Hydrothermal Synthesis and Characterization of Double Perovskites RSrMnFeO_6(R=La,Pr,Nd,Sm)

摘要

A series of double perovskites RSrMnFeO_6(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'O_6 perovskites 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.