Materials Data on Th2Se5 by Materials Project
Th2Se5 crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. Th4+ is bonded in a 10-coordinate geometry to ten Se+1.60- atoms. There are a spread of Th–Se bond distances ranging from 3.03–3.24 Å. There are three inequivalent Se+1.60- sites. In the first Se+1.60- site, Se+1.60- is bonded in a 4-coordinate geometry to four equivalent Th4+ and one Se+1.60- atom. The Se–Se bond length is 2.91 Å. In the second Se+1.60- site, Se+1.60- is bonded in a 6-coordinate geometry to four equivalent Th4+ and two Se+1.60- atoms. The Se–Se bond length is 2.59 Å. In the third Se+1.60- site, Se+1.60- is bonded to four equivalent Th4+ atoms to form distorted corner-sharing SeTh4 trigonal pyramids.
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