Materials Data on Ho5(Si5Ir2)2 by Materials Project
Ho5(Ir2Si5)2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are three inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded to twelve Si+3.20- atoms to form distorted HoSi12 cuboctahedra that share corners with eight equivalent IrSi5 trigonal bipyramids, edges with eight equivalent HoSi8 hexagonal bipyramids, faces with two equivalent HoSi12 cuboctahedra, and faces with four equivalent IrSi5 trigonal bipyramids. There are eight shorter (2.91 Å) and four longer (3.27 Å) Ho–Si bond lengths. In the second Ho3+ site, Ho3+ is bonded to eight Si+3.20- atoms to form distorted HoSi8 hexagonal bipyramids that share corners with four equivalent IrSi5 trigonal bipyramids, edges with four equivalent HoSi12 cuboctahedra, faces with two equivalent HoSi8 hexagonal bipyramids, and faces with four equivalent IrSi5 trigonal bipyramids. There are a spread of Ho–Si bond distances ranging from 2.89–3.03 Å. In the third Ho3+ site, Ho3+ is bonded in a distorted q4 geometry to ten Si+3.20- atoms. There are a spread of Ho–Si bond distances ranging from 3.19–3.24 Å. Ir+4.25+ is bonded to five Si+3.20- atoms to form distorted IrSi5 trigonal bipyramids that share corners with two equivalent HoSi12 cuboctahedra, corners with two equivalent HoSi8 hexagonal bipyramids, corners with five equivalent IrSi5 trigonal bipyramids, a faceface with one HoSi12 cuboctahedra, and faces with two equivalent HoSi8 hexagonal bipyramids. There are a spread of Ir–Si bond distances ranging from 2.39–2.50 Å. There are three inequivalent Si+3.20- sites. In the first Si+3.20- site, Si+3.20- is bonded in a 9-coordinate geometry to six Ho3+, two equivalent Ir+4.25+, and one Si+3.20- atom. The Si–Si bond length is 2.34 Å. In the second Si+3.20- site, Si+3.20- is bonded in a 2-coordinate geometry to five Ho3+, two equivalent Ir+4.25+, and one Si+3.20- atom. The Si–Si bond length is 2.42 Å. In the third Si+3.20- site, Si+3.20- is bonded in a 2-coordinate geometry to four Ho3+, two equivalent Ir+4.25+, and two equivalent Si+3.20- atoms. Both Si–Si bond lengths are 2.79 Å.
- Research Organization:
- LBNL Materials Project; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Contributing Organization:
- The Materials Project; MIT; UC Berkeley; Duke; U Louvain
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1728283
- Report Number(s):
- mp-1205124
- Country of Publication:
- United States
- Language:
- English
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