Materials Data on K2B2(SO4)3 by Materials Project
K2B2(SO4)3 crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 12-coordinate geometry to six O2- atoms. There are three shorter (3.02 Å) and three longer (3.29 Å) K–O bond lengths. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.96 Å) and three longer (3.01 Å) K–O bond lengths. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All B–O bond lengths are 1.38 Å. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All B–O bond lengths are 1.39 Å. S+5.33+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of S–O bond distances ranging from 1.46–1.79 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one K1+ and one S+5.33+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one S+5.33+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+, one B3+, and one S+5.33+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+ and one S+5.33+ atom.