Materials Data on K2PHO4 by Materials Project
K2HPO4 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are six inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to one H1+ and seven O2- atoms. The K–H bond length is 2.84 Å. There are a spread of K–O bond distances ranging from 2.84–3.11 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to one H1+ and eight O2- atoms. The K–H bond length is 2.76 Å. There are a spread of K–O bond distances ranging from 2.84–3.37 Å. In the third K1+ site, K1+ is bonded in a 7-coordinate geometry to one H1+ and six O2- atoms. The K–H bond length is 2.76 Å. There are a spread of K–O bond distances ranging from 2.68–3.00 Å. In the fourth K1+ site, K1+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of K–O bond distances ranging from 2.66–2.80 Å. In the fifth K1+ site, K1+ is bonded in a 8-coordinate geometry to one H1+ and seven O2- atoms. The K–H bond length is 2.78 Å. There are a spread of K–O bond distances ranging from 2.74–3.10 Å. In the sixth K1+ site, K1+ is bonded in a 7-coordinate geometry to one H1+ and six O2- atoms. The K–H bond length is 2.85 Å. There are a spread of K–O bond distances ranging from 2.63–2.78 Å. There are three inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.53–1.64 Å. In the second P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.53–1.64 Å. In the third P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.53–1.64 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a 1-coordinate geometry to two K1+ and two O2- atoms. There is one shorter (1.02 Å) and one longer (1.61 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a distorted linear geometry to two K1+ and two O2- atoms. There is one shorter (1.04 Å) and one longer (1.55 Å) H–O bond length. In the third H1+ site, H1+ is bonded in a 2-coordinate geometry to one K1+ and two O2- atoms. There is one shorter (1.01 Å) and one longer (1.62 Å) H–O bond length. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+, one P5+, and one H1+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four K1+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to five K1+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to five K1+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two K1+, one P5+, and one H1+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to four K1+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one P5+, and one H1+ atom. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to two K1+, one P5+, and one H1+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one P5+, and one H1+ atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to five K1+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to three K1+, one P5+, and one H1+ atom. In the twelfth O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one P5+ atom.