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Title: Materials Data on Sm6Al39Cr8 by Materials Project

Abstract

Sm6Cr8Al39 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. Sm is bonded in a 6-coordinate geometry to one Sm, three Cr, and thirteen Al atoms. The Sm–Sm bond length is 3.45 Å. There are two shorter (3.24 Å) and one longer (3.52 Å) Sm–Cr bond lengths. There are a spread of Sm–Al bond distances ranging from 3.04–3.44 Å. There are three inequivalent Cr sites. In the first Cr site, Cr is bonded to twelve Al atoms to form CrAl12 cuboctahedra that share faces with six equivalent AlSm2Al9Cr cuboctahedra. There are six shorter (2.63 Å) and six longer (2.78 Å) Cr–Al bond lengths. In the second Cr site, Cr is bonded in a 10-coordinate geometry to two equivalent Sm and ten Al atoms. There are a spread of Cr–Al bond distances ranging from 2.46–2.76 Å. In the third Cr site, Cr is bonded to three equivalent Sm and nine Al atoms to form CrSm3Al9 cuboctahedra that share corners with three equivalent CrSm3Al9 cuboctahedra, edges with three equivalent AlSm2Al9Cr cuboctahedra, faces with two equivalent CrSm3Al9 cuboctahedra, and faces with three equivalent AlSm2Al9Cr cuboctahedra. There are a spread of Cr–Al bond distances ranging from 2.64–2.80 Å. There are six inequivalentmore » Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Sm, two Cr, and eight Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–3.12 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to four equivalent Sm, two equivalent Cr, and six Al atoms. There are two shorter (2.75 Å) and two longer (2.78 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a 12-coordinate geometry to two equivalent Sm, three Cr, and seven Al atoms. There are one shorter (2.90 Å) and two longer (3.01 Å) Al–Al bond lengths. In the fourth Al site, Al is bonded in a 2-coordinate geometry to two equivalent Cr and ten Al atoms. There are two shorter (2.85 Å) and four longer (2.88 Å) Al–Al bond lengths. In the fifth Al site, Al is bonded to two equivalent Sm, one Cr, and nine Al atoms to form distorted AlSm2Al9Cr cuboctahedra that share a cornercorner with one AlSm2Al9Cr cuboctahedra, an edgeedge with one AlSm2Al9Cr cuboctahedra, edges with two equivalent CrSm3Al9 cuboctahedra, faces with three CrAl12 cuboctahedra, and faces with four equivalent AlSm2Al9Cr cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.73–2.92 Å. In the sixth Al site, Al is bonded in a 12-coordinate geometry to one Sm, two Cr, and nine Al atoms. Both Al–Al bond lengths are 2.93 Å.« less

Authors:
Publication Date:
Other Number(s):
mp-1209105
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; Sm6Al39Cr8; Al-Cr-Sm
OSTI Identifier:
1742006
DOI:
https://doi.org/10.17188/1742006

Citation Formats

The Materials Project. Materials Data on Sm6Al39Cr8 by Materials Project. United States: N. p., 2020. Web. doi:10.17188/1742006.
The Materials Project. Materials Data on Sm6Al39Cr8 by Materials Project. United States. doi:https://doi.org/10.17188/1742006
The Materials Project. 2020. "Materials Data on Sm6Al39Cr8 by Materials Project". United States. doi:https://doi.org/10.17188/1742006. https://www.osti.gov/servlets/purl/1742006. Pub date:Wed Apr 29 00:00:00 EDT 2020
@article{osti_1742006,
title = {Materials Data on Sm6Al39Cr8 by Materials Project},
author = {The Materials Project},
abstractNote = {Sm6Cr8Al39 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. Sm is bonded in a 6-coordinate geometry to one Sm, three Cr, and thirteen Al atoms. The Sm–Sm bond length is 3.45 Å. There are two shorter (3.24 Å) and one longer (3.52 Å) Sm–Cr bond lengths. There are a spread of Sm–Al bond distances ranging from 3.04–3.44 Å. There are three inequivalent Cr sites. In the first Cr site, Cr is bonded to twelve Al atoms to form CrAl12 cuboctahedra that share faces with six equivalent AlSm2Al9Cr cuboctahedra. There are six shorter (2.63 Å) and six longer (2.78 Å) Cr–Al bond lengths. In the second Cr site, Cr is bonded in a 10-coordinate geometry to two equivalent Sm and ten Al atoms. There are a spread of Cr–Al bond distances ranging from 2.46–2.76 Å. In the third Cr site, Cr is bonded to three equivalent Sm and nine Al atoms to form CrSm3Al9 cuboctahedra that share corners with three equivalent CrSm3Al9 cuboctahedra, edges with three equivalent AlSm2Al9Cr cuboctahedra, faces with two equivalent CrSm3Al9 cuboctahedra, and faces with three equivalent AlSm2Al9Cr cuboctahedra. There are a spread of Cr–Al bond distances ranging from 2.64–2.80 Å. There are six inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Sm, two Cr, and eight Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–3.12 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to four equivalent Sm, two equivalent Cr, and six Al atoms. There are two shorter (2.75 Å) and two longer (2.78 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a 12-coordinate geometry to two equivalent Sm, three Cr, and seven Al atoms. There are one shorter (2.90 Å) and two longer (3.01 Å) Al–Al bond lengths. In the fourth Al site, Al is bonded in a 2-coordinate geometry to two equivalent Cr and ten Al atoms. There are two shorter (2.85 Å) and four longer (2.88 Å) Al–Al bond lengths. In the fifth Al site, Al is bonded to two equivalent Sm, one Cr, and nine Al atoms to form distorted AlSm2Al9Cr cuboctahedra that share a cornercorner with one AlSm2Al9Cr cuboctahedra, an edgeedge with one AlSm2Al9Cr cuboctahedra, edges with two equivalent CrSm3Al9 cuboctahedra, faces with three CrAl12 cuboctahedra, and faces with four equivalent AlSm2Al9Cr cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.73–2.92 Å. In the sixth Al site, Al is bonded in a 12-coordinate geometry to one Sm, two Cr, and nine Al atoms. Both Al–Al bond lengths are 2.93 Å.},
doi = {10.17188/1742006},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {4}
}