DOE OSTI2020
NaMgP(CO3)2 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. Na1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.37–2.51 Å. Mg2+ is bonded in a distorted octahedral geometry to six O2- atoms. There are a spread of Mg–O bond distances ranging from 2.03–2.40 Å. There are two inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.27 Å) C–O bond length. In the second C2+ site, C2+ is bonded in a single-bond geometry to one O2- atom. The C–O bond length is 1.24 Å. P5+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. All P–O bond lengths are 1.53 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Mg2+ and one C2+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Mg2+, and one P5+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Mg2+, and one C2+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+, one Mg2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Mg2+ and one C2+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Mg2+, and one P5+ atom.