Equilibrium Phase Diagram for the La<sub>2</sub>O<sub>3</sub>-SrO-CuO System at 1173K in Air

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  • KITAGUCHI Hitoshi
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • OHNO Masashi
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • KAICHI Masa-aki
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • TAKADA Jun
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • OSAKA Akiyoshi
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • MIURA Yoshinari
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • IKEDA Yasunori
    Instiute for Chemical Research, Kyoto University
  • TAKANO Mikio
    Instiute for Chemical Research, Kyoto University
  • BANDO Yoshichika
    Instiute for Chemical Research, Kyoto University
  • TAKEDA Yasuo
    Department of Chemistry, Faculty of Engineering, Mie University
  • KANNO Ryoji
    Department of Chemistry, Faculty of Engineering, Mie University
  • YAMAMOTO Osamu
    Department of Chemistry, Faculty of Engineering, Mie University

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Other Title
  • La<sub>2</sub>O<sub>3</sub>-SrO-CuO系平衡状態図について
  • La2O3 SrO CuOケイ ヘイコウ ジョウタイズ ニ ツイテ

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Phase equilibrium in the La-Sr-Cu-O system has been studied mainly by the X-ray diffraction analysis. The equilibrium phase diagram of the La2O3-SrO-CuO system was drawn up at 1173K in air. We found two new compounds; Sr3Cu5Ox and La4SrCu5Ox. Sr3Cu5Ox has an orthorhombic structure with lattice parameters; a=3.956, 6=13.412 and c=11.475 in A. U. It was confirmed that the K2NiF4-type oxide (La1-αSrα)2CuOx is a solid solution of 0≤α≤0.5 in which the terminal compounds are La2CuO4 and LaSrCuO4, respectively. In contrast with an orthorhombic La2CuO4 (α=0), (La1-αSrα)2CuOx of 0.1≤α≤0.5 has a tetragonal structure. (La1-αSrα)2CuOx coexists with CuO, La4SrCu5Ox and La2SrCu2O6 for 0≤α≤0.05, 0.05≤α≤0.13 and 0.13≤α≤0.5, respectively. The dependence of lattice parameters of the solid solution (La1-αSrα)2CuOx on α was also determined.

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