Materials Data on Al2Te5 by Materials Project
Al2Te5 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of one Al2Te5 sheet oriented in the (2, 0, -1) direction. Al3+ is bonded to four Te+1.20- atoms to form a mixture of corner and edge-sharing AlTe4 tetrahedra. There are a spread of Al–Te bond distances ranging from 2.59–2.71 Å. There are three inequivalent Te+1.20- sites. In the first Te+1.20- site, Te+1.20- is bonded in a distorted single-bond geometry to one Al3+ and two equivalent Te+1.20- atoms. Both Te–Te bond lengths are 3.04 Å. In the second Te+1.20- site, Te+1.20- is bonded in a square co-planar geometry to four equivalent Te+1.20- atoms. In the third Te+1.20- site, Te+1.20- is bonded in a 3-coordinate geometry to three equivalent Al3+ atoms.