Ultra-low Hysteresis in Giant Magnetocaloric Mn1-xVxFe0.95(P,Si,B) Compounds
J. Lai (South China University of Technology, TU Delft - RST/Fundamental Aspects of Materials and Energy)
X. You (TU Delft - RST/Fundamental Aspects of Materials and Energy)
Jiayan Law (University of Seville)
Victorino Franco (University of Seville)
B. Huang (South China University of Technology, TU Delft - RST/Fundamental Aspects of Materials and Energy)
Dimitrios Bessas (European Synchrotron Radiation Facility, F-38043, Grenoble, France)
M. Maschek (TU Delft - RST/Fundamental Aspects of Materials and Energy)
Dechang Zeng (South China University of Technology)
N.H. van Dijk (TU Delft - RST/Fundamental Aspects of Materials and Energy)
E.H. Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)
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Abstract
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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