DOI: 10.17188/1727929
title: Materials Data on Nb12TlTe15As by Materials Project

description: Nb12TlAsTe15 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are nine inequivalent Nb+2.67+ sites. In the first Nb+2.67+ site, Nb+2.67+ is bonded to six Te2- atoms to form a mixture of distorted corner, edge, and face-sharing NbTe6 octahedra. The corner-sharing octahedra tilt angles range from 45–58°. There are a spread of Nb–Te bond distances ranging from 2.78–2.98 Å. In the second Nb+2.67+ site, Nb+2.67+ is bonded to six Te2- atoms to form a mixture of distorted corner, edge, and face-sharing NbTe6 octahedra. The corner-sharing octahedra tilt angles range from 45–55°. There are a spread of Nb–Te bond distances ranging from 2.78–3.03 Å. In the third Nb+2.67+ site, Nb+2.67+ is bonded to six Te2- atoms to form distorted NbTe6 octahedra that share corners with eight NbTe6 octahedra, edges with four NbTe5As octahedra, and faces with two NbTe6 octahedra. The corner-sharing octahedra tilt angles range from 45–58°. There are a spread of Nb–Te bond distances ranging from 2.79–2.98 Å. In the fourth Nb+2.67+ site, Nb+2.67+ is bonded to six Te2- atoms to form distorted NbTe6 octahedra that share corners with eight NbTe6 octahedra, edges with four NbTe5As octahedra, and faces with two NbTe6 octahedra. The corner-sharing octahedra tilt angles range from 45–55°. There are a spread of Nb–Te bond distances ranging from 2.78–3.04 Å. In the fifth Nb+2.67+ site, Nb+2.67+ is bonded to six Te2- atoms to form distorted NbTe6 octahedra that share corners with eight NbTe6 octahedra, edges with four NbTe5As octahedra, and faces with two NbTe6 octahedra. The corner-sharing octahedra tilt angles range from 45–58°. There are a spread of Nb–Te bond distances ranging from 2.79–2.97 Å. In the sixth Nb+2.67+ site, Nb+2.67+ is bonded to six Te2- atoms to form distorted NbTe6 octahedra that share corners with eight NbTe6 octahedra, edges with four NbTe5As octahedra, and faces with two NbTe6 octahedra. The corner-sharing octahedra tilt angles range from 45–55°. There are a spread of Nb–Te bond distances ranging from 2.78–3.03 Å. In the seventh Nb+2.67+ site, Nb+2.67+ is bonded to one As3- and five Te2- atoms to form distorted NbTe5As octahedra that share corners with eight NbTe6 octahedra, edges with four NbTe6 octahedra, and faces with two NbTe5As octahedra. The corner-sharing octahedra tilt angles range from 43–58°. The Nb–As bond length is 2.74 Å. There are a spread of Nb–Te bond distances ranging from 2.79–2.99 Å. In the eighth Nb+2.67+ site, Nb+2.67+ is bonded to one As3- and five Te2- atoms to form distorted NbTe5As octahedra that share corners with eight NbTe6 octahedra, edges with four NbTe5As octahedra, and faces with two NbTe5As octahedra. The corner-sharing octahedra tilt angles range from 43–58°. The Nb–As bond length is 2.74 Å. There are a spread of Nb–Te bond distances ranging from 2.79–2.99 Å. In the ninth Nb+2.67+ site, Nb+2.67+ is bonded to one As3- and five Te2- atoms to form distorted NbTe5As octahedra that share corners with eight NbTe6 octahedra, edges with four NbTe5As octahedra, and faces with two NbTe5As octahedra. The corner-sharing octahedra tilt angles range from 43–58°. The Nb–As bond length is 2.74 Å. There are a spread of Nb–Te bond distances ranging from 2.79–2.98 Å. Tl1+ is bonded in a 9-coordinate geometry to nine Te2- atoms. There are a spread of Tl–Te bond distances ranging from 3.33–3.76 Å. As3- is bonded to six Nb+2.67+ atoms to form distorted AsNb6 pentagonal pyramids that share faces with two equivalent TeNb6 pentagonal pyramids. There are eleven inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 5-coordinate geometry to four Nb+2.67+ and one Tl1+ atom. In the second Te2- site, Te2- is bonded in a 4-coordinate geometry to four Nb+2.67+ atoms. In the third Te2- site, Te2- is bonded in a 5-coordinate geometry to four Nb+2.67+ and one Tl1+ atom. In the fourth Te2- site, Te2- is bonded in a 4-coordinate geometry to four Nb+2.67+ atoms. In the fifth Te2- site, Te2- is bonded in a 5-coordinate geometry to four Nb+2.67+ and one Tl1+ atom. In the sixth Te2- site, Te2- is bonded in a 4-coordinate geometry to four Nb+2.67+ atoms. In the seventh Te2- site, Te2- is bonded in a 5-coordinate geometry to four Nb+2.67+ and one Tl1+ atom. In the eighth Te2- site, Te2- is bonded in a 5-coordinate geometry to four Nb+2.67+ and one Tl1+ atom. In the ninth Te2- site, Te2- is bonded in a 5-coordinate geometry to four Nb+2.67+ and one Tl1+ atom. In the tenth Te2- site, Te2- is bonded to six Nb+2.67+ atoms to form distorted TeNb6 pentagonal pyramids that share faces with two equivalent AsNb6 pentagonal pyramids. In the eleventh Te2- site, Te2- is bonded to six Nb+2.67+ atoms to form distorted face-sharing TeNb6 pentagonal pyramids.