Title: Materials Data on La4(TmS2)11 by Materials Project

Abstract

La4(TmS2)11 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are six inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded to seven S2- atoms to form distorted TmS7 pentagonal bipyramids that share corners with three TmS6 octahedra, edges with two equivalent TmS6 octahedra, and edges with four equivalent TmS7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 40–50°. There are a spread of Tm–S bond distances ranging from 2.68–2.87 Å. In the second Tm3+ site, Tm3+ is bonded to six S2- atoms to form a mixture of edge and corner-sharing TmS6 octahedra. The corner-sharing octahedra tilt angles range from 49–59°. There are a spread of Tm–S bond distances ranging from 2.64–2.76 Å. In the third Tm3+ site, Tm3+ is bonded to six S2- atoms to form TmS6 octahedra that share corners with three equivalent TmS6 octahedra, corners with two equivalent TmS7 pentagonal bipyramids, and edges with four TmS6 octahedra. The corner-sharing octahedra tilt angles range from 51–63°. There are a spread of Tm–S bond distances ranging from 2.64–2.78 Å. In the fourth Tm3+ site, Tm3+ is bonded to six S2- atoms to form TmS6 octahedra that share corners with three equivalent TmS6 octahedra,more » a cornercorner with one TmS7 pentagonal bipyramid, edges with four equivalent TmS6 octahedra, and edges with two equivalent TmS7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 51–63°. There are a spread of Tm–S bond distances ranging from 2.65–2.76 Å. In the fifth Tm3+ site, Tm3+ is bonded to six S2- atoms to form a mixture of edge and corner-sharing TmS6 octahedra. The corner-sharing octahedra tilt angles range from 49–59°. There are a spread of Tm–S bond distances ranging from 2.64–2.76 Å. In the sixth Tm3+ site, 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 55°. There are four shorter (2.71 Å) and two longer (2.72 Å) Tm–S bond lengths. There are two inequivalent La+2.75+ sites. In the first La+2.75+ site, La+2.75+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.94–3.06 Å. In the second La+2.75+ site, La+2.75+ is bonded in a 7-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.92–3.47 Å. There are eleven inequivalent S2- sites. In the first S2- site, S2- is bonded to three Tm3+ and two equivalent La+2.75+ atoms to form distorted SLa2Tm3 trigonal bipyramids that share corners with two equivalent SLa2Tm3 square pyramids, corners with two equivalent SLa3Tm2 trigonal bipyramids, a cornercorner with one SLaTm3 trigonal pyramid, an edgeedge with one SLa2Tm3 square pyramid, and edges with five SLa2Tm3 trigonal bipyramids. In the second S2- site, S2- is bonded in a rectangular see-saw-like geometry to four Tm3+ atoms. In the third S2- site, S2- is bonded in a 3-coordinate geometry to three Tm3+ and one La+2.75+ atom. In the fourth S2- site, S2- is bonded to three Tm3+ and two equivalent La+2.75+ atoms to form distorted SLa2Tm3 square pyramids that share corners with six SLa2Tm3 trigonal bipyramids, corners with two equivalent SLaTm3 trigonal pyramids, edges with four SLa2Tm3 square pyramids, edges with two SLa2Tm3 trigonal bipyramids, and an edgeedge with one SLaTm3 trigonal pyramid. In the fifth S2- site, S2- is bonded to three Tm3+ and two equivalent La+2.75+ atoms to form distorted SLa2Tm3 square pyramids that share corners with two equivalent SLa2Tm3 square pyramids, corners with four SLa3Tm2 trigonal bipyramids, edges with five SLa2Tm3 square pyramids, an edgeedge with one SLa3Tm2 trigonal bipyramid, and edges with two equivalent SLaTm3 trigonal pyramids. In the sixth S2- site, S2- is bonded to three Tm3+ and two equivalent La+2.75+ atoms to form distorted SLa2Tm3 square pyramids that share corners with four SLa2Tm3 square pyramids, corners with two equivalent SLa3Tm2 trigonal bipyramids, corners with two equivalent SLaTm3 trigonal pyramids, edges with four SLa2Tm3 square pyramids, and edges with three SLa3Tm2 trigonal bipyramids. In the seventh S2- site, S2- is bonded to two equivalent Tm3+ and three La+2.75+ atoms to form distorted SLa3Tm2 trigonal bipyramids that share corners with six SLa2Tm3 square pyramids, edges with two SLa2Tm3 square pyramids, edges with six SLa2Tm3 trigonal bipyramids, and edges with two equivalent SLaTm3 trigonal pyramids. In the eighth S2- site, S2- is bonded to three Tm3+ and one La+2.75+ atom to form distorted SLaTm3 trigonal pyramids that share corners with four SLa2Tm3 square pyramids, corners with two SLa2Tm3 trigonal bipyramids, corners with two equivalent SLaTm3 trigonal pyramids, edges with three SLa2Tm3 square pyramids, and edges with two equivalent SLa3Tm2 trigonal bipyramids. In the ninth S2- site, S2- is bonded in a rectangular see-saw-like geometry to four Tm3+ atoms. In the tenth S2- site, S2- is bonded in a 4-coordinate geometry to four Tm3+ atoms. In the eleventh S2- site, S2- is bonded to two equivalent Tm3+ and three La+2.75+ atoms to form distorted SLa3Tm2 trigonal bipyramids that share corners with four SLa2Tm3 square pyramids, corners with two equivalent SLa2Tm3 trigonal bipyramids, a cornercorner with one SLaTm3 trigonal pyramid, edges with three SLa2Tm3 square pyramids, and edges with five SLa2Tm3 trigonal bipyramids.« less

Authors:

The Materials Project

Publication Date:

2020-05-02

Other Number(s):

mp-1204597

DOE Contract Number:  

AC02-05CH11231; EDCBEE

Research Org.:

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). LBNL Materials Project

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

Collaborations:

MIT; UC Berkeley; Duke; U Louvain

Subject:

36 MATERIALS SCIENCE

Keywords:

crystal structure; La4(TmS2)11; La-S-Tm

OSTI Identifier:

1711546

DOI:

https://doi.org/10.17188/1711546