Abstract
Regions of existence were determined for various types of poly- and monocrystalline solid solutions (Ln3[ScyM2−y]M3O12; {Ln3−xScx}[ScyM2−y]M3O12; Ln3[LnzScyM2−y−z] M3O12; Ln=Y, Gd; M=Ga, Al) by analyzing the diagrams rVIII−rVI (rVI are weighted mean dodecahedral and octahedral radii, respectively). We found the position of congruently melting compositions in rVIII−rVI coordinates and optimal compositions for obtaining Nd3+- and Cr3+-doped crystals. The structure of the congruently melting composition was found to be formed of “equilibrium” polyhedra, which need not be stabilized. It is shown that a congruently melting composition, which is absent in the original matrix, may be achieved by isomorphous substitutions at certain positions of the structure. The most probable mechanisms of formation of poly- and monocrystalline solid solutions with garnet structure are suggested using the calculated binodal curves of decomposition.
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