Abstract
The inherent difficulties in preparing a single-phase oxide material from a system wherein the problem of oxygen nonstoichiometry is resident, as in the case of the high- T c superconducting ceramics, are indicated. In particular, it is shown that thermochemical analyrical studies must accompany phase-diagram studies in order to make an investigation of the phase-equilibrium behavior of such a system complete. The conditions pertaining to oxygen stoichiometry control in the preparation of the copper oxide-based superconductors are described.
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