Abstract
Oxide ceramics with compositions were prepared by high-temperature reaction in the temperature range from a mixture of the powder oxides , and CuO. Microthermogravimetric measurements on these ceramics containing excess CuO or deficient in CuO have shown that these ceramics can contain substantial CuO impurities, as revealed by the detection of a transition as well as by an oxygen stoichiometry variation accompanying the melting of - mixtures corresponding to the - eutectic. Under high oxygen pressure ( atm), a decrease in free CuO concentration in the ceramics is observed for very long annealing times at high temperature which is attributed to loss of copper oxide. Under low oxygen pressures ( atm), irreversible reduction/oxidation cycles were observed which cannot be attributed to the loss of copper oxides. The origins of this process, which has very detrimental effects on the superconducting properties of the material, are discussed.
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