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Wyszukujesz frazę "Gondro, J." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Structure and magnetic properties of amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ and crystalline Fe₈₂Zr₆Y₁Nb₂Cu₁B₈ alloys
Autorzy:
Gondro, J.
Błoch, K.
Nabiałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1153084.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Np
75.50.Bb
75.50.Kj
75.90.+w
Opis:
In order to obtain an alloy with a specific set of magnetic properties, the dominant influences of chemical component and thermal treatment selection need to be satisfied. In this paper, the results of investigations into the microstructure and magnetic properties of the following alloys are presented: amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ and crystalline Fe₈₂Zr₆Y₁Nb₂Cu₁B₈. The structure and microstructure were examined using the Mössbauer spectroscopy and X-ray diffractometry. The Fe₈₂Zr₇Nb₂Cu₁B₈alloy was found to be fully amorphous in the as-quenched state and the transmission Mössbauer spectrum for this alloy is typical of that for weak ferromagnets, with an average hyperfine field of 9.86(2) T. The shape of this spectrum was found to have changed noticeably in the case of the Fe₈₂Zr₆Y₁Nb₂Cu₁B₈ alloy. This change was attributed to the presence of the crystalline phase bcc-Fe.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 909-912
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetocaloric Effect in Amorphous and Partially Crystallized Fe-Zr-Nb-Cu-B Alloy
Autorzy:
Gondro, J.
Błoch, K.
Nabiałek, M.
Wallters, S.
Powiązania:
https://bibliotekanauki.pl/articles/1387568.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.47.Np
75.50.Bb
75.50.Kj
75.90.+w
87.64.Pj
Opis:
This paper presents the results of an investigation into the: microstructure, magnetic properties and influence of annealing temperature on the magnetocaloric effect of Fe₈₂Zr₇Nb₂Cu₁B₈ alloy in the as-quenched and partially crystalline state. The microstructure was investigated using Mössbauer spectroscopy. The magnetocaloric effect was observed as a change in the magnetic entropy, which was calculated from isothermal magnetization curves. Fully-amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ alloys, in the as-quenched state, exhibit a Curie temperature equal to (340±5) K. The transmission Mössbauer spectrum for the as-quenched Fe₈₂Zr₇Nb₂Cu₁B₈ alloy is typical for weak ferromagnets with the average hyperfine field of 9.86(2) T. For this alloy in the as-quenched state, the changes in maximum magnetic entropy occur near the Curie points and are equal to 0.95 J/(kg K). Also, the maximum magnetic entropy changes decrease after partial crystallization.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 606-607
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Relaxations in Amorphous $Fe_{61}Co_{10}Y_{8}Zr_{1}B_{20}$ Alloy
Autorzy:
Pietrusiewicz, P.
Błoch, K.
Gondro, J.
Nabiałek, M.
Dośpiał, M.
Szota, M.
Powiązania:
https://bibliotekanauki.pl/articles/1367356.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Lr
75.50.-y
75.50.Kj
75.30.Cr
Opis:
Effects of annealing on the disaccommodation phenomenon in bulk metallic glasses (BMGs), obtained by injection-casting method have been studied. The amorphous structure has been confirmed using X-ray diffractometer. The annealing process has been performed at temperature below the crystallization temperature. For all investigated samples the disaccommodation curves have been determined. The susceptibility and its disaccommodation have been used in order to define thermal and time stability of magnetic properties. Obtained results have also been used to determine activation energies of elementary processes.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 106-107
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time and Thermal Stability of Magnetic Properties in $Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20}$ Bulk Amorphous Alloys
Autorzy:
Błoch, K.
Nabiałek, M.
Pietrusiewicz, P.
Gondro, J.
Dośpiał, M.
Szota, M.
Gruszka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1367363.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Lr
75.50.-y
75.50.Kj
75.30.Cr
Opis:
The paper presents studies of time and thermal stability of magnetic properties in $Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20}$ bulk amorphous alloys. The investigated sample was prepared by suction-casting method in the form of plate. The structure was studied using X-ray diffractometry. It was found that alloy was amorphous in the as-cast state. The magnetic properties were determined using completely automated set up for measurement of susceptibility and its disaccommodation. The disaccommodation curve was decomposed into three elementary processes, each of them was described by Gaussian distribution of relaxation times. From fit of theoretical curve the peak temperature, intensity at peak temperature, average activation energies, distribution parameter and pre-exponential factor of the Arrhenius law were determined. The obtained results indicate that the disaccommodation phenomenon in studied samples is related with directional ordering of atom pairs near the free volumes.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 108-109
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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