Materials Data on ThSiO4 by Materials Project
ThSiO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Th4+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Th–O bond distances ranging from 2.40–2.85 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is three shorter (1.64 Å) and one longer (1.65 Å) Si–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Th4+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Th4+ and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Th4+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Th4+ and one Si4+ atom.