Abstract
Thermogravimetry in controlled oxygen atmospheres and barometric measurements between 300 and 1200 K were performed on the YBa2Cu3O x superconducting phase. The complete reversibility of the exchange of a certain part of the oxygen, as found even at 250 °C, and the observed relationship between oxygen partial pressure, oxygen content and temperature, can be explained by the dissolution of oxygen in YBa2Cu3O x . It is concluded that samples with highx values (≈), as necessary for good superconducting properties, can be obtained at high temperatures only at high oxygen pressures, but they were obtained by annealing at normal pressure between 250 and 350 °C.
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