Materials Data on NaGa(GeO3)2 by Materials Project

Abstract

NaGa(GeO3)2 is Esseneite structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.43–2.83 Å. Ga3+ is bonded to six O2- atoms to form GaO6 octahedra that share corners with six equivalent GeO4 tetrahedra and edges with two equivalent GaO6 octahedra. There are a spread of Ga–O bond distances ranging from 1.95–2.11 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three equivalent GaO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 40–62°. There are a spread of Ge–O bond distances ranging from 1.74–1.79 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to one Na1+, one Ga3+, and one Ge4+ atom. In the second O2- site, O2- is bonded to one Na1+, two equivalent Ga3+, and one Ge4+ atom to form a mixture of distorted corner and edge-sharing ONaGa2Ge tetrahedra. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Na1+ and two equivalent Ge4+ atoms.