In this study, the influence of interstitial C atoms on the magnetostructural transformation and magnetocaloric effect in MnNi0.77Fe0.23GeCx (x = 0, 0.02, and 0.03) compounds has been investigated. The introduction of C atoms into the interstitial sites of the MnNi0.77Fe0.23Ge compounds leads to the enhanced stability of the orthorhombic phase, thus enhancing the structural transition temperature. Moreover, the critical field of antiferromagnetic (AFM)–ferromagnetic (FM) conversion significantly decreases following C atom incorporation. Therefore, it can be inferred that C atoms can promote the AFM–FM conversion in the TiNiSi-type orthorhombic phase. The MnNi0.77Fe0.23GeCx compound with x = 0.02 exhibits a large magnetocaloric effect due to the ferromagnetic magnetostructural transition. Furthermore, for the compound with x = 0.03, a table-like magnetocaloric effect is observed around room temperature owing to the coupling of the martensitic and metamagnetic transitions, which confirms the wide working temperature range and a large refrigerant capacity.
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14 July 2020
Research Article|
July 10 2020
Effects of interstitial C atoms on magnetostructural transformation and magnetocaloric effect in MnNi0.77Fe0.23GeCx compounds
Special Collection:
Multicalorics
He Zhou;
He Zhou
1
School of Materials Science and Engineering, University of Science and Technology Beijing
, Beijing 100083, People’s Republic of China
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Hu Zhang
;
Hu Zhang
a)
1
School of Materials Science and Engineering, University of Science and Technology Beijing
, Beijing 100083, People’s Republic of China
a)Author to whom correspondence should be addressed: zhanghu@ustb.edu.cn. Tel.: +86-10-62334807
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Fengxia Liu;
Fengxia Liu
1
School of Materials Science and Engineering, University of Science and Technology Beijing
, Beijing 100083, People’s Republic of China
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Daoyong Cong
;
Daoyong Cong
2
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
, Beijing 100083, People’s Republic of China
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Yingli Zhang;
Yingli Zhang
3
Voggenreiter Technology (Beijing) Co. Ltd.
, 3006 Jinao International, No.19 Madian East Rd., Haidian Dist., Beijing 100088, People’s Republic of China
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Yi Long
Yi Long
1
School of Materials Science and Engineering, University of Science and Technology Beijing
, Beijing 100083, People’s Republic of China
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a)Author to whom correspondence should be addressed: zhanghu@ustb.edu.cn. Tel.: +86-10-62334807
Note: This paper is part of the Special Topic on Multicalorics.
J. Appl. Phys. 128, 023902 (2020)
Article history
Received:
December 26 2019
Accepted:
June 24 2020
Citation
He Zhou, Hu Zhang, Fengxia Liu, Daoyong Cong, Yingli Zhang, Yi Long; Effects of interstitial C atoms on magnetostructural transformation and magnetocaloric effect in MnNi0.77Fe0.23GeCx compounds. J. Appl. Phys. 14 July 2020; 128 (2): 023902. https://doi.org/10.1063/1.5143608
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