title: High-pressure synthesis, structure, and characterization of a post-perovskite CaPtO3 with CaIrO3-type structure.
abstract: A new ternary platinum oxide, CaPtO3 was synthesized under a pressure of 7 GPa and a temperature of 1000 degrees C. The crystal structure of CaPtO3 was determined by Rietveld analysis of the X-ray powder diffraction data. CaPtO3 has a layered CaIrO3-type structure (orthorhombic, space group: Cmcm), which is the same as that of a post-perovskite MgSiO3 in the Earth's lower mantle. The magnetic susceptibility data indicate that the Pt ion in CaPtO3 is tetravalent in the low spin state with an electron configuration of t2g(6)eg(0)(S = 0). This finding is consistent with the insulating behavior.
authors.affiliation: Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Tokyo 171-8588, Japan. yoshiyuki.inaguma@gakushuin.ac.jp
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Inaguma
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Hasumi
authors.forename: Masashi
authors.initials: M
authors.lastname: Yoshida
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ohba
authors.forename: Tetsuhiro
authors.initials: T
authors.lastname: Katsumata