DOE OSTI2020
Cu3TlTe2 crystallizes in the monoclinic Pc space group. The structure is three-dimensional. there are twelve inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded in a 4-coordinate geometry to four Te2- atoms. There are a spread of Cu–Te bond distances ranging from 2.70–2.85 Å. In the second Cu1+ site, Cu1+ is bonded in a 4-coordinate geometry to four Te2- atoms. There are a spread of Cu–Te bond distances ranging from 2.70–2.85 Å. In the third Cu1+ site, Cu1+ is bonded in a 4-coordinate geometry to four Te2- atoms. There are a spread of Cu–Te bond distances ranging from 2.70–2.81 Å. In the fourth Cu1+ site, Cu1+ is bonded in a 4-coordinate geometry to four Te2- atoms. There are a spread of Cu–Te bond distances ranging from 2.69–2.88 Å. In the fifth Cu1+ site, Cu1+ is bonded in a 4-coordinate geometry to four Te2- atoms. There are a spread of Cu–Te bond distances ranging from 2.57–2.89 Å. In the sixth Cu1+ site, Cu1+ is bonded in a 4-coordinate geometry to four Te2- atoms. There are a spread of Cu–Te bond distances ranging from 2.60–2.89 Å. In the seventh Cu1+ site, Cu1+ is bonded in a 1-coordinate geometry to one Cu1+ and four Te2- atoms. The Cu–Cu bond length is 2.50 Å. There are a spread of Cu–Te bond distances ranging from 2.58–2.92 Å. In the eighth Cu1+ site, Cu1+ is bonded to four Te2- atoms to form corner-sharing CuTe4 tetrahedra. There are a spread of Cu–Te bond distances ranging from 2.65–2.77 Å. In the ninth Cu1+ site, Cu1+ is bonded to four Te2- atoms to form corner-sharing CuTe4 tetrahedra. There are a spread of Cu–Te bond distances ranging from 2.63–2.68 Å. In the tenth Cu1+ site, Cu1+ is bonded in a 2-coordinate geometry to three Cu1+ and four Te2- atoms. There are one shorter (2.52 Å) and one longer (2.53 Å) Cu–Cu bond lengths. There are a spread of Cu–Te bond distances ranging from 2.61–2.85 Å. In the eleventh Cu1+ site, Cu1+ is bonded in a 3-coordinate geometry to one Cu1+, one Tl1+, and four Te2- atoms. The Cu–Tl bond length is 3.35 Å. There are a spread of Cu–Te bond distances ranging from 2.59–2.89 Å. In the twelfth Cu1+ site, Cu1+ is bonded in a 3-coordinate geometry to one Cu1+, one Tl1+, and four Te2- atoms. The Cu–Tl bond length is 3.35 Å. There are a spread of Cu–Te bond distances ranging from 2.60–2.89 Å. There are four inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded in a 10-coordinate geometry to two Tl1+ and eight Te2- atoms. There are one shorter (3.58 Å) and one longer (3.65 Å) Tl–Tl bond lengths. There are a spread of Tl–Te bond distances ranging from 3.58–3.80 Å. In the second Tl1+ site, Tl1+ is bonded in a 10-coordinate geometry to two Tl1+ and eight Te2- atoms. There are one shorter (3.57 Å) and one longer (3.65 Å) Tl–Tl bond lengths. There are a spread of Tl–Te bond distances ranging from 3.59–3.77 Å. In the third Tl1+ site, Tl1+ is bonded in a 11-coordinate geometry to one Cu1+, two Tl1+, and eight Te2- atoms. There are a spread of Tl–Te bond distances ranging from 3.47–3.77 Å. In the fourth Tl1+ site, Tl1+ is bonded in a 11-coordinate geometry to one Cu1+, two Tl1+, and eight Te2- atoms. There are a spread of Tl–Te bond distances ranging from 3.47–3.78 Å. There are eight inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 2-coordinate geometry to seven Cu1+ and four Tl1+ atoms. In the second Te2- site, Te2- is bonded in a 6-coordinate geometry to six Cu1+ and four Tl1+ atoms. In the third Te2- site, Te2- is bonded in a 10-coordinate geometry to six Cu1+ and four Tl1+ atoms. In the fourth Te2- site, Te2- is bonded in a 10-coordinate geometry to six Cu1+ and four Tl1+ atoms. In the fifth Te2- site, Te2- is bonded in a 3-coordinate geometry to six Cu1+ and four Tl1+ atoms. In the sixth Te2- site, Te2- is bonded in a 7-coordinate geometry to five Cu1+ and four Tl1+ atoms. In the seventh Te2- site, Te2- is bonded in a 8-coordinate geometry to six Cu1+ and four Tl1+ atoms. In the eighth Te2- site, Te2- is bonded in a 8-coordinate geometry to six Cu1+ and four Tl1+ atoms.