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A new high-pressure form of BaCuO2 + x

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
233
Identifiers
DOI: 10.1016/0921-4534(94)90765-x

Abstract

Abstract A new high-pressure form of BaCuO 2 + x has been observed in specimens synthesized at 5 GPa. It shows a fundamental structure similar to the high-temperature form of hexagonal (4H)-BaMnO 3. The compound crystallizes in an orthorhombic unit cell with the lattice parameters α = 9.827 (1) A ̊ , b = 5.6783 (7) A ̊ and c = 9.5252 (4) A ̊ and belongs to the space group P222 1. Based on both the high resolution transmission electron microscopic image and Rietveld analysis on X-ray diffraction patterns, a structural model is proposed. The calculated and observed X-ray patterns are in reasonable agreement.

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