Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 10 (October 2013)


inorganic compounds



Acta Cryst. (2013). C69, 1091-1095    [ doi:10.1107/S0108270113025110 ]

The polar phase of Li2Ge4O9 at 298, 150 and 90 K

G. J. Redhammer and G. Tippelt

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.

Formula: Li2Ge4O9 at 298, 150 and 90 K

Keywords: crystal structure; lithium germanates.


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[ doi:10.1107/S0108270113025110/ku3106sup5.pdf ]
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[ doi:10.1107/S0108270113025110/ku3106sup6.pdf ]
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