Abstract

On the basis of the ( T, x) phase diagrams of oxygen ordering, the amounts of transferred holes n h as a function of x are calculated for pure as well as for doped samples of YBa 2Cu 3O 6+ x and Y 2Ba 4Cu 7O 14+ x . These calculations allow us to anticipate the behavior of the superconducting temperature T c ( x). In pure Y 2Ba 4Cu 7O 14+ x a small kink is observed in n h ( x) at x = 0.5, instead of the plateau characteristic to YBa 2Cu 3O 6+ x . Substitution of Cu in the basal plane by Al or removing Cu without substitution also leads to a smearing of the plateau.

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