DOI: 10.17188/1187096
title: Materials Data on Ba4Nd2Cd3Se10 by Materials Project

description: Ba4Nd2Cd3Se10 crystallizes in the orthorhombic Cmc2_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 Se2- atoms. There are a spread of Ba–Se bond distances ranging from 3.31–3.78 Å. In the second Ba2+ site, Ba2+ is bonded to seven Se2- atoms to form distorted BaSe7 pentagonal bipyramids that share corners with two equivalent NdSe6 octahedra, corners with two equivalent BaSe7 pentagonal bipyramids, edges with three NdSe6 octahedra, edges with three equivalent BaSe7 pentagonal bipyramids, edges with four CdSe4 tetrahedra, and faces with two equivalent BaSe7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 17°. There are a spread of Ba–Se bond distances ranging from 3.29–3.45 Å. In the third Ba2+ site, Ba2+ is bonded to seven Se2- atoms to form distorted BaSe7 pentagonal bipyramids that share corners with two equivalent NdSe6 octahedra, corners with two equivalent BaSe7 pentagonal bipyramids, corners with five CdSe4 tetrahedra, corners with two equivalent CdSe4 trigonal pyramids, edges with three NdSe6 octahedra, edges with three equivalent BaSe7 pentagonal bipyramids, an edgeedge with one CdSe4 trigonal pyramid, and faces with two equivalent BaSe7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 22°. There are a spread of Ba–Se bond distances ranging from 3.30–3.51 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of Ba–Se bond distances ranging from 3.28–3.71 Å. There are two inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded to six Se2- atoms to form NdSe6 octahedra that share corners with two equivalent BaSe7 pentagonal bipyramids, edges with two equivalent NdSe6 octahedra, edges with three BaSe7 pentagonal bipyramids, edges with two equivalent CdSe4 tetrahedra, and edges with two equivalent CdSe4 trigonal pyramids. There are a spread of Nd–Se bond distances ranging from 2.96–3.04 Å. In the second Nd3+ site, Nd3+ is bonded to six Se2- atoms to form NdSe6 octahedra that share corners with two equivalent BaSe7 pentagonal bipyramids, corners with three equivalent CdSe4 tetrahedra, edges with two equivalent NdSe6 octahedra, and edges with three BaSe7 pentagonal bipyramids. There are three shorter (2.97 Å) and three longer (3.00 Å) Nd–Se bond lengths. There are three inequivalent Cd2+ sites. In the first Cd2+ site, Cd2+ is bonded to four Se2- atoms to form CdSe4 tetrahedra that share corners with three equivalent NdSe6 octahedra, corners with two equivalent BaSe7 pentagonal bipyramids, corners with three CdSe4 tetrahedra, and edges with two equivalent BaSe7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 6–73°. There are a spread of Cd–Se bond distances ranging from 2.61–2.81 Å. In the second Cd2+ site, Cd2+ is bonded to four Se2- atoms to form distorted CdSe4 trigonal pyramids that share corners with two equivalent BaSe7 pentagonal bipyramids, corners with two equivalent CdSe4 trigonal pyramids, edges with two equivalent NdSe6 octahedra, and an edgeedge with one BaSe7 pentagonal bipyramid. There are a spread of Cd–Se bond distances ranging from 2.58–2.84 Å. In the third Cd2+ site, Cd2+ is bonded to four Se2- atoms to form CdSe4 tetrahedra that share corners with three equivalent BaSe7 pentagonal bipyramids, corners with three CdSe4 tetrahedra, edges with two equivalent NdSe6 octahedra, and edges with two equivalent BaSe7 pentagonal bipyramids. There are a spread of Cd–Se bond distances ranging from 2.67–2.78 Å. There are ten inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three Ba2+ and two equivalent Nd3+ atoms to form distorted SeBa3Nd2 trigonal bipyramids that share corners with six SeBa4Cd square pyramids, corners with two equivalent SeBa3Nd2 trigonal bipyramids, edges with two equivalent SeBa4NdCd octahedra, edges with two SeBa2NdCd2 square pyramids, and edges with three SeBa3Nd2 trigonal bipyramids. In the second Se2- site, Se2- is bonded to three Ba2+ and two equivalent Nd3+ atoms to form distorted SeBa3Nd2 trigonal bipyramids that share corners with four equivalent SeBa4Cd2 octahedra, corners with two equivalent SeBa2NdCd2 square pyramids, corners with two equivalent SeBa3Nd2 trigonal bipyramids, edges with five SeBa4Cd2 octahedra, an edgeedge with one SeBa2NdCd2 square pyramid, and edges with three SeBa3Nd2 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 40–50°. In the third Se2- site, Se2- is bonded to two equivalent Ba2+, one Nd3+, and two equivalent Cd2+ atoms to form distorted SeBa2NdCd2 square pyramids that share corners with two equivalent SeBa4Cd2 octahedra, corners with three SeBa2NdCd2 square pyramids, corners with two equivalent SeBa3Nd2 trigonal bipyramids, edges with two equivalent SeBa3Nd2Cd octahedra, edges with three SeBa2NdCd2 square pyramids, and an edgeedge with one SeBa3Nd2 trigonal bipyramid. The corner-sharing octahedral tilt angles are 60°. In the fourth Se2- site, Se2- is bonded to two equivalent Ba2+, one Nd3+, and two equivalent Cd2+ atoms to form distorted SeBa2NdCd2 square pyramids that share corners with two equivalent SeBa4Cd2 octahedra, corners with three SeBa2NdCd2 square pyramids, corners with two equivalent SeBa3Nd2 trigonal bipyramids, edges with three SeBa4Cd2 octahedra, edges with two equivalent SeBa2NdCd2 square pyramids, and an edgeedge with one SeBa3Nd2 trigonal bipyramid. The corner-sharing octahedral tilt angles are 53°. In the fifth Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to two Ba2+, one Nd3+, and two equivalent Cd2+ atoms. In the sixth Se2- site, Se2- is bonded to four Ba2+ and one Cd2+ atom to form distorted SeBa4Cd square pyramids that share corners with two equivalent SeBa4NdCd octahedra, corners with four SeBa2NdCd2 square pyramids, corners with four equivalent SeBa3Nd2 trigonal bipyramids, an edgeedge with one SeBa4NdCd octahedra, edges with three SeBa2NdCd2 square pyramids, and an edgeedge with one SeBa3Nd2 trigonal bipyramid. The corner-sharing octahedral tilt angles are 41°. In the seventh Se2- site, Se2- is bonded to four Ba2+ and two Cd2+ atoms to form distorted SeBa4Cd2 octahedra that share corners with six SeBa4NdCd octahedra, corners with four SeBa2NdCd2 square pyramids, corners with four equivalent SeBa3Nd2 trigonal bipyramids, edges with two equivalent SeBa4Cd2 octahedra, an edgeedge with one SeBa2NdCd2 square pyramid, an edgeedge with one SeBa3Nd2 trigonal bipyramid, and faces with two SeBa4NdCd octahedra. The corner-sharing octahedra tilt angles range from 41–58°. In the eighth Se2- site, Se2- is bonded to four Ba2+, one Nd3+, and one Cd2+ atom to form SeBa4NdCd octahedra that share corners with four SeBa4Cd2 octahedra, corners with two equivalent SeBa4Cd square pyramids, edges with three SeBa4NdCd octahedra, an edgeedge with one SeBa4Cd square pyramid, edges with four SeBa3Nd2 trigonal bipyramids, and a faceface with one SeBa4Cd2 octahedra. The corner-sharing octahedra tilt angles range from 22–53°. In the ninth Se2- site, Se2- is bonded in a 6-coordinate geometry to three Ba2+, two equivalent Nd3+, and one Cd2+ atom. In the tenth Se2- site, Se2- is bonded to three Ba2+, two equivalent Nd3+, and one Cd2+ atom to form distorted SeBa3Nd2Cd octahedra that share corners with six SeBa4Cd2 octahedra, edges with three SeBa4NdCd octahedra, edges with four SeBa2NdCd2 square pyramids, edges with two equivalent SeBa3Nd2 trigonal bipyramids, and a faceface with one SeBa4Cd2 octahedra. The corner-sharing octahedra tilt angles range from 22–58°.