Materials Data on Na2GeO3 by Materials Project

Abstract

Na2GeO3 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with four equivalent GeO4 tetrahedra, corners with five equivalent NaO5 trigonal bipyramids, an edgeedge with one GeO4 tetrahedra, and edges with four equivalent NaO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.32–2.67 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent GeO4 tetrahedra, corners with eight equivalent NaO5 trigonal bipyramids, and edges with two equivalent NaO5 trigonal bipyramids. There are a spread of Ge–O bond distances ranging from 1.74–1.85 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Na1+ and two equivalent Ge4+ atoms to form distorted corner-sharing ONa2Ge2 trigonal pyramids. In the second O2- site, O2- is bonded in a 5-coordinate geometry to four equivalent Na1+ and one Ge4+ atom.