Magnetocaloric properties of R2NiMnO6 (R=Pr, Nd, Tb, Ho and Y) double perovskite family

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