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    Wyświetlanie 1-6 z 6
    Tytuł:
    Microstructure and Magnetic Properties of the Nanocrystalline Fe-Co-Zr-Ti-Pr-B Alloys
    Autorzy:
    Pawlik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813665.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    75.50.Kj
    71.20.Eh
    Opis:
    Investigation of the $Fe_{60}Co_{13}Zr_1Ti_3Pr_9B_{14}$ alloy 1 mm diameter rods and 3 mm outer diameter tubes showed a possibility of processing nanocrystalline magnets by direct quenching. It was revealed that the low temperature annealing of the tube samples at 573 K/10 min resulted in an improvement of the intrinsic coercivity that reaches≈1260 kA/m, which was a similar value to that measured for thin ribbon annealed at 973 K/10 min. The X-ray diffraction analysis revealed that the hard magnetic $Pr_2(Fe, Co)_{14}B$ was the single crystalline phase that precipitated during rapid solidification process of the tube and rod samples and during devitrification annealing of the ribbons.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 315-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of annealing temperature on the magnetic properties of Pr-Fe-Co-Zr-Nb-B alloys ribbons
    Autorzy:
    Pawlik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050655.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    75.50.Tt
    81.40.Ef
    Opis:
    The properties of rapidly solidified ribbons of Pr₉Fe_{50+x}Co₁₃Zr₁Nb₄B_{23-x} (where x=2, 5, 8) alloys annealed at temperatures ranging from 923 K to 1033 K were investigated. The heat treatment of the fully amorphous as-cast ribbons led to the simultaneous crystallization of the hard magnetic Pr₂(Fe,Co)₁₄B, the soft magnetic α-Fe and the paramagnetic Pr_{1+x}Fe₄B₄ phases. However, the crystallization of the α-Fe phase took place as the second crystallization event at higher temperatures for the x=8 alloy. The Rietveld analysis of the X-ray diffraction patterns was used to calculate the crystallite sizes of constituent phases. Additionally, using PONKCS method the weight fractions of crystalline and amorphous components were quantified. For all alloy compositions the temperature dependencies of magnetic parameters were determined from the hysteresis loops.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 657-659
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization Reversal Processes in the Nanocrystalline Fe-Co-Zr-Ti-Pr-B Magnets
    Autorzy:
    Pawlik, K.
    Pawlik, P.
    Wysłocki, J.
    Kaszuwara, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813515.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    75.50.Kj
    71.20.Eh
    Opis:
    Magnetization reversal processes in the magnets derived from the $Fe_{60}Co_{13}Zr_1Ti_3Pr_9B_{14}$ alloy were investigated. It was shown that the processing technique affects the magnetization reversal processes. For the nanocrystalline ribbon samples pinning of the domain walls arises at low external magnetic fields while nucleation of reversed domains occurs at higher fields. However, the nucleation fields are lower than the pinning fields for the nanocrystalline rod and tube samples produced by suction-casting technique.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 39-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heat Treatment on the Phase Transformation and Magnetic Properties of the Rapidly Solidified Pr₉Fe₅₈Co₁₃Zr₁Nb₄B₁₅ Alloy Ribbons
    Autorzy:
    Pawlik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032999.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.En
    71.70.Gm
    75.50.Vv
    75.50.Ww
    Opis:
    The rapidly solidified ribbon samples of the Pr₉Fe₅₈Co₁₃Zr₁Nb₄B₁₅ alloy subjected to short time annealing at temperatures ranging from 923 K to 1033 K were investigated. The phase analysis supported by the Rietveld refinement was used to identify the phase constitution. The results of Rietveld calculations were confirmed by transimission electron microscopy and M(T) studies. Measurement of recoil curves allowed the determination of switching field distributions and δ M plots for samples annealed at various temperatures.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1264-1269
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Bulk Glass Forming Ability and Magnetic Properties of $Pr_9Fe_{50 + x}Co_{13}Zr_1Nb_4B_{23 - x}$ (x = 0, 2, 5, 8) Alloys
    Autorzy:
    Pawlik, K.
    Pawlik, P.
    Wysłocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534352.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    75.50.Kj
    71.20.Eh
    Opis:
    In the present study the rapidly quenched $Pr_9Fe_{50 + x}Co_{13}Zr_1Nb_4B_{23 - x}$ (x = 0, 2, 5, 8) alloy samples produced in a form of 100 $mm^2$ plate of various thicknesses were investigated. The X-ray diffraction revealed changes in the phase constitution of as-cast samples depending on the alloy composition and plate thickness. The presence of hard magnetic $Pr_2(Fe,Co)_{14}B$ phase was observed in 0.5 mm thick plates of the x = 8 alloy, while fully glassy structure was shown in 0.5 mm thick plates of the x = 0 alloy. It was shown in the present paper that magnetic properties of annealed samples originated from different microstructure of as-cast samples.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 900-902
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Magnetization Reversal Process of High-Remanent $Nd_{10}Fe_{83}Zr_1B_6$ Alloy in the As-Cast State
    Autorzy:
    Ceglarek, A.
    Płusa, D.
    Dośpiał, M.
    Nabiałek, M.
    Pietrusiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429022.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.50.Vv
    75.50.Ww
    75.60.Ej
    75.60.Jk
    Opis:
    In this work the magnetic properties of ribbons with composition of $Nd_{10}Fe_{83}Zr_1B_6$ obtained by using the melt-spinning method were studied. From the X-ray diffraction patterns the phase composition was determined. It was found that investigated alloy was composed of α-Fe and $Nd_2Fe_{14}B$ phases. From the peaks broadening the grain sizes of α-Fe and $Nd_2Fe_{14}B$ phases were estimated as equal to 20 nm and 40 nm, respectively. From the recoil curves the reversible $μ_0$ $M_{rev}$ and irreversible $μ_0 M_{irr}$ parts of magnetization and differential susceptibility $χ_{rev}$ and $χ_{irr}$ were determined as a function of an applied field. From these dependences it was found that the pinning of domain walls at the grain boundaries is the main magnetization reversal process. The interactions between grains were investigated by means of the δ M plot. It was stated that short range exchange interaction between grains of hard and soft phases are dominant and causes the remanence enhancement.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1279-1281
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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