Materials Data on Y2SiO5 by Materials Project

Y2SiO5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.22–2.70 Å. In the second Y3+ site, Y3+ is bonded to six O2- atoms to form distorted YO6 octahedra that share corners with four equivalent SiO4 tetrahedra and edges with two equivalent YO6 octahedra. There are a spread of Y–O bond distances ranging from 2.23–2.32 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four equivalent YO6 octahedra. The corner-sharing octahedra tilt angles range from 43–66°. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Y3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Y3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Y3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded to four Y3+ atoms to form edge-sharing OY4 tetrahedra. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Y3+ and one Si4+ atom.