Strontium Metagermanate, SrGeO₃

This form of strontium germanium trioxide has the same structure as that reported by Hilmer [Sov. Phys. Crystallogr. (1963). 7(5), 573-576] except that it has monoclinic rather than hexagonal symmetry. Two forms of SrGeO₃ are known at present: this monoclnic form and a triclinic form reported by Nadezhina, Pobedimskaya, Ilyukhin & Belov [Sov. Phys. Crystallogr. (1981), 26(1), 27-32; 26(3), 268-271]. The present structure has alternate stacking of ternary rings of GeO₄ groups and close-packed Sr atoms along [001], and is a six-layer polytype.

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