Double perovskite oxides Ba 2-x Ag x FeMoO 6 (x=0.0, 0.025, 0.05)

Double perovskite Ba 2 FeMoO 6 (BFMO) substituted with monovalent Ag ions was synthesized using the sol-gel method, and its structure and magnetic properties were systematically studied. Rietveld refinement showed that the samples had a single phase with a cubic structure and an Fm -3m space group. With Ag substitution, the lattice parameter and unit cell of BFMO increased linearly, and the morphology of the samples was altered. X-ray photoelectron spectroscopy (XPS) examination showed mixed valence in the sample with x = 0.025 due to the Ag doping. The doped samples exhibited a decrease in magnetization, an increase in transition temperature, and anti -site (AS) defects. The AC magnetic susceptibility of the sample with x = 0.025 showed two peaks attributed to the two critical temperatures.