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.
ReTc crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Re3+ is bonded in a 6-coordinate geometry to six equivalent Tc3- atoms. All Re–Tc bond lengths are 2.75 Å. Tc3- is bonded to six equivalent Re3+ and six equivalent Tc3- atoms to form a mixture of corner, edge, and face-sharing TcRe6Tc6 cuboctahedra. All Tc–Tc bond lengths are 2.77 Å.
Sn2TcReO6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Re7+ is bonded to six equivalent O2- atoms to form ReO6 octahedra that share corners with six equivalent TcO6 octahedra and faces with eight equivalent SnO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Re–O bond lengths are 1.97 Å. Tc3- is bonded to six equivalent O2- atoms to form TcO6 octahedra that share corners with six equivalent ReO6 octahedra and faces with eight equivalent SnO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Tc–O bond lengths are 2.03 Å. Sn4+ is bonded to twelve equivalent O2- atoms to form SnO12 cuboctahedra that share corners with twelve equivalent SnO12 cuboctahedra, faces with six equivalent SnO12 cuboctahedra, faces with four equivalent ReO6 octahedra, and faces with four equivalent TcO6 octahedra. All Sn–O bond lengths are 2.83 Å. O2- is bonded in a linear geometry to one Re7+, one Tc3-, and four equivalent Sn4+ atoms.