Ultra-low Hysteresis in Giant Magnetocaloric Mn1-xVxFe0.95(P,Si,B) Compounds

Description

Large thermal hysteresis in the (Mn,Fe)2(P,Si) system hinders an efficient heat exchange and thus limits the magnetocaloric applications. Substitution of manganese by vanadium in the Mn1-x1Vx1Fe0.95P0.593Si0.33B0.077 and Mn1-x2Vx2Fe0.95P0.563Si0.36B0.077 compounds enable a significant reduction in the thermal hysteresis without losing the giant magnetocaloric effect. For the composition closest to the critical one, where first-order crossovers to second-order phase transition in the series of x2 = 0.02, Mn0.98V0.02Fe0.95P0.563Si0.36B0.077 exhibits a thermal hysteresis that is reduced from 1.5 to 0.5 K by 67%, yielding an adiabatic temperature change of 2.3 K and magnetic entropy change of 5.6 J/kgK for an applied field of 1 T, which demonstrates its potential for highly efficient magnetic heat pumps utilizing low-cost permanent magnets.

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Netherlands Organization for Scientific Research 14013

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Guangdong Provincial Science and Technology Program 2015A050502015

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Guangzhou Municipal Science and Technology Program 201505041702137

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National Natural Science Foundation of Guangdong Province 2016A030313494

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European Commission. Fondo Europeo de Desarrollo Regional PID2019-105720RB-I00

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EIT Climate KIC project "Local, magnetocaloric power conversion opportunities for Cities" 210045

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