Garnet-Like Structures of High-Pressure Cadmium Germanate and Calcium Germanate
- 24 January 1969
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 163 (3865) , 386-387
- https://doi.org/10.1126/science.163.3865.386
Abstract
Crystals of CdGeO3 grown at a pressure of 65 kilobars are tetragonal and have an ordered, garnet-like crystal structure with cadmium occupying the dodecahedral and octahedral sites, and germanium the octahedral and tetrahedral sites. The crystal structure (a = 12.406 ± 1 angstroms, c = 12.256 ± 1 angstroms, and space group 14,/a) has been refined by least-squares analysis to an R (discrepancy index) of 0.073. Two high-pressure phases of CaGeO3 were synthesized, one isotypic with tetragonal CdGeO3 (a = 12.514 ± 3 angstroms, c = 12.358 ± 3 angstroms), and the other isotypic with perovskite.Keywords
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