Materials Data on Na3Mg2(WO4)3 by Materials Project

Dataset · Fri May 01 04:00:00 EDT 2020

DOI:https://doi.org/10.17188/1654903· OSTI ID:1654903

Na3Mg2(WO4)3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first 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 2.34–2.45 Å. In the second Na1+ site, Na1+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.42–2.69 Å. In the third Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 pentagonal pyramids that share corners with two equivalent MgO6 octahedra, corners with four equivalent WO4 tetrahedra, edges with two equivalent MgO6 octahedra, edges with two equivalent NaO6 pentagonal pyramids, and an edgeedge with one WO4 tetrahedra. The corner-sharing octahedral tilt angles are 67°. There are a spread of Na–O bond distances ranging from 2.50–2.64 Å. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share a cornercorner with one NaO6 pentagonal pyramid, corners with six WO4 tetrahedra, an edgeedge with one MgO6 octahedra, and an edgeedge with one NaO6 pentagonal pyramid. There are a spread of Mg–O bond distances ranging from 2.06–2.32 Å. There are two inequivalent W+5.67+ sites. In the first W+5.67+ site, W+5.67+ is bonded to four O2- atoms to form distorted WO4 tetrahedra that share corners with four equivalent MgO6 octahedra and an edgeedge with one NaO6 pentagonal pyramid. The corner-sharing octahedra tilt angles range from 60–65°. There is two shorter (1.88 Å) and two longer (1.91 Å) W–O bond length. In the second W+5.67+ site, W+5.67+ is bonded to four O2- atoms to form WO4 tetrahedra that share corners with four equivalent MgO6 octahedra and corners with two equivalent NaO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 39–64°. There are a spread of W–O bond distances ranging from 1.78–1.85 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Mg2+ and one W+5.67+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+, one Mg2+, and one W+5.67+ atom. In the third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Na1+ and one W+5.67+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+, one Mg2+, and one W+5.67+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Mg2+, and one W+5.67+ atom. In the sixth O2- site, O2- is bonded to two equivalent Na1+, one Mg2+, and one W+5.67+ atom to form a mixture of distorted edge and corner-sharing ONa2MgW trigonal pyramids.

• Research Organization: LBNL Materials Project; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Contributing Organization: The Materials Project; MIT; UC Berkeley; Duke; U Louvain
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1654903
• Report Number(s): mp-1210564
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Mg-Na-O-W
Na3Mg2(WO4)3
crystal structure