Materials Data on Na2SiO3 by Materials Project
Na2SiO3 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 SiO4 tetrahedra, corners with five equivalent NaO5 trigonal bipyramids, an edgeedge with one SiO4 tetrahedra, and edges with four equivalent NaO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.32–2.58 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent SiO4 tetrahedra, corners with eight equivalent NaO5 trigonal bipyramids, and edges with two equivalent NaO5 trigonal bipyramids. There are a spread of Si–O bond distances ranging from 1.62–1.70 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na1+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a 5-coordinate geometry to four equivalent Na1+ and one Si4+ atom.