Temat: -Curie - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Microstructure and Soft Magnetic Properties of Fe-Zr-(Pt)-Nb-Cu-B Amorphous Alloys
Autorzy:: Gondro, J.
Błoch, K.
Nabiałek, M.
Walters, S.
Powiązania:: https://bibliotekanauki.pl/articles/356965.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: amorphous alloys
Mössbauer spectroscopy
magnetic susceptibility
Curie temperature
magnetic properties
Opis:: This paper presents the results of investigations into the microstructure and magnetic properties of Fe₈₆Zr₇Nb₁Cu₁B₅, Fe₈₂Zr₇Nb₂Cu₁B₈ and Fe₈₁Pt₅Zr₇Nb₁Cu₁B₅ alloys. The alloys were investigated in their as-quenched state, in the form of thin ribbons with approximate dimensions as follows: width 3 mm and thickness 20 μm. The investigations were performed utilizing Mössbauer spectrometry and X-ray diffractometry. Also, an evaluation of the low-field magnetic susceptibility and measurements of the magnetization versus temperature and magnetizing field were performed.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2A; 707-710
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Curie Temperature and Microstructural Changes Due to the Heating Treatment of Magnetic Amorphous Materials
Autorzy:: Gondro, J.
Błoch, K.
Brągiel, P.
Nabiałek, M.
Szota, M.
Powiązania:: https://bibliotekanauki.pl/articles/958228.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: amorphous alloys
magnetic properties
magnetic susceptibility
Mössbauer spectroscopy
Curie temperature
Opis:: Three distinct alloys: Fe₈₆Zr₇Nb₁Cu₁B₅, Fe₈₂Zr₇Nb₂Cu₁B₈, and Fe₈₁Pt₅Zr₇Nb₁Cu₁B₅ were characterized both magnetically and structurally. The samples, obtained with spinning roller method as a ribbons 3 mm in width and 20 μm thick, were investigated as-quenched and after each step of a multi steps heating treatment procedure. Each sample was annealed at four steps, fifteen minutes at every temperature, starting from 573K+600K up to +700K depending on type of alloy. Mössbauer spectroscopy data and transmission electron microscope (HRE M) pictures confirmed that the as-quenched samples are fully amorphous. This is not changed after the first stages of treatment heating leads to a reduction of free volumes. The heating treatment has a great influence on the magnetic susceptibilities. The treatment up to 600K improves soft magnetic properties: an χ increase was observed, from about 400 to almost 1000 for the samples of alloys without Pt, and from about 200 to 450 at maximum, for the Fe₈₁Pt₅Zr₇Nb₁Cu₁B₅. Further heating, at more elevated temperatures, leads to magnetic hardening of the samples. Curie temperatures, established from the location of Hopkinson’s maxima on the χ(T) curve are in very good agreement with those obtained from the data of specific magnetization, σ(T), measured in a field of 0.75T. As a critical parameter β was chosen to be equal 0.36 for these calculations, it confirmed that the alloys may be considered as ferromagnetic of Heisenberg type. Heating treatment resulted in decreasing of TC. These changes are within a range of several K.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 451-456
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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