DOE OSTI2020
Na2Zn3(SiO4)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with four ZnO4 tetrahedra, corners with six SiO4 tetrahedra, and edges with two ZnO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.27–2.67 Å. In the second Na1+ site, Na1+ is bonded in a distorted see-saw-like geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.29–2.44 Å. In the third Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.64 Å. In the fourth Na1+ site, Na1+ is bonded to four O2- atoms to form distorted NaO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with four ZnO4 tetrahedra, and corners with four SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 89°. There are a spread of Na–O bond distances ranging from 2.20–2.42 Å. In the fifth Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share a cornercorner with one NaO4 tetrahedra, corners with three ZnO4 tetrahedra, corners with six SiO4 tetrahedra, and edges with three ZnO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.35–2.54 Å. In the sixth Na1+ site, Na1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.43 Å. There are nine inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with two ZnO4 tetrahedra, corners with four SiO4 tetrahedra, and an edgeedge with one NaO6 octahedra. The corner-sharing octahedral tilt angles are 78°. There are a spread of Zn–O bond distances ranging from 1.95–2.03 Å. In the second Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with two equivalent NaO4 tetrahedra, corners with two ZnO4 tetrahedra, and corners with four SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 86°. There are a spread of Zn–O bond distances ranging from 1.98–2.03 Å. In the third Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with four ZnO4 tetrahedra, corners with four SiO4 tetrahedra, and an edgeedge with one NaO6 octahedra. The corner-sharing octahedral tilt angles are 84°. There are a spread of Zn–O bond distances ranging from 1.96–2.06 Å. In the fourth Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with two ZnO4 tetrahedra, corners with four SiO4 tetrahedra, and an edgeedge with one NaO6 octahedra. The corner-sharing octahedral tilt angles are 79°. There are a spread of Zn–O bond distances ranging from 1.94–2.06 Å. In the fifth Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with four ZnO4 tetrahedra and corners with four SiO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.96–2.02 Å. In the sixth Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO4 tetrahedra, a cornercorner with one ZnO4 tetrahedra, and corners with four SiO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.95–2.02 Å. In the seventh Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with two ZnO4 tetrahedra, corners with four SiO4 tetrahedra, and an edgeedge with one NaO6 octahedra. The corner-sharing octahedral tilt angles are 78°. There are a spread of Zn–O bond distances ranging from 1.95–2.08 Å. In the eighth Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with four ZnO4 tetrahedra, and corners with four SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 83°. There are a spread of Zn–O bond distances ranging from 1.97–2.01 Å. In the ninth Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one NaO6 octahedra, a cornercorner with one NaO4 tetrahedra, corners with three ZnO4 tetrahedra, corners with four SiO4 tetrahedra, and an edgeedge with one NaO6 octahedra. The corner-sharing octahedral tilt angles are 79°. There are a spread of Zn–O bond distances ranging from 1.98–2.02 Å. There are six inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO6 octahedra and corners with six ZnO4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. There are a spread of Si–O bond distances ranging from 1.64–1.67 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent NaO6 octahedra, corners with two equivalent NaO4 tetrahedra, and corners with six ZnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 57–62°. There are a spread of Si–O bond distances ranging from 1.63–1.68 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four NaO6 octahedra and corners with six ZnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 47–65°. There are a spread of Si–O bond distances ranging from 1.63–1.68 Å. In the fourth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO6 octahedra, a cornercorner with one NaO4 tetrahedra, and corners with seven ZnO4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. There are a spread of Si–O bond distances ranging from 1.62–1.68 Å. In the fifth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent NaO6 octahedra, a cornercorner with one NaO4 tetrahedra, and corners with five ZnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 56–65°. There are a spread of Si–O bond distances ranging from 1.64–1.68 Å. In the sixth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two NaO6 octahedra and corners with six ZnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–55°. There are a spread of Si–O bond distances ranging from 1.64–1.67 Å. There are twenty-four inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two Zn2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a trigonal planar geometry to two Zn2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two Zn2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Zn2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a trigonal planar geometry to two Zn2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the eighth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Na1+, one Zn2+, and one Si4+ atom. In the ninth O2- site, O2- is bonded in a trigonal planar geometry to two Zn2+ and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Zn2+, and one Si4+ atom. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the twelfth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the thirteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Na1+, one Zn2+, and one Si4+ atom. In the fourteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Zn2+ and one Si4+ atom. In the fifteenth O2- site, O2- is bonded in a distorted tetrahedral geometry to one Na1+, two Zn2+, and one Si4+ atom. In the sixteenth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the seventeenth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the eighteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Zn2+, and one Si4+ atom. In the nineteenth O2- site, O2- is bonded in a 3-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the twentieth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Na1+, one Zn2+, and one Si4+ atom. In the twenty-first O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Zn2+, and one Si4+ atom. In the twenty-second O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Zn2+, and one Si4+ atom. In the twenty-third O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom. In the twenty-fourth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Zn2+, and one Si4+ atom.