I n   s i t u observation of the orthorhombic-tetragonal phase transformation in YBa2Cu3O7−δ

We have carried out in situ heat treatments of YBa2Cu3O7−δ at temperatures between 25 and 500 °C and oxygen pressure of 10 Torr. It was found that the original orthorhombic (OI phase) YBa2Cu3O7−δ transforms into the OII phase (still orthorhombic, but with a doubling of the a-axis, and with a δ=0.5)...

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Bibliographic Details
Published in:Journal of applied physics 1991-02, Vol.69 (4), p.2414-2417
Main Authors: Monteiro, Othon R., Evans, James W., Johnson, Sylvia M.
Format: Article
Language:English
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Summary:We have carried out in situ heat treatments of YBa2Cu3O7−δ at temperatures between 25 and 500 °C and oxygen pressure of 10 Torr. It was found that the original orthorhombic (OI phase) YBa2Cu3O7−δ transforms into the OII phase (still orthorhombic, but with a doubling of the a-axis, and with a δ=0.5) at about 250 °C. As the temperature is increased further, the tetragonal phase of YBa2Cu3O7−δ forms. As the tetragonal phase is slowly cooled to room temperature, the orthorhombic phase OI reappears. Cycling the temperature repeatedly has indicated the regenerability of the OI phase.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.348674