Crystal Structure of the Orthorhombic Form of Ba2YCu3O7-x at 42 K
- 1 July 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (7A) , L1193
- https://doi.org/10.1143/jjap.26.l1193
Abstract
The crystal structure of the low-temperature form of Ba2YCu3O7-x at 42 K was refined by the Rietveld analysis of TOF neutron powder diffraction data. This material is orthorhombic with space group Pmmm and lattice constants a=3.8800 Å, b=3.8122 Å, and c=11.6264 Å. It has an oxygen-deficient triperovskite structure in which oxygen atomson a z=1/2 plane are lacking completely, two oxygen sites on a z=0 plane are partially occupied, and Ba2+ and Y3+ ions are ordered in a [Ba-Y-Ba]∞ sequence along the c axis. The occupation factors of oxygen at (1/2, 0, 0) and (0, 1/2, 0) are 0.84 and 0.05, respectively.Keywords
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