Abstract

The structure of trigadolinium gallate, Gd 3 GaO 6 , was solved ab initio from conventional X-ray powder diffraction data. Gd 3 GaO 6 has a non-centrosymmetric orthorhombic structure (Cmc2 1 ). The structure was refined by the Rietveld method, showing that the Gd atoms are in two different sites of sevenfold coordination and that the Ga atoms are in distorted oxygen tetrahedra. Gd 3 GaO 6 was found to be isotypic with Er 3 GaS 6 .

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