Abstract
Phases of variable composition Ln3M5 – 2xGe1 + xBexO14 (Ln = La–Gd; M = Ga, Al, Fe, Cr) with the Ca3Ga2Ge4O14 (GGG) structure (space group P321) were prepared by solid-phase synthesis at 1100–1400°С. In Ga systems, GGG phases are formed for La–Eu; in Al systems, for La–Gd; for Fe, only in the La system; and in Cr systems, for La–Sm. Ln3CrGe3Be2O14 compounds have an ordered crystal structure with oxygen octahedra occupied by Cr3+ ions. The other phases have an M–Ge–Be disordered structure. The compounds are decomposed in a solid phase and (or) melt incongruently.
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