Materials Data on KP(HO2)2 by Materials Project

Abstract

KH2PO4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to two equivalent H1+ and six O2- atoms. There are one shorter (2.84 Å) and one longer (2.86 Å) K–H bond lengths. There are a spread of K–O bond distances ranging from 2.71–2.91 Å. P5+ is bonded to four O2- atoms to form corner-sharing PO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.49–1.63 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to two equivalent K1+ and one O2- atom. The H–O bond length is 0.99 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 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 P5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent K1+ and one P5+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent P5+ atoms. In the fourth O2- site, O2- is bonded in a water-like geometry to two equivalent K1+ and two H1+ atoms.