Evaluation of Oxygen Nonstoichiometry in High-Tc Superconductors
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-Tc or high-Tc 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-Tc to the low-Tc orthorhombic phase. The accuracy of the measurement is better than 3%.
- Publication:
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Japanese Journal of Applied Physics
- Pub Date:
- December 1988
- DOI:
- 10.1143/JJAP.27.L2304
- Bibcode:
- 1988JaJAP..27L2304P