Magnetocaloric effect above room temperature in the ordered double-perovskite Ba2Fe1+xMo1−xO6

Abstract Some effects of Fe/Mo disorder on magnetocaloric properties in double perovskite Ba2Fe1+xMo1−xO6 (x⩽0.3) nanorods, which were prepared by a wet chemistry method, have been investigated. The smooth rods are 2 μm in length and 100–150 nm in diameter. As x increases, the magnetization at 173 K in a field of 10 kOe decreases gradually from 37.3 emu/g for x=0 to 30.4 emu/g for x=0.3. The maximum |ΔSM| is in the order of 1.54 J/kg K for Ba2Fe1+xMo1−xO6 with x=0 upon 10 kOe applied field change. As x increase, the maximum values of the |ΔSM| decrease and the peaks of the |ΔSM| become broader.