Abstract
Double perovskite R2NiMnO6 (R=Pr, Nd, Tb, Ho and Y) composites are prepared via solid state synthesis or nitrate route. Isothermal magnetic entropy change (ΔSM(T,H)) and relative cooling power (RCP) for all systems are calculated and compared. All of them possess relatively high values of ΔSM(T,H) and RCP as compared to many perovskite and double perovskite systems reported previously. Ho2NiMnO6 has the highest value for |ΔSM(T,H)| and RCP as 8.4JKg−1K−1 at 70kOe and 59.18JKg−1 at 20kOe respectively. This study highlights the potential of magnetocaloric refrigerant materials at low temperature.
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