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⁻¹K⁻¹ and 5.2 K by applying hydrostatic pressure of 1 kbar, respectively. The reversible isothermal entropy change of 19.3 J·kg⁻¹K⁻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.