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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Bi2Te2Se by Materials Project

Bi2Te2Se is MAX Phase-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Bi2Te2Se sheets oriented in the (0, 0, 1) direction. Bi3+ is bonded to three equivalent Te2- and three equivalent Se2- atoms to form a mixture of corner and edge-sharing BiTe3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. All Bi–Te bond lengths are 3.07 Å. All Bi–Se bond lengths are 3.12 Å. Te2- is bonded in a 3-coordinate geometry to three equivalent Bi3+ atoms. Se2- is bonded to six equivalent Bi3+ atoms to form edge-sharing SeBi6 octahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Bi2TeSe2 by Materials Project

Bi2Se2Te is Calaverite-derived structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Bi2Se2Te sheets oriented in the (0, 0, 1) direction. Bi3+ is bonded to three equivalent Te2- and three equivalent Se2- atoms to form a mixture of distorted edge and corner-sharing BiTe3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. All Bi–Te bond lengths are 3.26 Å. All Bi–Se bond lengths are 2.90 Å. Te2- is bonded to six equivalent Bi3+ atoms to form edge-sharing TeBi6 octahedra. Se2- is bonded in a 3-coordinate geometry to three equivalent Bi3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Bi4(TeSe)3 by Materials Project

Bi4(TeSe)3 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are four inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded to one Te2- and five Se2- atoms to form BiTeSe5 octahedra that share corners with three equivalent BiTe3Se3 octahedra and edges with nine BiTeSe5 octahedra. The corner-sharing octahedral tilt angles are 1°. The Bi–Te bond length is 3.10 Å. There are a spread of Bi–Se bond distances ranging from 2.91–3.12 Å. In the second Bi3+ site, Bi3+ is bonded to two equivalent Te2- and four Se2- atoms to form BiTe2Se4 octahedra that share corners with three equivalent BiTe3Se3 octahedra and edges with nine BiTeSe5 octahedra. The corner-sharing octahedral tilt angles are 1°. Both Bi–Te bond lengths are 3.07 Å. There are a spread of Bi–Se bond distances ranging from 2.88–3.14 Å. In the third Bi3+ site, Bi3+ is bonded to three Te2- and three Se2- atoms to form BiTe3Se3 octahedra that share corners with three equivalent BiTe2Se4 octahedra and edges with nine BiTeSe5 octahedra. The corner-sharing octahedral tilt angles are 1°. All Bi–Te bond lengths are 3.07 Å. There are two shorter (3.11 Å) and one longer (3.12 Å) Bi–Se bond lengths. In the fourth Bi3+ site, Bi3+ is bonded to three Te2- and three Se2- atoms to form a mixture of edge and corner-sharing BiTe3Se3 octahedra. The corner-sharing octahedral tilt angles are 1°. There are two shorter (3.06 Å) and one longer (3.07 Å) Bi–Te bond lengths. There are one shorter (3.13 Å) and two longer (3.15 Å) Bi–Se bond lengths. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 3-coordinate geometry to three Bi3+ atoms. In the second Te2- site, Te2- is bonded in a 4-coordinate geometry to three Bi3+ and one Se2- atom. The Te–Se bond length is 4.08 Å. In the third Te2- site, Te2- is bonded in a 5-coordinate geometry to three Bi3+ atoms. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to six Bi3+ atoms to form edge-sharing SeBi6 octahedra. In the second Se2- site, Se2- is bonded to six Bi3+ atoms to form edge-sharing SeBi6 octahedra. In the third Se2- site, Se2- is bonded in a 3-coordinate geometry to three Bi3+ and one Te2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Bi4(TeSe)3 by Materials Project

Bi4(TeSe)3 is MAX Phase-like structured and crystallizes in the trigonal R3m space group. The structure is two-dimensional and consists of three Bi4(TeSe)3 sheets oriented in the (0, 0, 1) direction. there are four inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded to six Se2- atoms to form BiSe6 octahedra that share corners with three equivalent BiTe3Se3 octahedra, corners with three equivalent TeBi3Se3 octahedra, edges with three equivalent TeBi3Se3 octahedra, and edges with nine BiSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–20°. There are three shorter (2.91 Å) and three longer (3.11 Å) Bi–Se bond lengths. In the second Bi3+ site, Bi3+ is bonded to three equivalent Te2- and three equivalent Se2- atoms to form a mixture of edge and corner-sharing BiTe3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. All Bi–Te bond lengths are 3.07 Å. All Bi–Se bond lengths are 3.11 Å. In the third Bi3+ site, Bi3+ is bonded to three equivalent Te2- and three equivalent Se2- atoms to form a mixture of edge and corner-sharing BiTe3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. All Bi–Te bond lengths are 3.07 Å. All Bi–Se bond lengths are 3.13 Å. In the fourth Bi3+ site, Bi3+ is bonded to three equivalent Te2- and three equivalent Se2- atoms to form a mixture of edge and corner-sharing BiTe3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. All Bi–Te bond lengths are 3.07 Å. All Bi–Se bond lengths are 3.12 Å. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 3-coordinate geometry to three equivalent Bi3+ atoms. In the second Te2- site, Te2- is bonded to three equivalent Bi3+ and three equivalent Se2- atoms to form distorted TeBi3Se3 octahedra that share corners with three equivalent BiSe6 octahedra, corners with three equivalent SeBi6 octahedra, edges with three equivalent BiSe6 octahedra, edges with three equivalent SeBi6 octahedra, and edges with six equivalent TeBi3Se3 octahedra. The corner-sharing octahedra tilt angles range from 2–20°. All Te–Se bond lengths are 3.99 Å. In the third Te2- site, Te2- is bonded in a 3-coordinate geometry to three equivalent Bi3+ atoms. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to six Bi3+ atoms to form SeBi6 octahedra that share corners with three equivalent TeBi3Se3 octahedra, edges with three equivalent TeBi3Se3 octahedra, and edges with six equivalent SeBi6 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second Se2- site, Se2- is bonded to six Bi3+ atoms to form edge-sharing SeBi6 octahedra. In the third Se2- site, Se2- is bonded in a 6-coordinate geometry to three equivalent Bi3+ and three equivalent Te2- atoms.

36 MATERIALS SCIENCE↗