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

Jimei Niu and Zhigang Zheng

Abstract

(Mn,Fe)2(P,Si)-basedmaterials are promisingly applied in the room-temperature magnetic refrigeration field. In this study, Mn1.25Fe0.7P0.5Si0.5Cx (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 (–ΔSM) increased by 7.3% to reach 25.1 J × kg–1 × K–1. The temperature-induced entropy change (ΔSDSC) derived from DSC was slightly larger than ΔSM induced by the magnetic field. The Mn1.25Fe0.7P0.5Si0.5 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.


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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