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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na3MgPCO7 by Materials Project

Na3MgCPO7 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first 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 2.31–2.86 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.76 Å. Mg2+ is bonded to six O2- atoms to form distorted MgO6 octahedra that share corners with four equivalent PO4 tetrahedra. There are a spread of Mg–O bond distances ranging from 2.04–2.25 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent MgO6 octahedra. The corner-sharing octahedra tilt angles range from 43–50°. There is one shorter (1.55 Å) and three longer (1.56 Å) P–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Mg2+, and one C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Mg2+, and one C4+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Mg2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na1+, one Mg2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Na1+, one Mg2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3MgPCO7 by Materials Project

Na3MgCPO7 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with two equivalent PO4 tetrahedra, edges with two equivalent NaO6 octahedra, and edges with two equivalent MgO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.30–2.46 Å. In the second Na1+ site, Na1+ is bonded in a 3-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.23–2.83 Å. In the third Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with four equivalent PO4 tetrahedra, corners with four equivalent MgO5 trigonal bipyramids, and faces with two equivalent NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.26–2.65 Å. Mg2+ is bonded to five O2- atoms to form distorted MgO5 trigonal bipyramids that share corners with four equivalent NaO6 octahedra, corners with three equivalent PO4 tetrahedra, and edges with two equivalent NaO6 octahedra. The corner-sharing octahedra tilt angles range from 71–83°. There are a spread of Mg–O bond distances ranging from 2.01–2.19 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.29–1.32 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with six NaO6 octahedra and corners with three equivalent MgO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 52–69°. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+ and one C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Mg2+, and one C4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Mg2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Na1+, one Mg2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+, one Mg2+, and one C4+ atom. In the sixth O2- site, O2- is bonded to three Na1+ and one P5+ atom to form distorted corner-sharing ONa3P tetrahedra. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Na1+, one Mg2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaMgP(CO3)2 by Materials Project

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.

36 MATERIALS SCIENCE↗