Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “LaSe2”

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.

3 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on LaSe2 by Materials Project

LaSe2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. La3+ is bonded in a 7-coordinate geometry to seven Se+1.50- atoms. There are a spread of La–Se bond distances ranging from 2.94–3.27 Å. There are two inequivalent Se+1.50- sites. In the first Se+1.50- site, Se+1.50- is bonded in a 4-coordinate geometry to four equivalent La3+ atoms. In the second Se+1.50- site, Se+1.50- is bonded in a 4-coordinate geometry to three equivalent La3+ and one Se+1.50- atom. The Se–Se bond length is 2.50 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(LaSe2)2 by Materials Project

Sr(LaSe2)2 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Sr2+ is bonded to eight equivalent Se2- atoms to form distorted SrSe8 hexagonal bipyramids that share corners with eight equivalent LaSe8 hexagonal bipyramids, edges with four equivalent SrSe8 hexagonal bipyramids, and faces with eight equivalent LaSe8 hexagonal bipyramids. There are four shorter (3.12 Å) and four longer (3.30 Å) Sr–Se bond lengths. La3+ is bonded to eight equivalent Se2- atoms to form distorted LaSe8 hexagonal bipyramids that share corners with four equivalent SrSe8 hexagonal bipyramids, corners with four equivalent LaSe8 hexagonal bipyramids, edges with four equivalent LaSe8 hexagonal bipyramids, faces with four equivalent SrSe8 hexagonal bipyramids, and faces with four equivalent LaSe8 hexagonal bipyramids. There are a spread of La–Se bond distances ranging from 3.04–3.28 Å. Se2- is bonded to two equivalent Sr2+ and four equivalent La3+ atoms to form a mixture of distorted corner, edge, and face-sharing SeSr2La4 octahedra. The corner-sharing octahedra tilt angles range from 16–50°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaSe2 by Materials Project

LaSe2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. La3+ is bonded in a 9-coordinate geometry to nine Se+1.50- atoms. There are a spread of La–Se bond distances ranging from 3.03–3.32 Å. There are two inequivalent Se+1.50- sites. In the first Se+1.50- site, Se+1.50- is bonded in a 5-coordinate geometry to four equivalent La3+ and one Se+1.50- atom. The Se–Se bond length is 2.52 Å. In the second Se+1.50- site, Se+1.50- is bonded to five equivalent La3+ atoms to form a mixture of distorted edge and corner-sharing SeLa5 trigonal bipyramids.

36 MATERIALS SCIENCE↗