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    Wyświetlanie 1-4 z 4
    Tytuł:
    Magnetocaloric effect in amorphous and partially crystallized Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ alloy
    Autorzy:
    Łukiewska, A.
    Olszewski, J.
    Hasiak, M.
    Gębara, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1047599.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    75.50.Kj
    75.50.Bb
    75.30.Sg
    Opis:
    In the present work the microstructure and thermomagnetic properties of Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ ribbon in the as-quenched state and after the accumulative annealing in the temperature range 600-800 K for 10 min were studied using Mössbauer spectroscopy and vibrating sample magnetometry. The second order phase transition from ferro- to paramagnetic state is observed. The Curie temperature T_{C} defined as inflection point on the magnetization versus temperature curve recorded on zero-field cooled mode equals 262.5 K for the as-quenched material. With increasing the annealing temperature increase of T_{C} is observed. The maximum value of the magnetic entropy change (-ΔS) observed in the vicinity of the Curie point is equal to 0.85 J/(kg K) for the alloy in the as-quenched state. Moreover, for the samples annealed up to 750 K for 10 min the low intensity maximum at about 190 K related to the supplementary magnetic phase is observed. The presence of this phase was confirmed as additional component visible on hyperfine field distributions of Mössbauer spectra.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 676-679
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Co, Ni, and Cr addition on microstructure and magnetic properties of amorphous and nanocrystalline Fe86−xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys
    Autorzy:
    Łukiewska, A.
    Świerczek, J.
    Hasiak, M.
    Olszewski, J.
    Zbroszczyk, J.
    Gębara, P.
    Ciurzyńska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/147169.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous materials
    nanocrystalline materials
    Mössbauer spectroscopy
    invar effect
    Curie temperature
    Opis:
    Mössbauer spectra and thermomagnetic curves for the Fe86-xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys in the as-quenched state and after the accumulative annealing in the temperature range 600–800 K for 10 min are investigated. The parent Fe86Zr7Nb2Cu1B4 amorphous alloy is paramagnetic at room temperature, and substitution of 6 at.% of Fe by Co, Ni, and CoCr changes the magnetic structure – the alloys become ferromagnetic, whereas replacing 6 at.% of Fe with Cr preserves the paramagnetic state. After the heat treatment at 600 K, the decrease of the average hyperfi ne fi eld induction, as compared to the as-quenched state, is observed due to the invar effect. After this annealing, the Curie temperature for all investigated alloys decreases. The accumulative annealing up to 800 K leads to the partial crystallization; α-Fe or α-FeCo grains with diameters in the range of 12–30 nm in the residual amorphous matrix appear.
    Źródło:
    Nukleonika; 2015, 60, 1; 103-108
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure studies of amorphous and nanocrystalline (Fe1-xCox)85.4Zr6.8-yMyB6.8Cu1 (x = 0 or 0.1, y = 0 or 1, M = Mo, Nb or Nd) alloys
    Autorzy:
    Olszewski, J.
    Zbroszczyk, J.
    Fukunaga, H.
    Ciurzyńska, W.
    Świerczek, J.
    Hasiak, M.
    Perduta, K.
    Łukiewska, A.
    Młyńczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147229.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Invar effect
    nanocrystalline alloys
    interfacial zone
    Opis:
    The amorphous and nanocrystalline (Fe1 xCox)85.4Zr6.8 yMyB6.8Cu1 (x = 0 or 0.1, y = 0 or 1, M = Mo, Nb or Nd) alloys were studied using Mössbauer spectroscopy. We have stated that after the low temperature annealing of the samples the decrease of the average hyperfine field due to the Invar effect was observed. This effect is associated with the increase of atom packing density after the annealing of the samples, which may lead to the noncolinear spin state in some regions. This phenomenon was completely suppressed after substitution of 10% of Fe atoms by Co atoms. At early stages of crystallization of the Fe85.4Zr6.8 yMyB6.8Cu1 (y = 0 or 1, M = Mo, Nb or Nd) alloys, the interfacial zone is poor in iron due to diffusion of Zr, B, Nb, Mo and Nd atoms outside regions where á-Fe fine grains are created. However, the iron content in the amorphous matrix is the same as in the as-quenched state. The iron concentration in the interfacial zone of the nanocrystalline alloys obtained by the accumulative annealing depends on the chemical composition of the as-quenched samples. In the nanocrystalline samples obtained by two-step annealing, the iron content in the interfacial layer is higher than in the amorphous matrix.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 79-83
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Stability and Crystallization οf Iron and Cobalt - Based Bulk Amorphous Alloys
    Autorzy:
    Olszewski, J.
    Zbroszczyk, J.
    Sobczyk, K.
    Ciurzyńska, W.
    Brągiel, P.
    Nabiałek, M.
    Świerczek, J.
    Hasiak, M.
    Łukiewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811616.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.50.Bb
    76.80.+y
    Opis:
    Microstructure by the Mössbauer spectroscopy and approach to magnetic saturation in the bulk amorphous $Fe_{61}Co_{10}Me_7Y_2B_{20}$ ($Me_7$=$Y_7$, $Y_6Ti_1$ or $Zr_{2.5}Hf_{2.5}W_2$) alloys are investigated. The bulk amorphous $Fe_{61}Co_{10}Zr_{2.5}Hf_{2.5}W_2Y_2B_{20}$ alloy exhibits the best thermal stability and remains amorphous up to 901 K. Moreover, the quasi-dislocations dipoles present in this amorphous alloy have the largest width equal to 6.7 nm. After annealing this alloy below the crystallization temperature the enhancement of both the average hyperfine field and its standard deviation is observed which points to the increase in the atom packing density due to the decay of quasi-dislocation dipoles. After the annealing at 901 K the small amount of the crystalline α-FeCo phase is presented in this alloy. The same crystalline phase appears in the bulk $Fe_{61}Co_{10}Y_8Ti_1B_{20}$ and $Fe_{61}Co_{10}Y_9B_{20}$ alloys after annealing at 750 K and 840 K, respectively.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1659-1666
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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