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    Wyświetlanie 1-11 z 11
    Tytuł:
    Hydrogen ordering effects in Laves - phase YFe2
    Autorzy:
    Ostrasz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147886.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hydrides
    Laves phase
    Mössbauer spectroscopy
    Opis:
    Mössbauer spectroscopy and X-ray diffraction measurements were performed before and after hydrogenation of YFe2 Laves phase in order to investigate the effect of hydrogen on their structural and magnetic properties. The experimental results show an instant change of both the lattice parameters and the hyperfine field. The results are interpreted due to the phase decomposition of the parent intermetallic in the aftermath of creation of stoichiometric hydrides YHc (c = 0.9; 2.5).
    Źródło:
    Nukleonika; 2013, 58, 1; 77-81
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine interactions in Tb0.27-xYxDy0.73Fe2 compounds at 295 K
    Autorzy:
    Krawczyk, A.
    Zwoźniak, A.
    Guzdek, P.
    Stoch, P.
    Zachariasz, P.
    Suwalski, J.
    Pszczoła, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147818.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hyperfine interaction
    intermetallics
    Laves phase
    Mössbauer effect
    Opis:
    This paper concerns the synthesis of yttrium-dilute Tb0.27-xYxDy0.73Fe2 intermetallic series with a borderline compound Tb0.27Dy0.73Fe2 known as Terfenol-D by arc melting, XRD analysis and 57Fe Mössbauer effect studies at 295 K. XRD analysis (295 K) shows that all samples crystallize in a cubic, Fd3m, MgCu2-type structure. The lattice parameter increases along with yttrium content. Mössbauer effect spectra for the Tb0.27-xYxDy0.73Fe2 series collected at 295 K consist of two subspectra due to easy direction of magnetization <111>. Hyperfine interaction parameters: isomer shift, magnetic hyperfine field and a quadrupole splitting were obtained from the fitting procedure of the spectra.
    Źródło:
    Nukleonika; 2013, 58, 1; 133-135
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Evolution and Oxidation Behavior of Fe-4Cr-6Ti Ferritic Alloy with Fe2Ti Laves Phase Precipitates
    Autorzy:
    Demirel, Ahmet
    Çetin, Emre Can
    Karakuş, Ali
    Ataş, Mehmet Şahin
    Yildirim, Mehmet
    Powiązania:
    https://bibliotekanauki.pl/articles/2125526.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ferritic alloy
    microstructure
    precipitation hardening
    laves phase
    oxidation
    Opis:
    The microstructural properties and hardness of a model ternary Fe-4Cr-6Ti ferritic alloy aged at 800°C for 8, 16 and 24 h are investigated in detail. Fine Fe2Ti Laves phase particles precipitate in the α-Fe (ferrite) matrix phase after solutionizing and subsequent aging treatments. The size and amount of Fe2Ti precipitates gradually increase with increasing aging time. The magnetic measurements of the aged samples confirm the variations in the microstructural properties including the volume fraction of the constituent phases, and Ti content of the α-Fe matrix phase. The mean Vickers microhardness value also increases from 203.5 to 238.4 with increasing aging time from 8 to 24 h. In addition, the cyclic oxidation behavior of 24 h aged sample, which contains maximum amount of Fe2Ti precipitates, is also investigated in detail. X-ray diffraction analysis reveals that scale product is α-Fe2O3 (hematite). Significant scale spallation and void formation is observed on the surfaces of 24 h aged Fe-4Cr-6Ti sample oxidized at 500°C.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 827--836
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and magnetic properties of Sc(Fe1-xCux)2 compounds studied by means of Mössbauer effect and neutron diffraction
    Autorzy:
    Wiertel, M.
    Surowiec, Z.
    Budzyński, M.
    Sarzyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147830.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hyperfine fields
    Mössbauer effect
    neutron diffraction
    quasibinary Laves phase
    Opis:
    The subject of the investigations were quasibinary Sc(Fe1-xCux)2 Laves phases in which structural and magnetic properties depend on replacement of Fe atoms by Cu atoms. Powder X-ray diffraction and neutron diffraction measurements carried out at room temperature revealed that samples were a mixture of two phases: the quasibinary Sc(Fe1-xCux)2 compounds with cubic C15 structure and ScCu2 with tetragonal structure. 57Fe Mossbauer spectroscopy revealed that the Sc(Fe1-xCux)2 compounds are ferrimagnetic up to an actual concentration xact less than 0.30. A decreasing of mean values of hyperfine magnetic fields was observed. On the basis of analysis of the neutron diffraction spectra the mean values of Fe magnetic moments were determined, considering the component connected with the quasibinary Sc(Fe1-xCux)2 phases. These moments change from 1.45(29) �ĘB in the Sc(Fe0.92Cu0.08)2 to 1.18(32)mi B in Sc(Fe0.72Cu0.28)2 phase at 8 K. From the results of independent hyperfine magnetic field on 57Fe probes and magnetic Fe moments measurements, the hyperfine coupling constant in quasibinary ferrimagnetic Sc(Fe1.xCux)2 phases is estimated as equal to 13 T/mi B at room temperature.
    Źródło:
    Nukleonika; 2013, 58, 1; 173-178
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and structural properties of Sc(Fe1−xSix)2 Laves phases studied by Mössbauer spectroscopy and neutron diffraction
    Autorzy:
    Wiertel, M.
    Surowiec, Z.
    Budzyński, M.
    Sarzyński, J.
    Beskrovnyi, A. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/147702.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    hyperfine fields
    Mössbauer effect
    neutron diffraction
    quasibinary Laves phase
    Opis:
    The investigations of iron-containing phases existing in fly ashes were performed using transmission Mössbauer spectrometry. The examined samples of fly ashes were collected from different coal combustion systems, that is, stoker-fired boiler in municipal heating plant and pulverized coal boiler in power plant. Several phases are identifi ed in the samples: iron oxides, paramagnetic aluminosilicate glass with Fe3+ ions and Al2O4- -type spinel with Fe2+ ions. It was pointed out that proportions of contents of phases strongly depend not only on the combustion temperature but also on the way of ash collection.
    Źródło:
    Nukleonika; 2015, 60, 1; 155-160
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    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:
    Hyperfine interactions in Ho(Fe1-xCox)2 compounds at 295 K
    Autorzy:
    Bednarski, M.
    Stoch, P.
    Bodnar, W.
    Zachariasz, P.
    Pszczoła, J.
    Suwalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148624.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intermetallics
    crystal structure
    Laves phase
    Mössbauer effect
    hyperfine interaction
    Slater-Pauling dependence
    Opis:
    Synthesis of Ho(Fe1–xCox)2 intermetallic compounds, studies of their crystal structure and 57Fe Mössbauer effect analysis were carried out at 295 K. X-ray measurements evidence a pure cubic Fd3m, C15, MgCu2-type Laves phase. The unit cell parameter decreases non-linearly with composition parameter x. Mössbauer effect spectra for the Ho(Fe1–xCox)2 series were composed of a number of locally originated subspectra due to random Fe/Co nearest neighbourhoods. Hyperfine interaction parameters, i.e. isomer shift, the magnetic hyperfine field and a quadrupole interaction parameter were determined from the fitting procedure of the spectra, for both the individual nearest neighbourhoods, and for the sample as bulk. As a consequence of Fe/Co substitution a Slater-Pauling type curve for the average magnetic hyperfine field vs. x is observed. The correlation between the local magnetic hyperfine fields and the average magnetic hyperfine fields is related to weak and strong ferromagnetism of the transition metal sublattice.
    Źródło:
    Nukleonika; 2010, 55, 3; 279-284
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine interactions in Tb0.27Dy0.73(Fe1–xCox)2 compounds at 77 K
    Autorzy:
    Bodnar, W.
    Szklarska-Łukasik, M.
    Stoch, P.
    Zachariasz, P.
    Pszczoła, J.
    Suwalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148142.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intermetallics
    crystal structure
    Laves phase
    Mössbauer effect
    hyperfine interaction
    Slater-Pauling dependence
    Opis:
    The synthesis of materials, crystal structure and 57Fe Mössbauer effect studies at 77 K were performed for intermetallics Tb0.27Dy0.73(Fe1–xCox)2. The starting compound Tb0.27Dy0.73Fe2 of this Fe/Co substituted series is known as Terfenol-D. XRD measurements evidence a pure cubic Laves phase C15, MgCu2-type. The determined unit cell parameter decreases across the series. Co substitution introduces a local area, in the subnanoscale, with random Fe/Co neighbourhoods of the 57Fe atoms. Mössbauer effect spectra for the Tb0.27Dy0.73(Fe1–xCox)2 series collected at 77 K consist of a number of locally originated subspectra due to random composition of Fe and Co atoms in the nearest neighbourhood. Hyperfine interaction parameters: isomer shift, magnetic hyperfine field and a quadrupole interaction parameter were obtained from the fitting procedure of the spectra, both for the local area and for the sample as bulk. As a result of Fe/Co substitution, a Slater-Pauling type curve for the average magnetic hyperfine field vs. Co content in the Tb0.27Dy0.73(Fe1–xCox)2 series is observed. It is found that the magnetic hyperfine fields corresponding to the local area sorted out against Co contribution in the Fe/Co neighbourhoods also create a dependence similar to the Slater-Pauling type curve.
    Źródło:
    Nukleonika; 2009, 54, 4; 227-232
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and magnetic investigations of Sc(Fe1-xNix)2 compounds by means of Mössbauer effect and neutron diffraction
    Autorzy:
    Wiertel, M.
    Surowiec, Z.
    Sarzyński, J.
    Budzyński, M.
    Beskrovnyi, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/148322.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer effect
    hyperfine interactions
    quasibinary Laves phase
    Sc(Fe1 xNix)2
    Opis:
    The structural and microscopic magnetic properties of the pseudobinary Sc(Fe1 xNix)2 system were studied by XRD and Mössbauer measurements in the range of 0.10 less-than or equal to - x less-than or equal to - 0.60. All investigated samples have the cubic C15-type structure. Both the magnetic hyperfine field on 57Fe and the Curie temperature decrease with increasing Ni content and the system becomes paramagnetic for x H 0.60 at room temperature. The form and temperature dependences of the Mössbauer spectra for 0.40 less-than or equal to - x less-than or equal to - 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. As follows from the near to zero values of quadrupole shifts in Mössbauer spectra it results that a <100> direction is a local easy magnetization axis for x e 0.10.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 71-75
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-Principles Calculations for Structural, Elastic, Electronic and Thermodynamic Properties of $HfZn_{2}$ under Pressure
    Autorzy:
    Li, Guo-Jun
    Shi, Lan-Ting
    Hu, Cui-E
    Cheng, Yan
    Ji, Guang-Fu
    Powiązania:
    https://bibliotekanauki.pl/articles/1398192.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    C15 Laves-phase
    elastic properties
    electronic structure
    vibrational properties
    quasi-harmonic approximation
    Opis:
    By using density functional theory within the Perdew-Burke-Ernzerhof generalized gradient approximation implemented in the VASP code, we study the structural, elastic, electronic, and thermodynamic properties of C15 Laves-phase compound $HfZn_{2}$. Comparing the lattice constants calculated from the Perdew-Burke-Ernzerhof generalized gradient approximation and local density approximation, we find that the former is in better agreement with the experimental data. The elastic constants of $HfZn_{2}$ calculated by strain-stress method indicate that they keep stable up to 100 GPa. The bonding characteristics are discussed by analyzing the energy band structure, charge density distribution and charge density difference. Phonon dispersion curves and phonon density of states of HfZn_{2} at the different pressure are predicted for the first time. In addition, there is no imaginary frequency in the phonon band at different pressure, which also shows that $HfZn_{2}$ is stable up to 100 GPa. Vibrational models are also illustrated based on phonon and group theory. The thermodynamic properties under high temperature and high pressure are calculated by different thermodynamic models. The heat capacity at constant pressure and low temperature calculated by quasi-harmonic approximation is more close to the measurement than that calculated by quasi-harmonic Debye models.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1299-1306
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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