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    Wyświetlanie 1-5 z 5
    Tytuł:
    Mössbauer study of the Heusler-type Fe2MAl compounds for M = V, Cr, Fe, Co, Ni
    Autorzy:
    Popiel, E.
    Zarek, W.
    Tuszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147224.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Heusler alloys
    Mössbauer spectroscopy
    site preference
    magnetostatic measurements
    Opis:
    The crystal structure and magnetic properties of Fe2MAl compounds for M = V, Cr, Fe, Co and Ni were investigated by X-ray, magnetostatic and Mössbauer effect methods. It was found that the investigated compounds possess not perfectly ordered fcc structure of the L21-type. With increasing number of 3d electrons of M component the transition from the paramagnetic to ferromagnetic behaviour follows. Mössbauer spectra were analysed by a hyperfine field distribution method. They are characterictic of the ferromagnetic phase for M = Fe, Co and Ni and indicated the early observed preference of these atoms for the Fe sites.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 49-52
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal order and magnetic properties of Fe2.4V0.6Al alloy studied by magnetostatic and Mössbauer methods
    Autorzy:
    Popiel, E.
    Zarek, W.
    Kapuśniak, Z.
    Tuszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148801.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    magnetic clusters
    Mössbauer spectroscopy
    relaxation time
    Opis:
    Performed investigations showed that the magnetic properties of the Fe2.4V0.6Al alloy markedly depend on the degree of atomic order of its cubic structure. The atomically disordered alloy with A2 (bcc) type structure exhibits ferromagnetic properties. Its Mössbauer spectra can be described by the hyperfine field distribution connected with various local environments of Fe atoms. Alloys with B2 (sc) and DO3 (fcc) type structure do not exhibit magnetic transition above 4.2 K. High values of the magnetization and its strongly non-linear variation with magnetic field intensity in a wide temperature range suggest the presence of magnetic iron clusters in these alloys. Superparamagnetic relaxation times of the order of 10-9 s and 5 × 10-8 s correspond to the largest magnetic clusters with a magnetic moment of 4 × 103 žB in B2 and 104 žB in DO3-type structure, respectively. Mössbauer spectra of these alloys confirm lack of the magnetic order and also suggest the presence of the Fe magnetic clusters with those relaxation times. It was shown that the increase of atomic order of the crystal structure causes formation of the Fe magnetic clusters and disappearing of the magnetic order.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 65-70
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer study of the El Hammami olivine-bronzite meteorite
    Autorzy:
    Zarek, W.
    Popiel, E.
    Tuszyński, M.
    Teper, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/147220.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    meteorite
    XRD
    scanning electron microscopy
    Mössbauer spectroscopy
    kamacite
    Opis:
    The phase composition of the El Hammami meteorite was investigated by X-ray, magnetostatic, Mössbauer effect and environmental scanning electron microscopy methods. Performed investigations indicated that this meteorite consists of aluminosilicates, olivine (Mg,Fe)2SiO4, pyroxene (Ca,Mg,Fe)SiO3, kamacite (bcc Fe-Ni alloy) and troilite (FeS). Some inclusions of Ti and Cr were observed by scanning electron microscopy. The concentration of Ni in kamacite was determined by comparison of the Mössabauer spectra of Fe-Ni phase in the meteorite with those for synthetic bcc Fe-Ni alloys (5, 10, 25% Ni).
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 59-62
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Crystal Structure and Magnetic Properties οf Selected fcc FeNi and $Fe_{40}Ni_{40}B_{20}$ Alloys
    Autorzy:
    Kądziołka-Gaweł, M.
    Zarek, W.
    Popiel, E.
    Chrobak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539142.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ga
    82.80.Ej
    Opis:
    The crystal structure and magnetic properties of polycrystalline alloys $Fe_{62.5}Ni_{37.5},$ $Fe_{60}Ni_{40},$ $Fe_{50}Ni_{50}$ obtained by arc-melting and $Fe_{40}Ni_{40}B_{20}$ alloy obtained by melt spinning technique were investigated by X-ray, magnetostatic and Mössbauer effect methods. The X-ray measurements show that $Fe_{40}Ni_{40}B_{20}$ alloy has a face-centered structure (fcc) which means that boron did not cause an amorphous rendering. The lattice constants for this alloy (a = 3.53 Å) is smaller than for FeNi alloys (a > 3.57 Å) which suggests that boron atoms were built-in in the crystal lattice. The Curie temperature of this alloy is more than 150 K higher in comparison with the of FeNi alloys, but the magnetic moment connected with this alloy is more than 0.17 $μ_{B}$/atom smaller than the magnetic moments of FeNi alloys. The shape of hyperfine field distribution for $Fe_{40}Ni_{40}B_{20}$ is similar to the shape of hyperfine field distribution for the investigated fcc $Fe_{62.5}Ni_{37.5}$ alloy, but both are different from another investigated hyperfine field distribution of FeNi alloys.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 412-414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Investigations and Photoemission Studies of the Fe 3s Spin Splitting in Some Fe-Ni Alloys
    Autorzy:
    Kądziołka-Gaweł, M.
    Zarek, W.
    Talik, E.
    Popiel, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811577.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Ej
    82.80.Pv
    Opis:
    The magnetic properties, crystal and electronic structure for $Fe_{1-x}Ni_x$ (x=0.30, 0.325, 0.375) alloys and austenitic steel were studied using magnetostatic, Mössbauer effect methods, X-ray diffraction and X-ray photoelectron spectroscopy. The compositions of the investigated Fe-Ni alloys were chosen like that to exist on left, right and in inside of invar range. Two different magnetic moments (low and high) of Fe atom were observed. Measurement results do not show antiferromagnetic order in Fe-Ni alloys.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1493-1500
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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