Abstract
AbstractFor the preparation and transformation sequence in the system Y4O3–Al2O3 the sintering of homogeneously mixed oxide powders was chosen. The constituents of the Y4Al2O9 phase were determined by quantitative phase analysis with the method of inner standards. Corresponding gauge curves for the conditions of the temperatures of sintering were drawn.At low temperatures appears as first in the whole molar range the (2:1) phase, i.e. Y4Al2O9. With increasing temperature and sintering time the yield of this mixed crystal phase depends on the concentration of the oxide components in the powder mixture of the start materials.In flux mixtures of the components PbO, PbF2, and B2O3 and despite suitable nucleation it was not possible to obtain this compound. In the melt the compound Y4Al2O9 was prepared frequently in near molar conditions. Also a glass was prepared with (2:1) stoichiometry. Single crystals were identified by X‐rays.
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