Materials Data on BaAsHO4 by Materials Project
Ba(AsO3OH) crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.76–3.04 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.69–3.13 Å. There are two inequivalent As5+ sites. In the first As5+ site, As5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of As–O bond distances ranging from 1.70–1.80 Å. In the second As5+ site, As5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of As–O bond distances ranging from 1.71–1.79 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.04 Å) and one longer (1.50 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.04 Å) and one longer (1.52 Å) H–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, one As5+, and one H1+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+ and one As5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ba2+ and one As5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Ba2+, one As5+, and one H1+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two Ba2+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, one As5+, and one H1+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, one As5+, and one H1+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+ and one As5+ atom.