Effects of carbon doping on structure and magnetocaloric properties of Mn1.25Fe0.7P0.5Si0.5 alloys

Jimei Niu; Zhigang Zheng

doi:10.1515/ijmr-2021-8248

Artikel

Effects of carbon doping on structure and magnetocaloric properties of Mn_1.25Fe_0.7P_0.5Si_0.5 alloys

Jimei Niu und Zhigang Zheng

Veröffentlicht/Copyright: 5. November 2021

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Aus der Zeitschrift International Journal of Materials Research Band 112 Heft 11

Abstract

(Mn,Fe)₂(P,Si)-basedmaterials are promisingly applied in the room-temperature magnetic refrigeration field. In this study, Mn_1.25Fe_0.7P_0.5Si_0.5Cx (x = 0, 0.01, 0.03 and 0.05) alloys were prepared by arc-melting and then a two-stage sintering process. The effects of C doping on the crystal structure and magnetocaloric behavior are discussed. Results indicate that the Fe₂P-type structure (space group of P62 m) was crystallized for all samples with weakened first-order magnetic transitions (FOMT). The Curie temperature could be altered from 223.5 K to 278.5 K with the large magnetocaloric effect (MCE) remaining by C doping. In the applied magnetic field of 5 T, the peak value of magnetic entropy change (–ΔS_M) increased by 7.3% to reach 25.1 J × kg^–1 × K^–1. The temperature-induced entropy change (ΔS_DSC) derived from DSC was slightly larger than ΔS_M induced by the magnetic field. The Mn_1.25Fe_0.7P_0.5Si_0.5 alloys with large MCE can be effectively tuned by C doping because C atoms prefered to share the substitute and occupy the interstitial sites in hexagonal Fe₂P-type structure.

Keywords: Magnetocaloric effect; Structure; (Mn; Fe)2(P, Si) alloys

Ms Jimei Niu Guangzhou College of South China University of Technology Guangzhou, 510800 P. R. China Tel.: +86 (020)36903405

Funding statement: This work was supported by Characteristic innovation projects of Guangdong Province (No. 2020 KTSCX203), and Yunfu Municipal Science and Technology Program (No. 2020A090103), Guangdong Provincial Science and Technology Program (Grant No. 2020A1414010135), Natural Science Foundation of Guangdong Province (No. 2020A1515010736, 2021A1515010451).

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Received: 2021-02-16

Accepted: 2021-08-03

Published Online: 2021-11-05

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https://doi.org/10.1515/ijmr-2021-8248

Schlagwörter für diesen Artikel

Magnetocaloric effect; Structure; (Mn; Fe)2(P, Si) alloys