Martensitic Transformation and Barocaloric Effect in Co-V-Ga-Fe Paramagnetic Heusler Alloy

Jie Liu; Zhe Li; Hongwei Liu; Litao Yu; Yuanlei Zhang; Yiming Cao; Kun Xu; Yongsheng Liu

doi:10.3390/met12030516

Metals (Mar 2022)

Martensitic Transformation and Barocaloric Effect in Co-V-Ga-Fe Paramagnetic Heusler Alloy

Jie Liu,
Zhe Li,
Hongwei Liu,
Litao Yu,
Yuanlei Zhang,
Yiming Cao,
Kun Xu,
Yongsheng Liu

Affiliations

Jie Liu: Department of Physics, Shanghai University of Electric Power, Shanghai 200090, China
Zhe Li: Center for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, China
Hongwei Liu: Center for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, China
Litao Yu: Department of Physics, Shanghai University of Electric Power, Shanghai 200090, China
Yuanlei Zhang: Center for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, China
Yiming Cao: Center for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, China
Kun Xu: Center for Magnetic Materials and Devices, College of Physics and Electronic Engineering, Qujing Normal University, Qujing 655011, China
Yongsheng Liu: Department of Physics, Shanghai University of Electric Power, Shanghai 200090, China

DOI: https://doi.org/10.3390/met12030516
Journal volume & issue: Vol. 12, no. 3
p. 516

Abstract

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In the present study, polycrystalline Co50V34Ga16−xFex (1≤x≤2) quaternary Heusler alloys were fabricated by the arc-melting method. It was found that they undergo a paramagnetic martensitic transformation (MT) from the L21-type cubic austenitic structure to the D022 tetragonal martensitic structure. With the increase of the Fe concentration, the MT shifts towards a higher temperature range, which is strongly related to the variation of the valence electron concentration. Moreover, it was also found that the MT exhibited by every alloy is sensitive to the applied hydrostatic pressure due to a relatively high difference in volume between the two phases. By using the quasi-direct method based on caloric measurements, the barocaloric effect (BCE) associated with the hydrostatic pressure-driven MT was estimated in the studied alloys. The results demonstrated that the sample with x=1.5 performs an optimal BCE among these three alloys.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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