Search NASA⌕ Search

SEARCH · Search NASA

Results for “Hf-S-Si”

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.

Materials Data on HfSiS by Materials Project

HfSiS is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Hf is bonded in a 9-coordinate geometry to four equivalent Si and five equivalent S atoms. All Hf–Si bond lengths are 2.79 Å. There are four shorter (2.65 Å) and one longer (2.84 Å) Hf–S bond lengths. Si is bonded to four equivalent Hf and four equivalent Si atoms to form a mixture of distorted corner, edge, and face-sharing SiHf4Si4 hexagonal bipyramids. All Si–Si bond lengths are 2.50 Å. S is bonded in a 5-coordinate geometry to five equivalent Hf atoms.

36 MATERIALS SCIENCE↗