Materials Data on Tl2Bi2Te3Se by Materials Project

Abstract

Tl2Bi2Te3Se crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded to four Te2- and two equivalent Se2- atoms to form TlTe4Se2 octahedra that share corners with two equivalent BiTe4Se2 octahedra, corners with four equivalent TlTe4Se2 octahedra, edges with four equivalent TlTe5Se octahedra, and edges with eight BiTe4Se2 octahedra. The corner-sharing octahedra tilt angles range from 6–10°. There are a spread of Tl–Te bond distances ranging from 3.02–3.39 Å. There are one shorter (3.04 Å) and one longer (3.43 Å) Tl–Se bond lengths. In the second Tl1+ site, Tl1+ is bonded to five Te2- and one Se2- atom to form TlTe5Se octahedra that share corners with two equivalent BiTe5Se octahedra, corners with four equivalent TlTe5Se octahedra, edges with four equivalent TlTe4Se2 octahedra, and edges with eight BiTe4Se2 octahedra. The corner-sharing octahedra tilt angles range from 1–13°. There are a spread of Tl–Te bond distances ranging from 2.99–3.50 Å. The Tl–Se bond length is 3.23 Å. There are two inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded to four Te2- and two equivalent Se2- atoms to form distorted BiTe4Se2 octahedra that share corners with two equivalent TlTe4Se2 octahedra, corners with four equivalent BiTe4Se2 octahedra, edges with four equivalent BiTe5Se octahedra, and edges with eight TlTe4Se2 octahedra. The corner-sharing octahedra tilt angles range from 6–12°. There are a spread of Bi–Te bond distances ranging from 3.01–3.47 Å. There are one shorter (3.05 Å) and one longer (3.34 Å) Bi–Se bond lengths. In the second Bi3+ site, Bi3+ is bonded to five Te2- and one Se2- atom to form BiTe5Se octahedra that share corners with two equivalent TlTe5Se octahedra, corners with four equivalent BiTe5Se octahedra, edges with four equivalent BiTe4Se2 octahedra, and edges with eight TlTe4Se2 octahedra. The corner-sharing octahedra tilt angles range from 1–15°. There are a spread of Bi–Te bond distances ranging from 2.96–3.53 Å. The Bi–Se bond length is 3.67 Å. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to three Tl1+ and three Bi3+ atoms to form a mixture of distorted corner and edge-sharing TeTl3Bi3 octahedra. The corner-sharing octahedra tilt angles range from 0–13°. In the second Te2- site, Te2- is bonded in a 6-coordinate geometry to three Tl1+ and three Bi3+ atoms. In the third Te2- site, Te2- is bonded to three Tl1+ and three Bi3+ atoms to form a mixture of distorted corner and edge-sharing TeTl3Bi3 octahedra. The corner-sharing octahedra tilt angles range from 0–15°. Se2- is bonded in a 6-coordinate geometry to three Tl1+ and three Bi3+ atoms.