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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on La5(AlBr)4 by Materials Project

La5(AlBr)4 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent La sites. In the first La site, La is bonded in a distorted linear geometry to eight equivalent Al and two equivalent Br atoms. All La–Al bond lengths are 3.26 Å. Both La–Br bond lengths are 3.16 Å. In the second La site, La is bonded in a 6-coordinate geometry to four equivalent Al and five Br atoms. There are a spread of La–Al bond distances ranging from 3.15–3.37 Å. There are a spread of La–Br bond distances ranging from 3.15–3.45 Å. Al is bonded in a 9-coordinate geometry to six La and three equivalent Al atoms. There are two shorter (2.67 Å) and one longer (2.81 Å) Al–Al bond lengths. There are two inequivalent Br sites. In the first Br site, Br is bonded to six equivalent La atoms to form distorted BrLa6 pentagonal pyramids that share corners with four equivalent BrLa5 square pyramids, edges with four equivalent BrLa6 pentagonal pyramids, edges with four equivalent BrLa5 square pyramids, and a faceface with one BrLa6 pentagonal pyramid. In the second Br site, Br is bonded to five La atoms to form BrLa5 square pyramids that share corners with four equivalent BrLa6 pentagonal pyramids, corners with five equivalent BrLa5 square pyramids, and edges with four equivalent BrLa6 pentagonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La(AlBr4)3 by Materials Project

La(AlBr4)3 crystallizes in the trigonal P3_121 space group. The structure is one-dimensional and consists of one La(AlBr4)3 ribbon oriented in the (0, 0, 1) direction. La3+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of La–Br bond distances ranging from 3.02–3.20 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded in a tetrahedral geometry to four Br1- atoms. There are a spread of Al–Br bond distances ranging from 2.27–2.41 Å. In the second Al3+ site, Al3+ is bonded in a tetrahedral geometry to four Br1- atoms. There are two shorter (2.33 Å) and two longer (2.34 Å) Al–Br bond lengths. There are six inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a single-bond geometry to one Al3+ atom. In the second Br1- site, Br1- is bonded in a distorted L-shaped geometry to one La3+ and one Al3+ atom. In the third Br1- site, Br1- is bonded in an L-shaped geometry to one La3+ and one Al3+ atom. In the fourth Br1- site, Br1- is bonded in a single-bond geometry to one Al3+ atom. In the fifth Br1- site, Br1- is bonded in a distorted L-shaped geometry to one La3+ and one Al3+ atom. In the sixth Br1- site, Br1- is bonded in a distorted L-shaped geometry to one La3+ and one Al3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La4Al5Br2 by Materials Project

La4Al5Br2 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. there are three inequivalent La sites. In the first La site, La is bonded in a 2-coordinate geometry to eight Al and two equivalent Br atoms. There are a spread of La–Al bond distances ranging from 3.22–3.43 Å. Both La–Br bond lengths are 3.18 Å. In the second La site, La is bonded in a 3-coordinate geometry to six Al and three Br atoms. There are a spread of La–Al bond distances ranging from 3.21–3.46 Å. There are one shorter (3.16 Å) and two longer (3.17 Å) La–Br bond lengths. In the third La site, La is bonded in a 1-coordinate geometry to ten Al and one Br atom. There are a spread of La–Al bond distances ranging from 3.30–3.56 Å. The La–Br bond length is 3.32 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 9-coordinate geometry to six La and three Al atoms. All Al–Al bond lengths are 2.57 Å. In the second Al site, Al is bonded in a 9-coordinate geometry to six La and three Al atoms. Both Al–Al bond lengths are 2.57 Å. In the third Al site, Al is bonded in a 9-coordinate geometry to six La and three Al atoms. The Al–Al bond length is 2.56 Å. There are two inequivalent Br sites. In the first Br site, Br is bonded in a rectangular see-saw-like geometry to four La atoms. In the second Br site, Br is bonded to five La atoms to form edge-sharing BrLa5 square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La10Al5Br4 by Materials Project

La10Al5Br4 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are three inequivalent La sites. In the first La site, La is bonded in a 1-coordinate geometry to five Al and one Br atom. There are one shorter (3.26 Å) and four longer (3.35 Å) La–Al bond lengths. The La–Br bond length is 3.22 Å. In the second La site, La is bonded in a 8-coordinate geometry to three equivalent Al and five Br atoms. There are one shorter (3.23 Å) and two longer (3.24 Å) La–Al bond lengths. There are a spread of La–Br bond distances ranging from 3.11–3.54 Å. In the third La site, La is bonded to five Al atoms to form a mixture of distorted corner and edge-sharing LaAl5 trigonal bipyramids. There are a spread of La–Al bond distances ranging from 3.33–3.45 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 9-coordinate geometry to eight La and one Al atom. The Al–Al bond length is 2.79 Å. In the second Al site, Al is bonded in a distorted q6 geometry to ten La atoms. There are two inequivalent Br sites. In the first Br site, Br is bonded in a 6-coordinate geometry to six equivalent La atoms. In the second Br site, Br is bonded to five La atoms to form corner-sharing BrLa5 square pyramids.

36 MATERIALS SCIENCE↗