Applied Physics Letters · 1987 · 74 citations · 3 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsHigh-temperature MaterialsPhase EquilibriaPhase TransitionsSolid-state Phase TransitionsStrongly Correlated Electron SystemsSuperconducting MaterialsCuprate SuperconductorsHigh-temperature SuperconductivityHigh-temperature SuperconductorsLattice ParametersOxygen Partial Pressure EffectsPowder X-ray DiffractionStructural DetailsSuperconducting Phase Transitions
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.
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Structure of the single-phase high-temperature superconductor YBa2Cu3O7−δ
Mark A. Beno, L. Soderholm, D. W. Capone et al. · Applied Physics Letters · 1987 · 665 citations
HIGH-TEMPERATURE SUPERCONDUCTORS
Analytical Chemistry · 1988 · 456 citations