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    Wyświetlanie 1-9 z 9
    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:
    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:
    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 the substitution of Ti for Y on structural properties and hyperfine interactions in Y1-xTixFe2 compounds
    Autorzy:
    Surowiec, Z.
    Sarzyński, J.
    Budzyński, M.
    Wiertel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971534.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hyperfine interactions
    Mössbauer effect
    quasibinary Laves phase
    Y1 xTixFe2
    Opis:
    Abstract Room temperature 57Fe Mössbauer spectroscopy and X-ray diffraction measurements are reported for a series of Y1 xTixFe2 polycrystalline samples. Our research shows that except for x = 0 and x = 1, the samples are a mixture of two C15 and C14 pseudobinary Laves phases. Some Ti atoms occupy the crystallographic positions 8a characteristic of the Y atoms in the cubic C15 structure while the rest of them form the hexagonal C14 phase. However, the lattice constant dependencies on concentration x suggest the occurrence of Y atoms in the positions 4f characteristic of Ti atoms in the hexagonal C14 structure. The partial substitution of Ti atoms for Y atoms is responsible for the HMF changes in the cubic phase. Contrary to the situation taking place in the Zr1 xTixFe2 compounds, magnetic arrangement in the pseudobinary hexagonal phases is not observed at room temperature.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 17-21
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Sc substitution for Y on structural properties and hyperfine interactions in Y1-xScxFe2 compounds
    Autorzy:
    Budzyński, M.
    Sarzyński, J.
    Wiertel, M.
    Surowiec, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/148816.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hyperfine interactions
    Mössbauer effect
    quasibinary Laves phase
    Y1-xScxFe2
    Opis:
    Measurements of X-ray diffraction and Mössbauer effect were made on a series of Y1-xScxFe2 polycrystalline samples (x = 0.0, 0.2, 0.5, 0.7, 0.8, 1.0). It was found that the system has the cubic MgCu2 structure except for x = 1.0 where hexagonal MgZn2 structure type is stable. The lattice constant decreases with increasing x. The results of Mössbauer effect study at room temperature show that the easy axes of magnetization remain in the <111> direction for the cubic samples and <100> for the hexagonal one. Curie temperatures TC were determined from temperature dependence of the hyperfine magnetic fields. The concentration dependence of the hyperfine fields and TC show similar trends, exhibiting a maximum at x = 0.8. The magnetic and structural behaviour show that, in spite of being isoelectronic, the substitution of Y by Sc induces clear changes in the structural and magnetic properties of the compounds under investigation.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 79-83
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    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:
    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
    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:
    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
      Wyświetlanie 1-9 z 9

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