Materials Data on TmU2S3O2 by Materials Project

Abstract

U2TmS3O2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. U+3.50+ is bonded in a 4-coordinate geometry to four equivalent S2- and four equivalent O2- atoms. All U–S bond lengths are 2.95 Å. All U–O bond lengths are 2.33 Å. Tm3+ is bonded to six S2- atoms to form a mixture of edge and corner-sharing TmS6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Tm–S bond lengths are 2.68 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 1-coordinate geometry to four equivalent U+3.50+ and one Tm3+ atom. In the second S2- site, S2- is bonded in a square co-planar geometry to four equivalent Tm3+ atoms. O2- is bonded to four equivalent U+3.50+ atoms to form a mixture of edge and corner-sharing OU4 tetrahedra.