Abstract
AbstractUsing e.m.f. measurements we determined relative oxygen ion concentrations of the systems PbO—PbF2—B2O3, PbO—MoO3—B2O3, PbO—Bi2O3—V2O5, 3 PbO · MoO3—Fe2O3, and 3 PbO · MoO3—Ga2O3. Furthermore the alteration of the relative oxygen ion concentration of pure PbO was observed after stepwise addition of the solvent components PbF2, B2O3 and of the garnet forming oxides Fe2O3 and Y2O3 giving complete high temperature solutions for the Y3Fe5O12 preparation. Applying the Lux' acid‐base concept the behaviour of these oxide mixtures is discussed. Combinations which contain weak bases and weak acids allow the adjustment of a desired oxygen ion concentration that is little changed by added oxides for crystal growth. These combinations show favourable properties as solvents for oxidic substances with complicated compositions, e.g. perovskites, garnets, ferrites.
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