Materials Data on K2Se3 by Materials Project
K2Se3 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 8-coordinate geometry to eight Se atoms. There are a spread of K–Se bond distances ranging from 3.31–3.66 Å. In the second K site, K is bonded in a 7-coordinate geometry to seven Se atoms. There are a spread of K–Se bond distances ranging from 3.38–3.51 Å. There are two inequivalent Se sites. In the first Se site, Se is bonded in a 5-coordinate geometry to three K and two equivalent Se atoms. Both Se–Se bond lengths are 2.43 Å. In the second Se site, Se is bonded to six K and one Se atom to form a mixture of distorted corner, edge, and face-sharing SeK6Se pentagonal bipyramids.