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.