Crystal Structure of the Tetragonal Form of Ba2YCu3O7-x

Authors:
  • FIFujio Izumi
    Fujio Izumi
  • ETEiji Takayama-Muromachi
    Eiji Takayama-Muromachi
  • YUYoshishige Uchida
    Yoshishige Uchida
  • NWNoboru Watanabe
    Noboru Watanabe

Abstract
The crystal structure of the high-temperature form of Ba2YCu3O7-x was refined by the Rietveld analysis of TOF neutron powder diffraction data taken at 49 K. This compound is tetragonal with lattice constants a = 3.8533 Å and c = 11.7631 Å. It has an oxygen-deficient triperovskite structure, in which oxygen atoms on a z = 1/2 plane are missing, an oxygen site at (0, 1/2, 0) is about 9% occupied, and Ba2+ and Y3+ ions are completely ordered in a [Ba-Y-Ba]∞, sequence along the c axis.

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