Effects of Nd doping on the magnetocaloric properties of double perovskite Sr2FeMoO6

In this study, double perovskite oxide Sr 2 FeMoO 6 doped with Nd was prepared through sol–gel method. SNFMO belongs to the I 4/ m space group. The Fe/Mo order of SNFMO obtained from Rietveld refinement are 89.3%, 88.6%, and 88.2% for x  = 0.01, 0.03, and 0.05, respectively. For SNFMO ( x  = 0.01, 0.03, 0.05) samples, the values of Fe 3+ /Fe 2+ ratio are 1.41, 1.51, and 1.53, and the values of Mo 5+ /Mo 6+ ratio are 0.37, 0.48, and 0.54. According to the minimum dM / dT of the FC curves, the Curie temperatures of SNFMO are 378, 367, and 380 K for x  = 0.01, 0.03, and 0.05, respectively. H/M-M 2 curve analyses showed that all the samples have a second-order magnetic transition. In the magnetic field of 2.5 T, the maximum ΔS M of SNFMO ( x  = 0.01, 0.03, 0.05) samples were 0.36, 0.63, and 1.23 J kg −1  K −1 , respectively.