Acta Cryst. (2013). C69, 1091-1095 [ doi:10.1107/S0108270113025110 ]
Abstract: Dilithium tetragermanate is orthorhombic, space group P21ca, at 298 K, and is thus in a polar and probably a ferroelectric state. The structure contains two independent Li, four Ge and nine O atoms, all on general positions with site symmetry 1. Three tetrahedrally coordinated Ge positions form crumpled crankshaft-like chains, forming sheets within the ac plane, and these are interconnected by the fourth, octahedrally coordinated, Ge sites along the b direction. The GeO4 tetrahedra and GeO6 octahedra form a three-dimensional framework containing two different cavities, hosting the two 4+1-coordinated Li sites. Cooling to 90 K does not alter the space-group symmetry; the tetrahedral chains behave as a rigid unit and changes occur mainly within the Li coordination spheres.
CCDC references: 960142, 960143 and 960144
Formula: Li2Ge4O9 at 298, 150 and 90 K
Keywords: crystal structure; lithium germanates.
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