The Structure and Magnetocaloric Effect of MnCoGe Alloy Modified by Nb

• Autorzy: Kutynia Karolina , Gębara Piotr , Przybył Anna

Identyfikatory

DOI

10.24425/amm.2022.139678

• Języki publikacji: EN

Abstrakty

EN

The aim of this work was to investigate the effect of partial substitution of Mn by Nb on structure and thermomagnetic properties in the (Mn, Nb)-Co-Ge alloy. The master alloys were prepared by arc-melting in an arc furnace with high purity of constituent elements under a low pressure of Ar. The prepared specimens were studied in as-cast state. The X-ray was performed by BRUKER D8 Advance diffractrometer with Cu Kα radiation. The analysis of the XRD pattern revealed coexistence of two orthorhombic phases with different lattice constants. The analysis of the temperature dependence of magnetizaton confirmed the XRD results and showed that produced material manifested two magnetic phase transitions corresponding to detected phases. The values of the Curie temperature were 275 and 325 K. The values of magnetic entropy change ∆S_M equaled 3.30 and 2.13 J/(kg K), respectively for recognized phases. Biphase structure of produced material allowed to reach relatively high refigeration capacity 307 J/(kg). Moreover, the analysis of field dependences of magnetic entropy change (∆S_M = CBⁿ) allowed to construct temperature dependence of exponent n. The analysis of elaborated n vs. T curve confirmed biphasic structure of produced material.

Słowa kluczowe

EN

magnetocaloric effect; Heusler alloys; X-ray diffraction; magnetic measurement

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2022
• Tom: Vol. 67, iss. 3
• Strony: 879--883
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wzory

Twórcy

autor

Kutynia Karolina

• Czestochowa University of Technology, Institute of Physics, 19 Armii Krajowej Av., 42-200, Częstochowa, Poland

• https://orcid.org/0000-0003-0235-0197

autor

Gębara Piotr

• Czestochowa University of Technology, Institute of Physics, 19 Armii Krajowej Av., 42-200, Częstochowa, Poland

• https://orcid.org/0000-0003-4578-6556

autor

Przybył Anna

• Czestochowa University of Technology, Institute of Physics, 19 Armii Krajowej Av., 42-200, Częstochowa, Poland

• https://orcid.org/0000-0003-0428-3004

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Uwagi

1. The authors would like to thank Prof. Jan Świerczek, The Head of Department of Physics Częstochowa University of Technology for financial support.

2. Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).