Low-Pressure-Induced Large Reversible Barocaloric Effect Near Room Temperature In (Mnnige)-(Fecoge) Alloys

In the present work, a low pressure induced large reversible barocaloric effect was achieved in (MnNiGe)(0.91)-(FeCoGe)(0.09) alloys. The isothermal entropy change and the adiabatic temperature change are as high as 32.8 J kg(-1) K-1 and 5.2 K by applying hydrostatic pressure of 1 kbar, respectively. The reversible isothermal entropy change of 19.3 J kg(-1) K-1 and reversible adiabatic temperature change of 3.6 K within a temperature span of 16 K at 1 kbar have been achieved. Good reversible barocaloric performance is attributed to the combination of the thermal hysteresis of 6.4 K and the transition temperature shift with the pressure of 6.9 K kbar(-1). (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.