Orthorhombic-tetragonal phase transition in high-temperature superconductor YBa2Cu3O7

We have determined the effect of elevated temperature on the crystal structure and lattice parameters of the single-phase high-temperature superconductor YBa2Cu3O7 using high-temperature x-ray powder diffractometry. This compound is orthorhombic below about 550 °C (depending on oxygen partial pressu...

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Bibliographic Details
Published in:Applied physics letters 1987-08, Vol.51 (5), p.367-368
Main Authors: EATOUGH, M. O, GINLEY, D. S, MOROSIN, B, VENTURINI, E. L
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
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Summary:We have determined the effect of elevated temperature on the crystal structure and lattice parameters of the single-phase high-temperature superconductor YBa2Cu3O7 using high-temperature x-ray powder diffractometry. This compound is orthorhombic below about 550 °C (depending on oxygen partial pressure) and transforms to a tetragonal polymorph at higher temperatures. The reversibility of this transition depends on the oxygen partial pressure. An oxygen ‘‘hopping’’ mechanism with possible oxygen loss, which appears consistent with the known structural details, is proposed for the transition.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.98443