Synthesis and magnetic properties of Ba2-xSmxFeMoO6 (0.0 ≤ x ≤ 0.1)Double perovskite

Double perovskite oxide compounds Ba2-xSmxFeMoO6 (0.0 ≤ x ≤ 0.1) have been synthesized by the sol-gel method. The effect of heat treatment on the synthesis of single-phase double perovskite Ba2FeMoO6 (BFMO) was investigated under H2/Ar at various temperatures. Their crystal structure has been explored through X-ray diffraction patterns (XRD). The Rietveld refinement described a cubic structure with an Fm-3m space group for the sample that was annealed at 900 °C. X-ray photoelectron spectroscopy (XPS) analyses showed that the average valence of Oxygen was obtained to be about −1.59 and −1.49 for the samples x = 0.0 and x = 0.05, respectively and the samples probably do not have mixed valences. Fourier transform infrared (FTIR) spectra exhibited a shift in the peak positions by doping Sm3+. Along with magnetization and ac susceptibility data, FESEM images were examined. By adding Sm+3 ions, the samples' morphology underwent a noticeable shift. The samples' transition temperature (Tc∼304–316) was calculated using the fictitious component of sensitivity. The degree of cationic ordering on the B site improved, and the variation of Curie temperature became nonlinear as doping rose.