Materials Data on NaCaPO4 by Materials Project
NaCaPO4 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 5-coordinate geometry to nine O2- atoms. There are a spread of Na–O bond distances ranging from 2.33–3.08 Å. In the second Na1+ site, Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–2.82 Å. In the third Na1+ site, Na1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–3.01 Å. There are three inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.37–2.72 Å. In the second Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.83 Å. In the third Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.39–2.60 Å. There are three inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.55 Å) and three longer (1.56 Å) P–O bond length. In the second P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.54 Å) and three longer (1.56 Å) P–O bond length. In the third P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.55 Å) and three longer (1.56 Å) P–O bond length. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, two Ca2+, and one P5+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, two Ca2+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to three Na1+, two Ca2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two equivalent Ca2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, two Ca2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, two Ca2+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+, two Ca2+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, two Ca2+, and one P5+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, two Ca2+, and one P5+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, two Ca2+, and one P5+ atom. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, two Ca2+, and one P5+ atom. In the twelfth O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Na1+, two Ca2+, and one P5+ atom.