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Published on: December 29, 2016
Tetragermanates of Strontium, Lead, and Barium of Formula Type AB4Q9
Abstract:
Three new tetragermanates, SrGe4O9, PbGe4O9, and BaGe4O9, of formula type AB4O9 were found. BaTiGe3O9, the germanium analog of the mineral silicate benitoite (BaTiSi3O9) was prepared for study and comparison. Indexed X-ray powder diffraction patterns of the tetragermanates and of BaTiGe3O9 and BaTiSi3O9 show: (1) the tetragermanates are apparently isostructural; (2) the unit cell of BaTiGe3O9 at room temperature is related to that of the tetragermanates by a doubling of the c-axis of the latter; (3) the tetragermanates and the metastable (room temperature) form of BaTiGe3O9 are apparently structurally similar to, but not isostructural with benitoite; (4) within its temperature stability range, BaTiGe3O9 appears to be isostructural with BaTiSi3O9. Density, melting point, and partial optical data for the tetragermanates were obtained.
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