SEARCH · Search NASA
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.
PrC2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr4+ is bonded in a distorted q4 geometry to ten equivalent C2- atoms. There are two shorter (2.61 Å) and eight longer (2.82 Å) Pr–C bond lengths. C2- is bonded in a 6-coordinate geometry to five equivalent Pr4+ and one C2- atom. The C–C bond length is 1.30 Å.
Pr2C3 is Plutonium carbide structured and crystallizes in the cubic I-43d space group. The structure is three-dimensional. Pr3+ is bonded in a 9-coordinate geometry to nine equivalent C2- atoms. There are a spread of Pr–C bond distances ranging from 2.66–2.96 Å. C2- is bonded in a 5-coordinate geometry to six equivalent Pr3+ and one C2- atom. The C–C bond length is 1.33 Å.