Materials Data on K2BAs2HO8 by Materials Project
K2BAs2HO8 crystallizes in the tetragonal P4_1 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.74–3.45 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.71–3.36 Å. B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with four AsO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.48–1.50 Å. There are two inequivalent As5+ sites. In the first As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with two equivalent BO4 tetrahedra. There are a spread of As–O bond distances ranging from 1.67–1.75 Å. In the second As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with two equivalent BO4 tetrahedra. There are a spread of As–O bond distances ranging from 1.68–1.77 Å. H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.09 Å) and one longer (1.39 Å) H–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three K1+ and one As5+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three K1+ and one As5+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+, one B3+, and one As5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+, one B3+, and one As5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one As5+, and one H1+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one As5+, and one H1+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+, one B3+, and one As5+ atom. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one B3+, and one As5+ atom.