Hydrothermal Synthesis and Characterization of Double Perovskites RSrMnFeO6(R=La,Pr,Nd,Sm)

A series of double perovskites RSrMnFeO6(R=La,Pr,Nd,Sm) was synthesized under mild hydrothermal conditions.Crystal growths of the samples were sensitive to alkalinity,temperature,filling fraction,and composition of initial reaction mixture.The desired series of compounds belongs to the class of AA’BB’O6perovskites with a random distribution of Mn and Fe atoms over the B-cation sub-lattice.Their structures show the distorted orthorhombic symmetry with space group Pnma.The shapes and sizes of the crystals were analyzed on a Rigaku JSM-6700F by scanning electron microscopy.Analysis done by XPS,Mssbauer spectroscopy and iodometric titration reveals that Mn and Fe ions have +4 and +3 oxidation states,respectively.