis connected with distinct Fe environments. The results have shown that nickel and copper cause an increase of vacancy concentrations in comparison with the values found for Fe-Al metallic powders, whereas chromium decreases vacancy concentrations causing a significant increase of anti-site atoms Fe-AS concentration.
Źródło:
Nukleonika; 2004, 49,suppl.3; 7-11
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of heat treatment on point defect concentration in Fe-Al and Fe-Al-Cr systems
Autorzy:
Kansy, J.
Hanc, A.
Giebel, D.
Powiązania:
https://bibliotekanauki.pl/articles/146336.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
positron annihilation
Fe-Al
Fe-Al-Cr
point defects
Opis:
FeAl alloys of nominal Al content 28, 38 and 45 at.% and Fe28Al5Cr with minor alloying elements added to improve their application properties are studied by positron annihilation lifetime analysis. The lifetime spectra of samples FeXAl with X greater-than or equal to 38 (both quenched and cooled with furnace) are described by a single lifetime component related to the saturated positron trapping by quenched-in vacancies of concentration much higher than 100 ppm. A very strong dependence of retained vacancy concentration on the rate of cooling is shown for Fe28Al and Fe28Al5Cr alloys. After quenching, the concentration is of the order of 10.4 whereas in samples slowly cooled it is reduced to 10.5. The chromium addition to Fe28Al5Cr dismisses the vacancies concentration in comparison to the concentration in Fe28Al after the same heat treatment.
Źródło:
Nukleonika; 2010, 55, 1; 21-25
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine Interaction Parameters in $Fe_{28}Al_{72}:$ $\text{}^{57}Fe$ Mössbauer Spectroscopy and Ab Initio Study
Autorzy:
Hanc, A.
Deniszczyk, J.
Kansy, J.
Powiązania:
https://bibliotekanauki.pl/articles/1427489.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
61.05.Qr
71.20.-b
Opis:
The paper discusses a theoretical model that associates the shape of the Mössbauer spectrum with the configuration of atoms in local surroundings of the Mössbauer nuclide. Using the model we analyse the Mössbauer spectra of $Fe_{72}Al_{28}$ alloys after various heat treatments. Basing on the model calculations the hyperfine structure parameters describing an effect of an Al atom in the first and the second coordination shell of $\text{}^{57}Fe$ atom are evaluated. Using these parameters the values of hyperfine magnetic field and isomers shift for the atomic configurations present in stoichiometric $Fe_3Al$ are estimated and compared with the results of ab initio calculations.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1154-1155
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Mössbauer Spectroscopy Studies οf Cementite Precipitations during Continuous Heating from As-Quenched State of High Carbon Cr-Mn-Mo Steel
Autorzy:
Krawczyk, J.
Bała, P.
Hanc, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811613.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
31.30.Gs
75.50.Bb
Opis:
This work complements the knowledge concerning the kinetics of cementite precipitation during tempering. Investigations were performed on 120MnCrMoV8-6-4-2 steel. The samples of investigated steel were austenitized at the temperature of 900°C and quenched in oil. Then four of five samples were tempered. Tempering consisted of heating the samples up to chosen temperatures at the heating rate of 0.05°C/s and fast cooling after reaching desired temperature. This work presents the results of investigations performed carried out using the Mössbauer spectroscopy technique and their interpretation concerning cementite nucleation and growth during tempering. The values of hyperfine magnetic field on $\text{}^{57}Fe$ atomic nuclei, determined for the third component of the Mössbauer spectrum as regards to its intensity, indicate that these are the components coming from ferromagnetic carbides. Big differences in hyperfine magnetic fields coming from Fe atoms existing in the structure of carbides, measured on samples heated up to the temperatures of 80°C and 210°C, in comparison with values for $\text{}^{57}Fe$ atoms precipitated from carbides during heating up to the temperature of 350°C and 470°C, allow to state that these are the carbides of different crystal structure. The influence of hardened steel heating temperature on cementite precipitation was determined. The Mössbauer spectroscopy was applied not only for magnetic hyperfine fileld studies, but also to analyze the values of quadrupole splitting and isomeric shift, which resulted in significant conclusions concerning the changes in cementite precipitations morphology, chemical composition and the level of stresses being present in this research.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1651-1657
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Heat Treatment on Ordering Process in $Fe_{72}Al_{28}$ Alloy Studied by Mössbauer Spectroscopy
Autorzy:
Kansy, J.
Hanc, A.
Giebel, D.
Powiązania:
https://bibliotekanauki.pl/articles/1506590.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.30.Hd
76.80.+y
Opis:
The paper discusses a theoretical model that associates the shape of Mössbauer spectrum with the configuration of atoms in local surroundings of the Mössbauer nuclide. The model has been implemented to a computer program which was used to analyse the Mössbauer spectra of $Fe_{72}Al_{28}$ alloys after various heat treatments. Basing on the determined configuration of atoms, the long range ordering parameter was estimated.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 44-47
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Mössbauer Spectroscopy Studies of ϵ to Cementite Carbides Transformation during Isothermal Heating from As-Quenched State οf High Carbon Tool Steel
Autorzy:
Bała, P.
Krawczyk, J.
Hanc, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811611.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
31.30.Gs
75.50.Bb
Opis:
This work presents results of investigations using the Mössbauer spectroscopy technique and their interpretation concerning transformation of ϵ to cementite carbides during tempering in relation to the previously conducted dilatometric, microscopic and mechanical investigations. Investigations were performed on 120MnCrMoV8-6-4-2 steel. The influence of the tempering time on nucleation and solubility of ϵ carbides, and on cementite nucleation and growth, was determined. The analysis of phase transformations during various periods of tempering using the Mössbauer spectroscopy technique made possible to reveal fine details connected with the processes.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1641-1650
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Point defects in the B2 - phase region of the Fe-Al system studied by Mössbauer spectroscopy and X-ray diffraction
Autorzy:
Hanc-Kuczkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/147904.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
iron aluminides
Mössbauer spectroscopy
point defects
X-ray diffraction
Opis:
In this work Mössbauer spectroscopy and X-ray powder diffraction was used to study of point defects 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 defects determined from positron annihilation data. The values of the 57Fe isomer shift and quadrupole splitting for the components describing the point defects in the local environment of a Mössbauer nuclide are presented. The concentration of the Fe vacancies and Fe atoms substituting Al (i.e. anti-site atom, Fe-AS) are determined. The results show that an increase in Al content causes an increase in vacancy and Fe-AS concentrations.
Źródło:
Nukleonika; 2013, 58, 1; 123-126
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer temperature study of the Fe80Nb6B14 amorphous alloy
Autorzy:
Frąckowiak, J.
Tomczyk, A.
Hanc, A.
Haneczok, G.
Powiązania:
https://bibliotekanauki.pl/articles/148205.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
amorphous alloys
magnetic properties
structural relaxation
Opis:
Temperature studies in the range 300 800 K of amorphous Fe80Nb6B14 alloy using Mössbauer spectroscopy are presented. It is shown that at a temperature close to 700 K iron clusters with non-collinear magnetic structure are formed. The observed magnetic permeability enhancement effect in the annealed at elevated temperatures alloy, which takes place in amorphous phase, is due to the strong ferromagnetic exchange between Fe clusters via the amorphous matrix and reduction of internal stresses.
Źródło:
Nukleonika; 2007, 52, supl. 1; 43-46
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab Initio Study of the $\text{}^{57}Fe$ Electric Field Gradient in $(FeAl)_{1-x}T_x$ (T = 3d Element) Dilute Alloys with B2-Type Structure
Autorzy:
Michalecki, T.
Hanc, A.
Deniszczyk, J.
Borgieł, W.
Powiązania:
https://bibliotekanauki.pl/articles/1811576.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.20.Lp
75.50.Bb
76.80.+y
Opis:
We present an ab initio study of the electric field gradient at Fe nuclei in the series of $(FeAl)_{1-x}T_x$ dilute alloys with B2-type crystal structure. The ternary additions T, of concentration x ≈ 0.06, from the group of 3d-type transition metals (Ti, V, Cr, Mn, Co, Ni, Cu) are considered. Lattice, local valence electron (3d, 4p) and weakly bound 3p core electron contributions to electric field gradient are separated out and discussed in the context of the T-atom site preference and changes of the electronic structure upon alloying. Contrary to earlier reports, we found that for most Fe nuclei the dominant contribution comes from the d-type valence electrons cancelled partially by the 3p and 4p electric field gradients which are both of opposite sign to that of the 3d one. The shielding effect of 3p semicore electrons is found and related to the electric field gradient contributed by the local valence electrons.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1483-1491
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:
Vacancy Formation in Fe-Al of B2 and $DO_3$ Alloys
Autorzy:
Kansy, J.
Hanc, A.
Giebel, D.
Jabłońska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812532.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.55.Ak
Opis:
The positron lifetime spectroscopy is employed to study vacancy formation in intermetallic phases of $DO_3$ and B2 structures from Fe-Al system as a function of Al concentration, ternary additive (Cr) and their thermal treatment. Lifetime spectra were fitted en block by a simple trapping model encoded directly to the software (computer program LT-9). In the investigated range of Al concentration (28, 38, 42, and 45 at%) only two types of defects are found. In $DO_3$ region a single type of defects (characterized by positron lifetime $τ_1$=170±2 ps) is detected and indicated as vacancies in the Fe sublattice $(V_{Fe})$. In B2 region a small amount of an additional type of defects (characterized by positron lifetime $τ_2$=214±13 ps) appears. Supposedly, these are vacancies in Al sublattice $(V_{Al})$. For Fe28Al and Fe28Al5Cr samples changes in $V_{Fe}$ concentration are determined as a function of the sample composition, annealing time at 1000°C and quenching the samples to air and oil. The defect concentration increases with increase in Al content. For FeAl with Al above 38 at%, the total concentration of defects is so high that positrons are exclusively trapped by defects. Therefore the concentrations $V_{Al}$ and $V_{Fe}$ cannot be determined separately. However, the ratio of $V_{Al}$ concentration to $V_{Fe}$ concentration is estimated as a function of Al content.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1409-1415
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behaviour of Cd, Cr, Cu, Pb, and Zn in Fluvisol and Cambisol Fertilized with Composts
Zachowanie Cd, Cr, Cu, Pb i Zn w glebach napływowej i brunatnej nawożonych kompostami
Autorzy:
Hanč, A.
Tlustoš, P.
Balík, J.
Száková, J.
Powiązania:
https://bibliotekanauki.pl/articles/388761.pdf
Data publikacji:
2009
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
metale ciężkie
kompost
gleba
przyswajalność
heavy metals
compost
soil
availability
Opis:
Risk elements contents play important role in compost quality determination. The aim of the work was to evaluate main risk elements availability in two soils with various parameters after composts application. The changes of risk elements mobility in soils fertilized with composts differed in dependence on soil parameters (risk elements contamination of soil, clay particles content, organic matter content and pH value) and on used extraction agent. Cadmium, zinc and partly chromium extracted in 0.01 mol o dm^-3 CaCl2 solution were immobilized and lead was released to soil solution of both soils. The remediation ability of composts in cadmium and lead contaminated soil was found only for cadmium.
Zawartość pierwiastków szkodliwych odgrywa ważną rolę w wyznaczaniu jakości kompostu. Celem badań była ocena przyswajalności głównych pierwiastków szkodliwych w dwóch glebach o różnych parametrach po zastosowaniu kompostów. Zmiany mobilności tych pierwiastków w glebach nawożonych kompostami różniły się w zależności od właściwości gleby (zanieczyszczenia gleb pierwiastkami szkodliwymi, zawartości frakcji iłu, zawartości materii organicznej i wartości pH) i od użytego odczynnika ekstrakcyjnego. Kadm, cynk i częściowo chrom ekstrahowane roztworem 0,01 mol CaCl2 o dm^-3 były unieruchamiane, a ołów był uwalniany do roztworu glebowego obydwu gleb. Zdolność remediacyjną kompostu w glebach zanieczyszczonych kadmem i ołowiem stwierdzono tylko w przypadku kadmu.
Źródło:
Ecological Chemistry and Engineering. A; 2009, 16, 5/6; 567-573
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accumulation and translocation heavy metals in hyperaccumulating plants (Brassica juncea v. Malopolska) exposed to Pb, Cu, Cd and Zn
Autorzy:
Malecka, A.
Piechalak, A.
Kutrowska, A.
Hanc, A.
Baralkiewicz, D.
Tomaszewska, B.
Powiązania:
https://bibliotekanauki.pl/articles/80141.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
heavy metal
translocation
accumulation
hyperaccumulation
Brassica juncea
phytoremediation
phytotoxic damage
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral constituents of conserved white button mushrooms: similarities and differences
Autorzy:
Pankavec, S.
Hanc, A.
Baralkiewicz, D.
Dryzalowska, A.
Zhang, J.
Falandysz, J.
Powiązania:
https://bibliotekanauki.pl/articles/876885.pdf
Data publikacji:
2019
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. Mushrooms are a food that is often considered as an important source of minerals and other nutrients for consumers. There is little data on the minerals in mushrooms processed culinary and on the impact of processing. Objective. The research was aimed at understanding the similarities and differences in the mineral composition (Hg, Li, Mg, Al, Co, Ni, Cu, As, Se, Rb, Sr, Ag, Cd, Cs, Sb, Tl, Pb, U, Ba, Cr, Zn, Mn and V) of white button mushrooms (Agaricus bisporus) processed in industrial conditions. Material and methods. Fungal materials came from six producers. The elements were determined by ICP-MS DRC and CV-AAS using validated methods and QA/QC protocol. The interdependencies of 18 elements and 10 batches of mushrooms examined were tested with the help of principal component analysis. Results. Some significant differences were found in the content and composition of minerals in marinated white button mushrooms depending on producer. Conserved white button mushrooms are poorer in major essential elements but also in toxic Hg, As, Ag, Cd, Sb, Tl or Pb which has been reported for unprocessed mushrooms. Conclusions. The relatively higher levels of Ag in some batches seem to be largely explained by the quality of the substrate used for mushrooms cultivation, while of Li, Rb, Cs, Cr, Al, U, V, As and Mn (in part also of Ba and Sr) largely by the quality of the marinade.
Wprowadzenie. Grzyby jadalne to surowiec spożywczy bogaty w niezbędne pierwiastki metaliczne ale też możliwie źródło narażenia konsumenta na toksyczne metale i metaloidy. Niewiele jest danych na ten temat odnośnie grzybów przetworzonych kulinarnie czy wpływu procesów przetwarzania. Cel. Badania miały na celu poznanie podobieństw i różnic w składzie mineralnym (Hg, Li, Mg, Al, Co, Ni, Cu, As, Se, Rb, Sr, Ag, Cd, Cs, Sb, Tl, Pb, U, Ba, Cr, Zn, Mn and V) pieczarek (Agaricus bisporus) przetworzonych w warunkach przemysłowych. Materiał i metody. Pieczarki pochodziły z sześciu przetwórni. W analizie zastosowano sprawdzone metodyki analityczne łącznie z bieżącą kontrolą i zapewnieniem jakości wyników analizy. Pomiar wykonano technikami ICP-MS-DRC i CV-AAS. Współzależności pomiędzy 18 pierwiastkami i 10 partiami grzybów badano metodą analizy głównych składowych. Wyniki. Wykazano duże różnice w zawartości składników mineralnych w pieczarkach z różnych przetwórni. Konserwowe pieczarki są znacznie uboższe w główne pierwiastki niezbędne ale także w pierwiastki toksyczne takie jak Hg, As, Ag, Cd, Sb, Tl czy Pb w porównaniu z opublikowanymi danymi dla grzybów nieprzetworzonych. Wnioski. Względnie większą zawartość Ag w określonych partiach badanych konserwowych pieczarek wydaje się tłumaczyć jakość podłoża zastosowanego w uprawie grzybów a w przypadku Li, Rb, Cs. Cr, Al, U, V, As i Mn (po części też Ba i Sr) główny wpływ wydaje się mieć jakość użytej zalewy (marynaty).
Źródło:
Roczniki Państwowego Zakładu Higieny; 2019, 70, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
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

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