Evaluation of Oxygen Nonstoichiometry in High-Tc Superconductors
- 1 December 1988
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 27 (12A) , L2304
- https://doi.org/10.1143/jjap.27.l2304
Abstract
A sensitive method has been developed for the determination of oxygen nonstoichiometry in YBa2Cu3O6.5+x superconductors to critically examine the orthorhombic phase containing low-T c or high-T c superconducting material. Oxygen is evolved on reacting a few mg of powdered sample with dilute nitric acid in helium atmosphere in a closed circuit in a specially designed glass sampler and analyzed by gas chromatographic techniques using a thermal conductivity detector. In the samples analyzed, the x value varies from 0.47 to 0 indicating the change from the high-T c to the low-T c orthorhombic phase. The accuracy of the measurement is better than 3%.Keywords
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