Materials Data on SmAgS2 by Materials Project

Abstract

SmAgS2 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are four inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded to six S2- atoms to form SmS6 octahedra that share corners with four equivalent SmS6 octahedra, a cornercorner with one AgS5 trigonal bipyramid, edges with four SmS6 octahedra, and edges with six AgS5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 20–25°. There are a spread of Sm–S bond distances ranging from 2.79–2.84 Å. In the second Sm3+ site, Sm3+ is bonded to six S2- atoms to form SmS6 octahedra that share corners with four equivalent SmS6 octahedra, corners with two AgS5 trigonal bipyramids, edges with four SmS6 octahedra, and edges with four AgS5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 20–25°. There are a spread of Sm–S bond distances ranging from 2.79–2.85 Å. In the third Sm3+ site, Sm3+ is bonded to six S2- atoms to form SmS6 octahedra that share corners with four equivalent SmS6 octahedra, corners with three AgS5 trigonal bipyramids, edges with four SmS6 octahedra, and edges with four AgS5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 20–25°. There are a spread of Sm–S bond distances ranging from 2.79–2.84 Å. In the fourth Sm3+ site, Sm3+ is bonded to six S2- atoms to form SmS6 octahedra that share corners with four equivalent SmS6 octahedra, corners with three AgS5 trigonal bipyramids, edges with four SmS6 octahedra, and edges with four equivalent AgS5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 20–24°. There are a spread of Sm–S bond distances ranging from 2.79–2.84 Å. There are four inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded to five S2- atoms to form distorted AgS5 trigonal bipyramids that share corners with three SmS6 octahedra, corners with two AgS5 trigonal bipyramids, edges with six SmS6 octahedra, and an edgeedge with one AgS5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 13–77°. There are a spread of Ag–S bond distances ranging from 2.44–3.28 Å. In the second Ag1+ site, Ag1+ is bonded in a 5-coordinate geometry to five S2- atoms. There are a spread of Ag–S bond distances ranging from 2.45–3.32 Å. In the third Ag1+ site, Ag1+ is bonded to five S2- atoms to form distorted AgS5 trigonal bipyramids that share corners with three SmS6 octahedra, corners with five AgS5 trigonal bipyramids, edges with six SmS6 octahedra, and an edgeedge with one AgS5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 11–77°. There are a spread of Ag–S bond distances ranging from 2.44–3.29 Å. In the fourth Ag1+ site, Ag1+ is bonded to five S2- atoms to form distorted AgS5 trigonal bipyramids that share corners with three SmS6 octahedra, corners with five AgS5 trigonal bipyramids, and edges with six SmS6 octahedra. The corner-sharing octahedra tilt angles range from 11–78°. There are a spread of Ag–S bond distances ranging from 2.44–3.30 Å. There are eight inequivalent S2- sites. In the first S2- site, S2- is bonded in a 6-coordinate geometry to three Sm3+ and three Ag1+ atoms. In the second S2- site, S2- is bonded to three Sm3+ and two equivalent Ag1+ atoms to form a mixture of distorted corner and edge-sharing SSm3Ag2 square pyramids. In the third S2- site, S2- is bonded to three Sm3+ and two Ag1+ atoms to form a mixture of distorted corner and edge-sharing SSm3Ag2 square pyramids. In the fourth S2- site, S2- is bonded in a 6-coordinate geometry to three Sm3+ and three Ag1+ atoms. In the fifth S2- site, S2- is bonded to three Sm3+ and two Ag1+ atoms to form a mixture of distorted corner and edge-sharing SSm3Ag2 square pyramids. In the sixth S2- site, S2- is bonded in a 6-coordinate geometry to three Sm3+ and three Ag1+ atoms. In the seventh S2- site, S2- is bonded to three Sm3+ and two equivalent Ag1+ atoms to form a mixture of distorted corner and edge-sharing SSm3Ag2 square pyramids. In the eighth S2- site, S2- is bonded in a 6-coordinate geometry to three Sm3+ and three Ag1+ atoms.