Low-pressure-induced giant barocaloric effect in an all-d-metal Heusler Ni35.5Co14.5Mn35Ti15 magnetic shape memory alloy

Citations Over TimeTop 10% of 2020 papers

Abstract

The clean and energy-efficient solid-state refrigeration based on magnetostructural phase transformation is a promising alternative technology for vapor-compression refrigeration. Herein, using a unique quasi-direct calorimetric method in a high hydrostatic pressure condition, we have studied the barocaloric effect for a Ni35.5Co14.5Mn35Ti15 all-d-metal Heusler alloy that undergoes a martensitic transformation accompanied by a large magnetization change. The martensitic transformation is found to be sensitive to either applied pressure or magnetic field with the large transformation temperature driving rates of 5.8 K kbar−1 and 2.0 K T−1. Such a sensitive response to external stimuli originates from the large lattice/volume- and magnetization-discontinuity on the phase transformation. The Ni35.5Co14.5Mn35Ti15 alloy exhibits a large barocaloric effect with an isothermal entropy change of −24.2 J kg−1 K−1and an adiabatic temperature change of 4.2 K, concomitant with a relatively low pressure change of 1 kbar, appearing to be the largest values among those of reported magnetic shape memory alloys. Moreover, by virtue of the strong magnetostructural coupling in the Ni35.5Co14.5Mn35Ti15 alloy, we propose a strategy of applying/releasing pressure and magnetic field in a proper sequence to eliminate the hysteresis and effectively enhance the reproducibility of the barocaloric effect.

Related Papers

• → Martensitic transformation and shape memory effect of Ti–V–Al lightweight high-temperature shape memory alloys(2014)78 cited
• → Martensitic transformation and shape memory properties of Ti–Ta–Sn high temperature shape memory alloys(2011)82 cited
• → Investigation on ferromagnetic shape memory alloys(2005)19 cited
• Recent Developments of Martensitic Transformation in Ferrous Shape Memory Alloys(2011)
• → Review of Magnetic Shape Memory Smart Materials(2020)