Materials Data on K3NO4 by Materials Project
K3NO4 crystallizes in the orthorhombic Pnma 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 2.75–3.20 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.59–2.93 Å. N5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.40 Å) and two longer (1.41 Å) N–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to six K1+ and one N5+ atom. In the second O2- site, O2- is bonded in a 6-coordinate geometry to five K1+ and one N5+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to five K1+ and one N5+ atom.