Materials Data on K2TeO5 by Materials Project
K2TeO5 crystallizes in the orthorhombic Immm space group. The structure is two-dimensional and consists of two K2TeO5 sheets oriented in the (0, 0, 1) direction. there are three inequivalent K sites. In the first K site, K is bonded in a 6-coordinate geometry to four equivalent O atoms. All K–O bond lengths are 2.78 Å. In the second K site, K is bonded in a 4-coordinate geometry to four equivalent O atoms. All K–O bond lengths are 2.74 Å. In the third K site, K is bonded in a distorted T-shaped geometry to three O atoms. There are two shorter (2.57 Å) and one longer (2.60 Å) K–O bond lengths. Te is bonded to six O atoms to form edge-sharing TeO6 octahedra. There are a spread of Te–O bond distances ranging from 1.90–2.04 Å. There are five inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Te atom. In the second O site, O is bonded in a 1-coordinate geometry to three K and one Te atom. In the third O site, O is bonded in a water-like geometry to two equivalent Te atoms. In the fourth O site, O is bonded in a water-like geometry to two equivalent Te atoms. In the fifth O site, O is bonded in a bent 150 degrees geometry to one K and one Te atom.