Study of Martensitic Transformation and Barocaloric Effect of Co50Fe2V32Ga16 Heusler Alloy

Abstract

Abstract: A Co₅₀Fe₂V₃₂Ga₁₆ quaternary Heusler alloy has been fabricated by means of arc-melting approach. The crystal structure, martensitic transformation feature and thermodynamical properties at different hydrostatic pressure of the studied sample have been investigated by using X-ray powder diffractometer, vibrating sample magnetometer and differential scanning calorimeter equipped with high-pressure nitrogen generator. The experimental results indicate that the martensitic transformation near room temperature of this sample occurs at paramagnetic-like state, and there exists a relatively large volume difference between austenitic and martensitic phases. Due to this, when the hydrostatic pressure of 1 kbar is applied, both the isothermal entropy change (ΔS_T) and the adiabatic temperature change (ΔT_ad) of the studied sample achieve-21 J/kg K and 2.5 K respectively, which are superior to those previously reported in many barrocaloric materials, performing a potential application prospect for solid-state refrigeration technique.

Key words: Heusler alloy, Martensitic transformation, Barocaloric effect

CLC Number:

O469

LI Zhe, LI Yong, GAO Hongyan, LIU Hongwei. Study of Martensitic Transformation and Barocaloric Effect of Co₅₀Fe₂V₃₂Ga₁₆ Heusler Alloy[J]. Journal of Qujing Normal University, 2021, 40(6): 1-5.

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Study of Martensitic Transformation and Barocaloric Effect of Co₅₀Fe₂V₃₂Ga₁₆ Heusler Alloy

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