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Wyświetlanie 1-7 z 7
Tytuł:
Measurements of Magnetocaloric Effect in $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x}$ (x=0.1, 0.2, 0.3) Alloys
Autorzy:
Gębara, P.
Pawlik, P.
Michalski, B.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1387211.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work, phase constitution and thermomagnetic properties of $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x}$ (where x = 0.1, 0.2, 0.3) alloys were investigated. Ingot samples were obtained by arc-melting under the low pressure of Ar atmosphere. Subsequently samples were annealed at 1323 K for 15 days. X-ray diffraction of all samples revealed coexistence of two crystalline phases dominant $La(Fe,Si)_{13}$-type and minor bcc α -Fe. Furthermore, the magnetic measurements at various temperatures allowed to study the Curie temperature, magnetic entropy changes and relative cooling power.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 576-578
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Magnetic Studies of the Fe-Co-Zr-Mo-W-B Amorphous Alloy
Autorzy:
Kotynia, K.
Pawlik, P.
Hasiak, M.
Pruba, M.
Pawlik, K.
Powiązania:
https://bibliotekanauki.pl/articles/1030235.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
75.50.Kj
75.30.Sg
75.30.Kz
75.40.-s
Opis:
The paper presents a characterization of the phase structure by X-ray diffraction and isothermal magnetic entropy changes for the amorphous Fe₅₈Co₁₀Zr₁₀Mo₅W₂B₁₅ alloy sample in the as-quenched state. An ingot sample was obtained by arc-melting. The ribbon sample was obtained by the melt-spinning technique. The magnetic measurements at various temperatures allowed for the study of the Curie temperature T_{C} and magnetic entropy changes |ΔS_{M}|. In order to determine the Curie temperature T_{C} of amorphous phase, three independent methods were used. Determination of the Curie temperature T_{C} for the amorphous alloys is not a trivial problem, as magnetization does not decreases rapidly around T_{C}. Therefore it is essential issue to establish T_{C} using few complementary methods. X-ray diffraction analysis revealed a fully amorphous structure of the ribbon samples.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1204-1206
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Magnetocaloric Study οf the $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ Alloy
Autorzy:
Gębara, P.
Pawlik, P.
Škorvánek, I.
Marcin, J.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1534407.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In this study, we have investigated the microstructure and magnetic entropy change of annealed $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ alloy in a form of bulk samples and melt-spun ribbons. The bulk samples were annealed at 1323 K for 20 and 49 days and the maximum values of the magnetic entropy change $| ΔS_M |$ obtained after the change of external magnetic field from 0 to 5 T reached 7.5 J $kg^{-1} K^{-1}$ and 7.7 J $kg^{-1} K^{-1}$, respectively. For the melt-spun ribbon annealed at the same temperature for 1 h, the maximum value of $| ΔS_M |$ reaches 4.5 J $kg^{-1} K^{-1}$. The temperature corresponding to the maximum entropy change increased from 292 K for bulk samples to 295 K for melt-spun ribbons. The lower values of the magnetic entropy change in the melt-spun $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ are attributed to the presence of higher volume fraction of the secondary bcc-Fe phase in the ribbon samples.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 910-912
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Ga Addition on Structure and Magnetic Properties of the $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x}$ (x=0.1, 0.2, 0.3) Alloys
Autorzy:
Gębara, P.
Pawlik, P.
Michalski, B.
Wysłocki, J.
Kotynia, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402328.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work, the phase constitution and magnetic properties of the $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x}$ (where x=0.1, 0.2, 0.3) alloys, were investigated. It was revealed that increase of Ga content in the alloy composition causes the rise of lattice parameter of the $La(Fe,Si)_{13}$-type phase, which causes increase of the Curie temperature. However, the increase of Ga addition leads to decrease of magnetocaloric effect.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 87-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Alloy Admixture on Structure and Properties of rm $La(Fe, Co, Si)_{13}$-Type Phase
Autorzy:
Gębara, P.
Pawlik, P.
Škorvánek, I.
Marcin, J.
Wysłocki, J.
Szwaja, M.
Pawlik, K.
Powiązania:
https://bibliotekanauki.pl/articles/1429027.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present study, the influence of Al and Ga admixture on the lattice parameters and the Curie point $T_{C}$ of the $La(Fe, Co, Si)_{13}$ compound was discussed. The measurements were carried out on ribbon samples of $LaFe_{11.0}Co_{0.8}Si_{1.2},$ $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ and $LaFe_{11.0}Co_{0.8}Si_{1.1}Ga_{0.1}$ alloys. The samples were subjected to annealing in the inert gas atmosphere at 1323 K for 24 h. The change of lattice parameters a with admixture of Al and Ga was determined from the X-ray diffraction analysis. Furthermore, changes of the Curie point with the alloy composition were observed.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1285-1287
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the magnetization reversal processes in nanocrystalline Nd-Fe-B alloys doped by Nb
Autorzy:
Kaźmierczak, M.
Pawlik, P.
Wysłocki, J.
Wnuk, I.
Gębara, P.
Pawlik, K.
Przybył, A.
Powiązania:
https://bibliotekanauki.pl/articles/1052622.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the following article the magnetic properties and phase composition of (Nd₁₀Fe₆₇B₂₃)_{100-x}Nb_{x} (where x=5, 6, 7, 8, 9) alloys in the form of ribbons are discussed. The X-ray diffraction studies revealed the coexistence of amorphous and nanocrystalline structures consisting of Nd₂Fe₁₄B, Nd_{1+ε}Fe₄B₄ and metastable Nd₂Fe₂₃B₃ phases. The shape of M_{rev} (M_{irr}) suggests that the magnetization reversal proceeds through the nucleation of the reversal domain for the ribbon doped with 5-7 at.% of Nb and the subsequent pinning of the domain walls for ribbons doped with 8 and 9 at.% of Nb.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 789-791
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermomagnetic Properties of $LaFe_{11.0}Co_{0.8}(Si_{1-x}Al_{x})_{1.2}$ (x=0, 0.6) Alloys
Autorzy:
Gębara, P.
Pawlik, P.
Skorvanek, I.
Marcin, J.
Pawlik, K.
Przybył, A.
Wysłocki, J.
Szwaja, M.
Filipecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1367677.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work, Curie temperature, refrigeration capacity and cooling power of the $LaFe_{11.0}Co_{0.8}(Si_{1-x}Al_{x})_{1.2}$ (where x=0, 0.6) alloys, are investigated. The value of Curie temperature was found to be 280 and 290 K for x=0 and 0.6, respectively. The determined values of cooling power (RCP) and refrigeration capacity (RC) differ only slightly for both investigated alloys. The maximum values of RCP and RC obtained under the change of external magnetic field from 0 to 5 T are 433 J/kg (for x=0) and 290 J/kg (for x=0.6), respectively.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 166-167
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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