Crystal structure, infrared spectroscopic characterization and electrical property of double perovskite Sr2CoSbO6

Crystal structure, infrared (IR) spectroscopic characterization and electrical property of double perovskite Sr2CoSbO6 were investigated. The polycrystalline double perovskite Sr2CoSbO6 was prepared with standard solid-state reaction method in air, characterized by X-ray powder diffraction (XRD) and IR spectroscopy. The room-temperature structure was determined by the Rietveld method using XRD data. The result shows that the structure is not rhombohedral as was previously reported. It is monoclinic (space group P21/n) with a=5.5822(1) Å, b=5.6011(1) Å, c=7.8981(1) Å, and β=89.839(1)°. The refined Co–O and Sb–O average bond lengths are 2.01 and 1.99 Å, respectively. The valence states of cobalt and antimony are likely to be Co(III) and Sb(V) in Sr2CoSbO6.