Abstract
Results are related to ordering of oxygen vacancies in the YBa 2 Cu 3 O 7−x lattice. The concentration and ordering of oxygen in the lattice of YBa 2 Cu 3 O 7−x are fundamental for its superconducting properties. Partial free energies, enthalpies and entropies of YBa 2 Cu 3 O 7−x have been obtained from oxygen standard potential measurements performed between 700 and 1100 K, by means of a miniaturized solid state galvanic cell. The oxygen molar content of the phases investigated was between 6.65 and 6.95. Oxygen diffusion kinetics was also studied by means of the same apparatus, by following the depolarization of the electrode after a coulometric titration. Structural characterization was performed by X-ray powder diffraction, metallography and scanning electron microscopy.
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