We have synthesized a new perovskite-type compound with nominal composition CaPbO3 under about 6 GPa using a cubic-anvil-type apparatus from a mixed powder of high-purity CaO and PbO2. The XRD pattern was indexed on the basis of an orthorhombic unit cell with a = 5.667(1) Å, b = 5.879(1) Å and c = 8.147(2) Å. This compound has a distorted perovskite-type structure, while two previously reported types of CaPbO3 have a fluorite-type structure and an ilmenate-type structure. EDX analysis and the unit cell parameters suggest a deficiency in the Ca site. The electrical resistivity of this compound at room temperature was very high ( > 105 Ω cm) in contrast to the metallic and semiconducting conductivity of BaPbO3 and SrPbO3, respectively.
ASJC Scopus subject areas
- 化学 (全般)