Materials Data on SiO2 by Materials Project

Abstract

SiO2 crystallizes in the monoclinic C2 space group. The structure is two-dimensional and consists of one SiO2 sheet oriented in the (0, 0, 1) direction. there are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of Si–O bond distances ranging from 1.53–1.64 Å. In the second Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.63 Å) and two longer (1.64 Å) Si–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Si4+ atom. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to two Si4+ atoms. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to two Si4+ atoms.