Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Na2Be(SiO3)2”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

2 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na2Be(SiO3)2 by Materials Project

Na2BeSi2O6 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 2-coordinate geometry to four O2- atoms. There are two shorter (2.30 Å) and two longer (2.56 Å) Na–O bond lengths. In the second Na1+ site, Na1+ is bonded in a 2-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.39–3.05 Å. There are two inequivalent Be2+ sites. In the first Be2+ site, Be2+ is bonded to four O2- atoms to form BeO4 tetrahedra that share corners with four SiO4 tetrahedra. There is two shorter (1.62 Å) and two longer (1.66 Å) Be–O bond length. In the second Be2+ site, Be2+ is bonded to four equivalent O2- atoms to form BeO4 tetrahedra that share corners with four equivalent SiO4 tetrahedra. All Be–O bond lengths are 1.60 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent BeO4 tetrahedra and corners with two equivalent SiO4 tetrahedra. There is two shorter (1.60 Å) and two longer (1.70 Å) Si–O bond length. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two BeO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.59–1.68 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent Na1+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Be2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+, one Be2+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Na1+ and two Si4+ atoms. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to three equivalent Na1+, one Be2+, and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Be(SiO3)2 by Materials Project

Na2BeSi2O6 crystallizes in the orthorhombic Fdd2 space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 5-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–2.93 Å. In the second Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent BeO4 tetrahedra, corners with six SiO4 tetrahedra, and an edgeedge with one BeO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.30–2.50 Å. In the third 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 2.29–2.70 Å. In the fourth Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.49–2.89 Å. There are two inequivalent Be2+ sites. In the first Be2+ site, Be2+ is bonded to four O2- atoms to form BeO4 tetrahedra that share corners with four SiO4 tetrahedra and corners with two equivalent NaO5 trigonal bipyramids. There are a spread of Be–O bond distances ranging from 1.64–1.67 Å. In the second Be2+ site, Be2+ is bonded to four O2- atoms to form BeO4 tetrahedra that share corners with four SiO4 tetrahedra and edges with two equivalent NaO5 trigonal bipyramids. There is two shorter (1.64 Å) and two longer (1.65 Å) Be–O bond length. There are four inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two BeO4 tetrahedra, corners with two SiO4 tetrahedra, and corners with two equivalent NaO5 trigonal bipyramids. There are a spread of Si–O bond distances ranging from 1.61–1.69 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two BeO4 tetrahedra, corners with two SiO4 tetrahedra, and corners with two equivalent NaO5 trigonal bipyramids. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent BeO4 tetrahedra, corners with two equivalent SiO4 tetrahedra, and corners with two equivalent NaO5 trigonal bipyramids. There is two shorter (1.62 Å) and two longer (1.68 Å) Si–O bond length. In the fourth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent BeO4 tetrahedra, corners with two equivalent SiO4 tetrahedra, and corners with two equivalent NaO5 trigonal bipyramids. There is two shorter (1.61 Å) and two longer (1.67 Å) Si–O bond length. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Na1+, one Be2+, and one Si4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+, one Be2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+, one Be2+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Na1+, one Be2+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two Na1+ and two Si4+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Be2+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+ and two Si4+ atoms. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Be2+, and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+ and two Si4+ atoms.

36 MATERIALS SCIENCE↗