Low-pressure-induced large barocaloric effect in MnAs0.94Sb0.06 alloy around room temperature

The barocaloric effect (BCE) is a promising alternative to traditional vapor compressing refrigeration because of its environmentally friendly impact and high energy efficiency. However, the driving hydrostatic pressure for most BCE materials is relatively high, which is not conducive to practical application. In this paper, we report that the large barocaloric entropy change of MnAs(0.94)S(b0.0)6 alloy can be induced by low hydrostatic pressures. Its phase transition temperature is strongly sensitive to the applied pressure, resulting in a large barocaloric coefficient of 134 K.GPa(-1) on cooling and 126 K.GPa(-1) on heating. The maximum barocaloric entropy change and adiabatic temperature change resulted from hydrostatic pressure of 40 MPa reach up to 26.3 J.kg(-1).K-1 and 14.4 K, respectively, showing an excellent barocaloric performance. The results demonstrate that the MnAs0.94Sb0.06 alloy is a promising alternative for BCE refrigeration.

Automated summary

This study finds that MnAs(0.94)S(b0.0)6 alloy exhibits a large barocaloric entropy change under low hydrostatic pressures, showing excellent barocaloric cooling performance.