Tetragermanates of Strontium, Lead, and Barium of Formula Type AB4Q9.
- 1 March 1961
- journal article
- Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Vol. 65 (2) , 127-131
- https://doi.org/10.6028/jres.065A.016
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.Keywords
This publication has 0 references indexed in Scilit: