Materials Data on MgAl2SiO7 by Materials Project

Dataset · Wed Apr 29 04:00:00 EDT 2020

DOI:https://doi.org/10.17188/1748284· OSTI ID:1748284

MgAl2SiO7 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Mg is bonded to six O atoms to form distorted MgO6 octahedra that share corners with two equivalent SiO4 tetrahedra, edges with three equivalent MgO6 octahedra, and edges with three equivalent AlO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.07–2.17 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four equivalent SiO4 tetrahedra and edges with four AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.82–1.98 Å. In the second Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with two equivalent SiO4 tetrahedra and edges with six equivalent MgO6 octahedra. There are a spread of Al–O bond distances ranging from 1.86–2.07 Å. In the third Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four equivalent SiO4 tetrahedra and edges with four equivalent AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.82–1.98 Å. Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent MgO6 octahedra and corners with seven AlO6 octahedra. The corner-sharing octahedra tilt angles range from 53–60°. There is three shorter (1.65 Å) and one longer (1.66 Å) Si–O bond length. There are seven inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to two Al and one Si atom. In the second O site, O is bonded in a distorted trigonal planar geometry to two equivalent Al and one Si atom. In the third O site, O is bonded in a distorted trigonal non-coplanar geometry to three Al atoms. In the fourth O site, O is bonded to two equivalent Mg, one Al, and one Si atom to form a mixture of distorted corner and edge-sharing OMg2AlSi trigonal pyramids. In the fifth O site, O is bonded in a trigonal non-coplanar geometry to two equivalent Mg and one Al atom. In the sixth O site, O is bonded in a trigonal non-coplanar geometry to two equivalent Mg and one Al atom. In the seventh O site, O is bonded in a distorted trigonal planar geometry to two Al and one Si atom.

• 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: 1748284
• Report Number(s): mp-1210718
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Al-Mg-O-Si
MgAl2SiO7
crystal structure