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    Wyświetlanie 1-9 z 9
    Tytuł:
    Mössbauer Study of Some Intermetallic Compounds $Fe_{80-x}Ni_{x}B₂₀$ (x=8, 16, 24, 28)
    Autorzy:
    Kądziołka-Gaweł, M.
    Babilas, R.
    Granek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1397030.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    81.07.Bc
    33.50.+x
    Opis:
    Fe-based nanocrystalline alloys were prepared by the melt-spinning technique and characterized by X-ray diffraction, magnetostatic and Mössbauer effect methods. The Mössbauer spectroscopy allows to study the local environment of the Fe atoms in the investigated $Fe_{80-x}Ni_{x}B₂₀$ (x=8, 16, 24, 28) compounds and showing the changes in the structure due to the changing of Ni addition. Combination of X-ray diffraction and Mössbauer spectroscopy results confirm formation of different number of phase complex, including the α-FeNi, γ-FeNi, FeB, Fe₂B, Fe₃B in the investigated materials together with increase of Ni content.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 651-653
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Crystal and Magnetic Properties of Some Fe-Nb-B-Ni Alloys
    Autorzy:
    Kądziołka-Gaweł, M.
    Chrobak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387186.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    81.07.Bc
    33.50.+x
    Opis:
    The crystal and magnetic properties of $(Fe₈₀Nb₆B₁₄)_{1-x}Niₓ$ (x = 0.1, 0.2 and 0.4) bulk alloys prepared by making use of mould casting technique have been studied by X-ray diffraction, magnetostatic and Mössbauer effect methods. Structural and magnetic properties of investigated bulk alloys have been compared with polycrystalline $Fe_{1-x}Niₓ$ (x = 0.1, 0.2 and 0.4) alloys. The measurements have shown that the crystal and magnetic nonhomogeneity for bulk alloys are higher than in polycrystalline compounds, which confirms many magnetic wide magnetic hyperfine field distribution. The mean diameters of crystallites for $(Fe₈₀Nb₆B₁₄)_{1-x}Niₓ$ alloys was calculated from X-ray line broadening and were bigger than 10 nm. The mean magnetic moment and average magnetic hyperfine fields decrease with increase of nickel concentration in investigated compounds.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 567-569
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave-Assisted Synthesis of $CeVO_4$ in the Mild Conditions, Characterization and Investigation of Luminescent Properties
    Autorzy:
    Çelik, G.
    Kurtuluş, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218871.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.40.-x
    33.50.Dq
    61.05.cp
    82.33.Pt
    Opis:
    $CeVO_4$ (ICDD: 12-757) was synthesized by microwave-assisted method by using cerium sulphate and vanadium (V) oxide in an appropriate molar ratio. Characterizations were done by X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet spectrophotometry and thermogravimetric/differential thermal analysis. The material is crystallized in tetragonal system with unit cell parameters a = 7.399 Å and c = 6.496 Å and space group I41/amd(141).
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 357-358
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation Damage of Fe-based Nanocrystalline Materials
    Autorzy:
    Sitek, J.
    Dekan, J.
    Pavlovič, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367064.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.46.+w
    75.50.Kj
    Opis:
    Nanocrystalline $(Fe_{1-x}Ni_{x})_{81}Nb_{7}B_{12}$ (x=0, 0.25, 0.5, 0.75) and Vitroperm alloys were studied by Mössbauer spectroscopy after neutron irradiation at fluences of $10^{16} n$/$cm^{2}$ and $10^{17} n$/$cm^{2}$. From structure analyses, we have identified ferromagnetic bcc-FeNi in nanocrystalline state and partly paramagnetic $(Fe-Ni)_{23}B_{6}$ phase. Neutron irradiation had an influence on the magnetic microstructure, which is manifested in the change of the Mössbauer parameters, such as the direction of net magnetic moment, the intensity of internal magnetic field and the volumetric fraction. The results indicate that the changes of the microscopic magnetic parameters, induced by neutron irradiation, depend on iron and nickel content. Significant radiation damage started at neutron fluence of $10^{17} n$/$cm^{2}$.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 84-85
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Nanocrystalline Alloys after Electrons Irradiation
    Autorzy:
    Sitek, J.
    Holková, D.
    Dekan, J.
    Novák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030257.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.46.-w
    75.50.Kj
    Opis:
    Nanocrystalline (Fe₃Ni₁)₈₁Nb₇B₁₂ alloy was irradiated by electron beams of doses up to 4 MGy. Irradiation had an influence on the magnetic microstructure of the studied alloys. It has manifested as a change in the mean orientation of local magnetization, intensity of the internal magnetic field, and distribution function of induction of internal magnetic field. All these parameters were determined from the measured Mössbauer spectra. The mean orientation of local magnetization was the most sensitive parameter. Structural changes were not identified by the Mössbauer spectroscopy and by X-ray diffraction. The results indicated that the changes of the microscopic magnetic parameters induced by irradiation depend on the phase composition. Intensity of internal magnetic field also contributes to resistivity of alloy against radiation.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 708-710
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fe-Based Nanocrystals in Weak External Magnetic Field
    Autorzy:
    Sitek, J.
    Degmová, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1507129.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.46.-w
    75.50.Kj
    Opis:
    Nanocrystalline alloys of $Fe_{86.5}Zr_{6.5}Cu_1B_6$ and $Fe_{40.5}Co_{40.5}Nb_7B_{12}$ were measured by the Mössbauer spectrometry in the weak external magnetic field of 0.5 T. In these conditions the most sensitive parameters of the Mössbauer spectra are the intensities of 2nd and 5th lines and the values of internal magnetic field showed rather small changes. The amorphous part of the sample is more sensitive to the external influence than the nanocrystalline one. The behavior of nanocrystalline alloys under weak external magnetic field was analyzed within influence of interparticles interactions on the magnetic parameters.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 773-774
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Magnetic and Structural Properties of Sr Ferrite Prepared by Low-Temperature Combustion
    Autorzy:
    Grusková, A.
    Jančárik, V.
    Sláma, J.
    Ušáková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813884.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.50.Ww
    74.25.Ha
    33.45.+x
    Opis:
    Fine strontium hexaferrite particles were prepared by the low temperature auto-combustion method. Aqueous solution of the corresponding metal salts and a combustible co-reactant compound - glycine were used as initial precursor. The resulting powders were calcined at various temperatures from 750°C up to 1100°C. The microstructure and magnetic properties were investigated by the Mössbauer spectroscopy, thermomagnetic analysis, scanning electron microscopy, and vibrating magnetometer. The particles of sizes less than 1 μm have monophasic hexagonal structure. Coercivity $H_c$≈400 kA/m, specific saturation polarization $J_{s-m} ≈ 72×10^{-6} Tm^3 kg^{-1}$ and remanence polarization $J_{s-r} ≈ 43×10^{-6} T m^3 kg^{-1}$ were achieved for the Sr ferrite annealed at 850°C for 6 h.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 557-560
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and magnetic properties of Fe-B-Si-Zr metallic glasses
    Autorzy:
    Babilas, R.
    Radoń, A.
    Gębara, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054824.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.05.cp
    64.70.pe
    75.50.Kj
    Opis:
    Fe-based amorphous alloys were characterized by X-ray diffraction, transmission Mössbauer spectroscopy and vibrating sample magnetometry. The studies were performed on (Fe_{0.75}B_{0.15}Si_{0.1})_{100-x}Zr_{x} (x=0, 1, 3) metallic glasses in the form of ribbons. The glassy samples were prepared by the "melt spinning" technique in argon protective atmosphere. The XRD patterns show the broad diffraction halo that is typical for amorphous Fe-based alloys. The Mössbauer spectroscopy allows to study the local environments of the Fe atoms in the glassy state, showing the changes in the amorphous structure due to the changing of Zr addition. From hysteresis loops obtained from vibrating sample magnetometry measurements, coercive force and saturation magnetization were determined versus different Zr content. The obtained magnetic properties allow to classify the studied amorphous alloys in as-cast state as soft magnetic materials.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 726-728
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and Structure after Crystallization of $Fe_{80-x}B_{20}Nb_{x}$ (x=4, 6, 10) Metallic Glasses
    Autorzy:
    Nowosielski, R.
    Kądziołka-Gaweł, M.
    Gębara, P.
    Szyba, D.
    Babilas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398320.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.05.cp
    64.70.pe
    75.50.Kj
    Opis:
    The ferromagnetic Fe-based amorphous alloys were studied due to properties for soft magnetic applications. Depending on different Nb addition, the formation of crystalline phases after annealing of amorphous $Fe_{80-x}B_{20}Nb_{x}$ (x = 4,6,10) alloys was studied. The crystallization products as well as the phase structure were determined using the Mössbauer spectrometry combined with differential scanning calorimetry and magnetic measurements. The addition of Nb caused a shift of crystallization process towards higher temperatures and induced changes in coercive force and decreased the saturation magnetization. It was found that Nb addition changed the crystallization process from single crystallization for Fe₇₆B₂₀Nb₄ alloy to binary crystallization in the Fe₇₄B₂₀Nb₆ and Fe₇₀B₂₀Nb₁₀ glasses. The annealing process at the onset crystallization temperature induced complex phase formation including the α-Fe, Fe₃B, and Fe₂B phases for alloys x=4, 6.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1212-1216
    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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