DOI: 10.17188/1725634
title: Materials Data on Lu5Sc5(Si5Ir2)4 by Materials Project

description: Lu5Sc5(Ir2Si5)4 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are four inequivalent Lu3+ sites. In the first Lu3+ site, Lu3+ is bonded to eight Si+2.80- atoms to form distorted LuSi8 hexagonal bipyramids that share corners with four equivalent IrSi5 trigonal bipyramids, edges with four equivalent ScSi12 cuboctahedra, faces with two equivalent LuSi8 hexagonal bipyramids, and faces with four equivalent IrSi5 trigonal bipyramids. There are a spread of Lu–Si bond distances ranging from 2.84–3.05 Å. In the second Lu3+ site, Lu3+ is bonded to eight Si+2.80- atoms to form distorted LuSi8 hexagonal bipyramids that share corners with four equivalent IrSi5 trigonal bipyramids, edges with four equivalent ScSi12 cuboctahedra, faces with two equivalent LuSi8 hexagonal bipyramids, and faces with four equivalent IrSi5 trigonal bipyramids. There are a spread of Lu–Si bond distances ranging from 2.85–3.05 Å. In the third Lu3+ site, Lu3+ is bonded to eight Si+2.80- atoms to form distorted LuSi8 hexagonal bipyramids that share corners with four IrSi5 trigonal bipyramids, edges with four equivalent ScSi12 cuboctahedra, faces with two equivalent LuSi8 hexagonal bipyramids, and faces with four IrSi5 trigonal bipyramids. There are a spread of Lu–Si bond distances ranging from 2.85–3.05 Å. In the fourth Lu3+ site, Lu3+ is bonded in a 10-coordinate geometry to ten Si+2.80- atoms. There are a spread of Lu–Si bond distances ranging from 3.14–3.27 Å. There are three inequivalent Sc3+ sites. In the first Sc3+ site, Sc3+ is bonded in a 10-coordinate geometry to ten Si+2.80- atoms. There are a spread of Sc–Si bond distances ranging from 3.12–3.25 Å. In the second Sc3+ site, Sc3+ is bonded in a 10-coordinate geometry to ten Si+2.80- atoms. There are a spread of Sc–Si bond distances ranging from 3.11–3.24 Å. In the third Sc3+ site, Sc3+ is bonded to twelve Si+2.80- atoms to form distorted ScSi12 cuboctahedra that share corners with eight IrSi5 trigonal bipyramids, edges with eight LuSi8 hexagonal bipyramids, faces with two equivalent ScSi12 cuboctahedra, and faces with four IrSi5 trigonal bipyramids. There are a spread of Sc–Si bond distances ranging from 2.80–3.23 Å. There are four inequivalent Ir+3.25+ sites. In the first Ir+3.25+ site, Ir+3.25+ is bonded to five Si+2.80- atoms to form distorted IrSi5 trigonal bipyramids that share corners with two equivalent ScSi12 cuboctahedra, corners with two equivalent LuSi8 hexagonal bipyramids, corners with five IrSi5 trigonal bipyramids, a faceface with one ScSi12 cuboctahedra, and faces with two equivalent LuSi8 hexagonal bipyramids. There are a spread of Ir–Si bond distances ranging from 2.37–2.48 Å. In the second Ir+3.25+ site, Ir+3.25+ is bonded to five Si+2.80- atoms to form distorted IrSi5 trigonal bipyramids that share corners with two equivalent ScSi12 cuboctahedra, corners with two equivalent LuSi8 hexagonal bipyramids, corners with five IrSi5 trigonal bipyramids, a faceface with one ScSi12 cuboctahedra, and faces with two equivalent LuSi8 hexagonal bipyramids. There are a spread of Ir–Si bond distances ranging from 2.36–2.48 Å. In the third Ir+3.25+ site, Ir+3.25+ is bonded to five Si+2.80- atoms to form distorted IrSi5 trigonal bipyramids that share corners with two equivalent ScSi12 cuboctahedra, corners with two equivalent LuSi8 hexagonal bipyramids, corners with five IrSi5 trigonal bipyramids, a faceface with one ScSi12 cuboctahedra, and faces with two equivalent LuSi8 hexagonal bipyramids. There are a spread of Ir–Si bond distances ranging from 2.36–2.47 Å. In the fourth Ir+3.25+ site, Ir+3.25+ is bonded to five Si+2.80- atoms to form distorted IrSi5 trigonal bipyramids that share corners with two equivalent ScSi12 cuboctahedra, corners with two equivalent LuSi8 hexagonal bipyramids, corners with five IrSi5 trigonal bipyramids, a faceface with one ScSi12 cuboctahedra, and faces with two equivalent LuSi8 hexagonal bipyramids. There are a spread of Ir–Si bond distances ranging from 2.36–2.46 Å. There are eleven inequivalent Si+2.80- sites. In the first Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to two equivalent Lu3+, four equivalent Sc3+, two equivalent Ir+3.25+, and one Si+2.80- atom. The Si–Si bond length is 2.29 Å. In the second Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to two equivalent Lu3+, four equivalent Sc3+, two equivalent Ir+3.25+, and one Si+2.80- atom. In the third Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to four Lu3+, two equivalent Sc3+, two Ir+3.25+, and one Si+2.80- atom. The Si–Si bond length is 2.31 Å. In the fourth Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to two equivalent Lu3+, three Sc3+, and two Ir+3.25+ atoms. In the fifth Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to two equivalent Lu3+, three Sc3+, and two Ir+3.25+ atoms. In the sixth Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to two equivalent Lu3+, three Sc3+, and two Ir+3.25+ atoms. In the seventh Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to four Lu3+, one Sc3+, and two Ir+3.25+ atoms. In the eighth Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to two Lu3+, two equivalent Sc3+, two equivalent Ir+3.25+, and two Si+2.80- atoms. There are one shorter (2.65 Å) and one longer (2.68 Å) Si–Si bond lengths. In the ninth Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to one Lu3+, three Sc3+, two equivalent Ir+3.25+, and two Si+2.80- atoms. There are one shorter (2.67 Å) and one longer (2.68 Å) Si–Si bond lengths. In the tenth Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to one Lu3+, three Sc3+, two equivalent Ir+3.25+, and two Si+2.80- atoms. In the eleventh Si+2.80- site, Si+2.80- is bonded in a 2-coordinate geometry to one Lu3+, three Sc3+, two equivalent Ir+3.25+, and two Si+2.80- atoms.