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Effects of annealing treatments on the YBa2Cu3O7-x system

The effects of the annealing treatments on the superconducting properties and the crystallographic structure of YBa2Cu3O7-x (YBCO) have been investigated. Annealing treatments in air at temperatures higher than 450°C have been found to decrease the transition temperature. A decrease of the orthorhombic distortion has also been observed. Both effects are reversible under oxygen treatment at temperatures higher than 450°C.