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    Wyświetlanie 1-5 z 5
    Tytuł:
    Magnetocaloric Properties of Fe₇₅Mo₈Cu₁B₁₆ and Fe₈₁Mo₈Cu₁B₁₀ Metallic Glasses
    Autorzy:
    Hasiak, M.
    Miglierini, M.
    Kaleta, J.
    Bujdoš, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387599.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    71.23.Cq
    76.80.+y
    87.64.Pj
    Opis:
    Microstructure and thermomagnetic properties for the Fe₇₅Mo₈Cu₁B₁₆ and Fe₈₁Mo₈Cu₁B₁₀ metallic glasses in the as-quenched state and after heat treatment at 643 K and 723 K are studied. The inverse change of the Curie point was observed for Fe₇₅Mo₈Cu₁B₁₆ metallic glass after annealing below the onset of crystallization. It is attributed to structural relaxation of the amorphous phase. The maximum of magnetic entropy change calculated for magnetic field of 1.0 T occurs for the Fe₇₅Mo₈Cu₁B₁₆ alloy annealed at 643 K at temperature close to the Curie point and equals 0.74 J kg¯¹ K¯¹.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 608-610
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Ion Irradiated Fe₇₅Mo₈Cu₁B₁₆ Metallic Glass
    Autorzy:
    Hasiak, M.
    Miglierini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032745.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.30.Sg
    76.80.+y
    Opis:
    Microstructure and thermomagnetic properties of ion-bombarded amorphous Fe₇₅Mo₈Cu₁B₁₆ alloy are investigated. The Mössbauer spectroscopy shows that surface regions at the air side of the ribbons irradiated with 2×10¹⁶ ions/cm² were significantly affected by 130 keV N⁺ ions. On the other hand, the opposite (wheel) side that was not exposed to ion irradiation is practically intact. The analysis of temperature dependences of magnetization shows the Curie points of 313 K and 316 K for as-quenched and irradiated samples, respectively. The maximum of magnetic entropy change calculated for the irradiated alloy in a magnetic field of 1.0 T occurs at 312.5 K and equals to 0.77 J kg¯¹ K¯¹ while that of the as-quenched sample is 0.74 J kg¯¹ K¯¹.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 768-770
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Ion-Irradiation upon Microstructure and Magnetic Properties of NANOPERM-Type Fe₈₁Mo₈Cu₁B₁₀ Metallic Glass
    Autorzy:
    Hasiak, M.
    Miglierini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030756.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.60.Ej
    75.30.Kz
    61.80.-x
    76.80.+y
    Opis:
    Microstructure and soft magnetic properties of the Fe₈₁Mo₈Cu₁B₁₀ amorphous alloy in the as-quenched state and after irradiation with N⁺ ions are investigated. CEMS spectra show that the irradiated surface at the air side of the ribbons was significantly affected. On the other hand, no noticeable changes were observed at the opposite wheel side. More deep subsurface regions are also not altered as evidenced by CXMS spectra. Thermomagnetic measurements have shown presence of two magnetically different phases with well distinguished Curie points. They can be ascribed to the amorphous matrix and crystalline phases. The latter were quenched-in during the production process and/or induced by ion bombardment. Curie temperatures of the amorphous matrixes were calculated using the Heisenberg model. For the as-quenched and irradiated ribbons they are of 223 K and 228 K, respectively. The behaviour of coercivity versus temperature was also analysed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 680-683
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Cobalt Substitution on Hyperfine Interactions in $(Fe_{1-x}Co_x)_{76}Mo_8Cu_1B_{15}$ Alloys
    Autorzy:
    Kaňčuch, T.
    Miglierini, M.
    Lancok, A.
    Švec, P.
    Illeková, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813526.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    75.75.+a
    76.80.+y
    Opis:
    The effect of cobalt substitution on structure, magnetic behaviour, magnetic arrangement, and hyperfine interactions in $(Fe_{1-x}Co_x)_{76}Mo_8Cu_1B_{15}$ (x = 0, 0.1, 0.2, 0.25, 0.5) is studied by the Mössbauer spectrometry for both as-quenched and annealed alloys. Partial substitution of Fe by Co resulted in an enhancement of the average value of hyperfine magnetic field distributions as a function of x probably due to higher magnetic moment of Co. After annealing, a two-phase nanocrystalline structure composed of amorphous matrix and bcc-FeCo nanocrystallites was observed. Mössbauer spectra were fitted with up to four six-line patterns of narrow lines assigned to different number of Co nearest neighbours inside a bcc-FeCo lattice.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 63-66
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature behaviour of hyperfine magnetic fields in a Fe-Co-Si-B-Mo-P metallic glass followed with ⁵⁷Fe Mössbauer spectrometry
    Autorzy:
    Cesnek, M.
    Miglierini, M.
    Kmječ, T.
    Kohout, T.
    Amini, N.
    Janičkovič, D.
    Matúš, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1053048.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.75.-c
    76.80.+y
    Opis:
    Amorphous glass with nominal chemical composition Fe₅₁Co₁₂Si₁₆B₈Mo₅P₈ was studied by combination of the Mössbauer spectroscopy and magnetic measurements in order to characterize magnetic and structural features. Temperature evolution of the Mössbauer spectra revealed presence of broad distribution of hyperfine magnetic field at lower temperatures which vanishes with increase of temperature. The Curie temperature estimated from the Mössbauer spectroscopy experiments is T_{C} ≈ 392 K. This value is in a good agreement with that obtained by magnetic measurements (T_{C}=397 K). The Mössbauer spectroscopy spectra of the sample annealed at 823 K revealed a presence of crystalline components. This temperature is notably lower than the expected temperature of the onset of crystallization observed by differential scanning calorimetry ( ≈ 835 K).
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 744-746
    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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