Abstract
Before going into details of preparation, it would be worthwhile to note the undermentioned properties of YBCO system, as these are of relevance in determining the preparation procedure: On heating the Y:123 compound, it decomposes peritectically at about 1,020–1,040°C into Y2BaCuO5, CuO and BaCuO2. For this reason, all preparation steps should better be carried out at temperatures below 1,000°C. Y1Ba2Cu3O7 (i.e. orthorhombic phase) is unstable at temperatures higher than 650°C. At 900–950◦C, the oxygen content per formula unit is less then 6.5 and the structure become tetragonal. If quenched in this form, the material is non-superconducting. To regain the oxygen to the desired value (i.e. close to 7), the material should be given a long anneal in O2 in the temperature range of 400–500◦C, to enable the oxygen pick up. Otherwise oxygen can be incorporated by annealing at ∼900◦C in flowing oxygen for short durations and then, slow cooling in oxygen atmosphere.
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Keywords
- Molecular Beam Epitaxy
- Electroless Deposition
- Lower Substrate Temperature
- Gadolinium Gallium Garnet
- YBCO Thin Film
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Saxena, A.K. (2009). Synthesis of High T c Superconductors. In: High-Temperature Superconductors. Springer Series in Materials Science, vol 125. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00712-5_4
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