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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba2YI7 by Materials Project

Ba2YI7 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two Ba2YI7 sheets oriented in the (0, 1, 0) direction. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to seven I1- atoms to form distorted BaI7 pentagonal bipyramids that share a cornercorner with one YI6 octahedra, an edgeedge with one YI6 octahedra, and a faceface with one YI6 octahedra. The corner-sharing octahedral tilt angles are 44°. There are a spread of Ba–I bond distances ranging from 3.30–3.76 Å. In the second Ba2+ site, Ba2+ is bonded in a 7-coordinate geometry to seven I1- atoms. There are a spread of Ba–I bond distances ranging from 3.43–3.77 Å. Y3+ is bonded to six I1- atoms to form YI6 octahedra that share a cornercorner with one BaI7 pentagonal bipyramid, an edgeedge with one BaI7 pentagonal bipyramid, and a faceface with one BaI7 pentagonal bipyramid. There are a spread of Y–I bond distances ranging from 3.04–3.13 Å. There are seven inequivalent I1- sites. In the first I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the second I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the third I1- site, I1- is bonded in a distorted T-shaped geometry to two Ba2+ and one Y3+ atom. In the fourth I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the fifth I1- site, I1- is bonded in an L-shaped geometry to two Ba2+ atoms. In the sixth I1- site, I1- is bonded in a distorted T-shaped geometry to two Ba2+ and one Y3+ atom. In the seventh I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2YI7 by Materials Project

Ba2YI7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six I1- atoms. There are a spread of Ba–I bond distances ranging from 3.32–3.76 Å. In the second Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six I1- atoms. There are a spread of Ba–I bond distances ranging from 3.33–3.86 Å. Y3+ is bonded in an octahedral geometry to six I1- atoms. There are a spread of Y–I bond distances ranging from 3.00–3.13 Å. There are seven inequivalent I1- sites. In the first I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the second I1- site, I1- is bonded in an L-shaped geometry to one Ba2+ and one Y3+ atom. In the third I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the fourth I1- site, I1- is bonded in an L-shaped geometry to one Ba2+ and one Y3+ atom. In the fifth I1- site, I1- is bonded in a bent 120 degrees geometry to one Ba2+ and one Y3+ atom. In the sixth I1- site, I1- is bonded in a 4-coordinate geometry to three Ba2+ and one Y3+ atom. In the seventh I1- site, I1- is bonded in a distorted bent 150 degrees geometry to two Ba2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2YI7 by Materials Project

Ba2YI7 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to seven I1- atoms to form distorted BaI7 pentagonal bipyramids that share corners with two equivalent YI6 pentagonal pyramids, edges with two equivalent BaI7 pentagonal bipyramids, edges with two equivalent YI6 pentagonal pyramids, and a faceface with one BaI7 pentagonal bipyramid. There are a spread of Ba–I bond distances ranging from 3.35–3.60 Å. In the second Ba2+ site, Ba2+ is bonded to seven I1- atoms to form distorted BaI7 pentagonal bipyramids that share corners with two equivalent YI6 pentagonal pyramids, edges with two equivalent BaI7 pentagonal bipyramids, edges with two equivalent YI6 pentagonal pyramids, and a faceface with one BaI7 pentagonal bipyramid. There are a spread of Ba–I bond distances ranging from 3.32–3.64 Å. Y3+ is bonded to six I1- atoms to form distorted YI6 pentagonal pyramids that share corners with four BaI7 pentagonal bipyramids and edges with four BaI7 pentagonal bipyramids. There are a spread of Y–I bond distances ranging from 3.05–3.12 Å. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in an L-shaped geometry to two Ba2+ atoms. In the second I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to two Ba2+ and one Y3+ atom. In the third I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to two Ba2+ and one Y3+ atom. In the fourth I1- site, I1- is bonded in a distorted T-shaped geometry to two Ba2+ and one Y3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2YI7 by Materials Project

Ba2YI7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine I1- atoms. There are a spread of Ba–I bond distances ranging from 3.55–3.86 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine I1- atoms. There are a spread of Ba–I bond distances ranging from 3.56–3.86 Å. Y3+ is bonded in a distorted pentagonal bipyramidal geometry to seven I1- atoms. There are a spread of Y–I bond distances ranging from 3.09–3.24 Å. There are seven inequivalent I1- sites. In the first I1- site, I1- is bonded in a 1-coordinate geometry to two Ba2+ and one Y3+ atom. In the second I1- site, I1- is bonded to three Ba2+ and one Y3+ atom to form a mixture of distorted corner and edge-sharing IBa3Y tetrahedra. In the third I1- site, I1- is bonded to three Ba2+ and one Y3+ atom to form a mixture of corner and edge-sharing IBa3Y tetrahedra. In the fourth I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to two Ba2+ and one Y3+ atom. In the fifth I1- site, I1- is bonded to three Ba2+ and one Y3+ atom to form a mixture of corner and edge-sharing IBa3Y tetrahedra. In the sixth I1- site, I1- is bonded to three Ba2+ and one Y3+ atom to form a mixture of distorted corner and edge-sharing IBa3Y tetrahedra. In the seventh I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2YI7 by Materials Project

Ba2YI7 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight I1- atoms. There are a spread of Ba–I bond distances ranging from 3.52–4.14 Å. In the second Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight I1- atoms. There are a spread of Ba–I bond distances ranging from 3.50–3.80 Å. In the third Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight I1- atoms. There are a spread of Ba–I bond distances ranging from 3.49–3.91 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight I1- atoms. There are a spread of Ba–I bond distances ranging from 3.50–4.16 Å. There are two inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in an octahedral geometry to six I1- atoms. There are a spread of Y–I bond distances ranging from 3.02–3.07 Å. In the second Y3+ site, Y3+ is bonded in an octahedral geometry to six I1- atoms. There are a spread of Y–I bond distances ranging from 3.01–3.09 Å. There are fourteen inequivalent I1- sites. In the first I1- site, I1- is bonded in a 1-coordinate geometry to three Ba2+ and one Y3+ atom. In the second I1- site, I1- is bonded in a 1-coordinate geometry to three Ba2+ and one Y3+ atom. In the third I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the fourth I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the fifth I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the sixth I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the seventh I1- site, I1- is bonded in a 1-coordinate geometry to two Ba2+ and one Y3+ atom. In the eighth I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the ninth I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to three Ba2+ atoms. In the tenth I1- site, I1- is bonded in a distorted T-shaped geometry to three Ba2+ atoms. In the eleventh I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to two Ba2+ and one Y3+ atom. In the twelfth I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to two Ba2+ and one Y3+ atom. In the thirteenth I1- site, I1- is bonded in a 3-coordinate geometry to two Ba2+ and one Y3+ atom. In the fourteenth I1- site, I1- is bonded in a 2-coordinate geometry to two Ba2+ and one Y3+ atom.

36 MATERIALS SCIENCE↗