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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on K2Cu2Te5 by Materials Project

K2Cu2Te5 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. K1+ is bonded in a 10-coordinate geometry to ten Te+0.80- atoms. There are a spread of K–Te bond distances ranging from 3.64–3.86 Å. Cu1+ is bonded to four Te+0.80- atoms to form a mixture of distorted edge and corner-sharing CuTe4 tetrahedra. There are a spread of Cu–Te bond distances ranging from 2.63–2.67 Å. There are three inequivalent Te+0.80- sites. In the first Te+0.80- site, Te+0.80- is bonded in a 7-coordinate geometry to four equivalent K1+, two equivalent Cu1+, and one Te+0.80- atom. The Te–Te bond length is 2.88 Å. In the second Te+0.80- site, Te+0.80- is bonded in a 2-coordinate geometry to four equivalent K1+, two equivalent Cu1+, and one Te+0.80- atom. The Te–Te bond length is 2.86 Å. In the third Te+0.80- site, Te+0.80- is bonded in a 6-coordinate geometry to four equivalent K1+ and two equivalent Te+0.80- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KCu3Te2 by Materials Project

KCu3Te2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. K1+ is bonded to seven Te2- atoms to form a mixture of distorted edge and face-sharing KTe7 pentagonal bipyramids. There are a spread of K–Te bond distances ranging from 3.52–3.62 Å. There are three inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded in a 3-coordinate geometry to one Cu1+ and four Te2- atoms. The Cu–Cu bond length is 2.49 Å. There are a spread of Cu–Te bond distances ranging from 2.57–2.92 Å. In the second Cu1+ site, Cu1+ is bonded in a 1-coordinate geometry to one Cu1+ and four Te2- atoms. There are a spread of Cu–Te bond distances ranging from 2.58–2.86 Å. In the third Cu1+ site, Cu1+ is bonded in a trigonal planar geometry to three Te2- atoms. All Cu–Te bond lengths are 2.58 Å. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 9-coordinate geometry to three equivalent K1+ and six Cu1+ atoms. In the second Te2- site, Te2- is bonded in a 9-coordinate geometry to four equivalent K1+ and five Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KCuTe by Materials Project

KCuTe crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. K1+ is bonded to six equivalent Te2- atoms to form a mixture of distorted edge, corner, and face-sharing KTe6 octahedra. The corner-sharing octahedral tilt angles are 42°. All K–Te bond lengths are 3.62 Å. Cu1+ is bonded in a trigonal planar geometry to three equivalent Te2- atoms. All Cu–Te bond lengths are 2.58 Å. Te2- is bonded in a 3-coordinate geometry to six equivalent K1+ and three equivalent Cu1+ atoms.

36 MATERIALS SCIENCE↗