Oxygen diffusion and phase transformation in YBa2Cu3O7−x
- 1 November 1989
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 66 (9) , 4325-4328
- https://doi.org/10.1063/1.343979
Abstract
Isothermal anneal experiments have been conducted over a wide temperature range from 300 to 900 °C for polycrystalline YBa2 Cu3 O7−x samples in air. The phase transformation and oxygen contents of the annealed samples were studied and determined by x‐ray diffraction and iodine titration. Oxygen diffusion coefficients at different temperatures were determined by a novel technique based on direct observation of the oxygen diffusion fronts by polarized light microscopy. The activation energy for the diffusion of oxygen in YBa2 Cu3 O7−x was obtained by an Arrhenius plot of the diffusion coefficients at different temperatures. The tetragonal‐to‐orthorhombic phase transformation controlled by oxygen diffusion is discussed.This publication has 14 references indexed in Scilit:
- Phase transformations inPhysical Review B, 1989
- Isothermal shear transformation in YBa2Cu3O7−δPhysica C: Superconductivity and its Applications, 1988
- Isothermal shear transformation in YBa2Cu3O7−δPhysica C: Superconductivity and its Applications, 1988
- Electrical conductivity and chemical diffusion in sintered YBa2Cu3OyMaterials Letters, 1988
- 60–90 K superconducting phase transition in YBa2Cu3O7−δApplied Physics Letters, 1988
- Oxygen diffusion in superconductingoxides in ambient helium and oxygenPhysical Review B, 1988
- Electronic behavior of oxygen-deficientPhysical Review B, 1988
- Oxygen content of superconducting perovskites, lanthanum strontium copper oxide La2-xSrxCuOy and yttrium barium copper oxide YBa2Cu3OyInorganic Chemistry, 1987
- Single-phase 60-K bulk superconductor in annealed with correlated oxygen vacancies in the Cu-O chainsPhysical Review B, 1987
- Oxygen ordering and the orthorhombic-to-tetragonal phase transition inPhysical Review B, 1987