SEARCH · Engineering Papers
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.
TaTe4 crystallizes in the tetragonal P4/mcc space group. The structure is one-dimensional and consists of one TaTe4 ribbon oriented in the (0, 0, 1) direction. Ta5+ is bonded in a 8-coordinate geometry to eight equivalent Te+1.25- atoms. All Ta–Te bond lengths are 2.90 Å. Te+1.25- is bonded in a 2-coordinate geometry to two equivalent Ta5+ atoms.
CuTa2InTe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Ta3+ is bonded to four equivalent Te2- atoms to form TaTe4 tetrahedra that share corners with four equivalent TaTe4 tetrahedra, corners with four equivalent CuTe4 tetrahedra, and corners with four equivalent InTe4 tetrahedra. All Ta–Te bond lengths are 2.73 Å. Cu1+ is bonded to four equivalent Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent InTe4 tetrahedra and corners with eight equivalent TaTe4 tetrahedra. All Cu–Te bond lengths are 2.63 Å. In1+ is bonded to four equivalent Te2- atoms to form InTe4 tetrahedra that share corners with four equivalent CuTe4 tetrahedra and corners with eight equivalent TaTe4 tetrahedra. All In–Te bond lengths are 3.16 Å. Te2- is bonded to two equivalent Ta3+, one Cu1+, and one In1+ atom to form distorted corner-sharing TeTa2InCu tetrahedra.
CsTa(CuTe2)2 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. Cs1+ is bonded in a 9-coordinate geometry to nine Te2- atoms. There are a spread of Cs–Te bond distances ranging from 3.86–4.30 Å. Ta5+ is bonded to four Te2- atoms to form TaTe4 tetrahedra that share edges with four CuTe4 tetrahedra. There are a spread of Ta–Te bond distances ranging from 2.63–2.67 Å. There are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with six CuTe4 tetrahedra and edges with two equivalent TaTe4 tetrahedra. There are a spread of Cu–Te bond distances ranging from 2.62–2.64 Å. In the second Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent CuTe4 tetrahedra and edges with two equivalent TaTe4 tetrahedra. There are two shorter (2.62 Å) and two longer (2.63 Å) Cu–Te bond lengths. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 5-coordinate geometry to two equivalent Cs1+, one Ta5+, and two Cu1+ atoms. In the second Te2- site, Te2- is bonded in a 3-coordinate geometry to two equivalent Cs1+, one Ta5+, and two Cu1+ atoms. In the third Te2- site, Te2- is bonded in a 5-coordinate geometry to one Cs1+, one Ta5+, and three Cu1+ atoms. In the fourth Te2- site, Te2- is bonded in a 6-coordinate geometry to four equivalent Cs1+, one Ta5+, and one Cu1+ atom.
RbTaCu2Te4 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. Rb1+ is bonded in a 9-coordinate geometry to nine Te2- atoms. There are a spread of Rb–Te bond distances ranging from 3.65–4.17 Å. Ta5+ is bonded to four Te2- atoms to form TaTe4 tetrahedra that share edges with four CuTe4 tetrahedra. There are a spread of Ta–Te bond distances ranging from 2.63–2.67 Å. There are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent CuTe4 tetrahedra and edges with two equivalent TaTe4 tetrahedra. There are three shorter (2.62 Å) and one longer (2.63 Å) Cu–Te bond lengths. In the second Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with six CuTe4 tetrahedra and edges with two equivalent TaTe4 tetrahedra. All Cu–Te bond lengths are 2.62 Å. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 5-coordinate geometry to two equivalent Rb1+, one Ta5+, and two Cu1+ atoms. In the second Te2- site, Te2- is bonded in a 5-coordinate geometry to one Rb1+, one Ta5+, and three Cu1+ atoms. In the third Te2- site, Te2- is bonded in a 5-coordinate geometry to two equivalent Rb1+, one Ta5+, and two Cu1+ atoms. In the fourth Te2- site, Te2- is bonded in a 6-coordinate geometry to four equivalent Rb1+, one Ta5+, and one Cu1+ atom.
TaCu3Te4 is Sulvanite structured and crystallizes in the cubic P-43m space group. The structure is three-dimensional. Ta5+ is bonded to four equivalent Te2- atoms to form TaTe4 tetrahedra that share edges with six equivalent CuTe4 tetrahedra. All Ta–Te bond lengths are 2.67 Å. Cu1+ is bonded to four equivalent Te2- atoms to form CuTe4 tetrahedra that share corners with eight equivalent CuTe4 tetrahedra and edges with two equivalent TaTe4 tetrahedra. All Cu–Te bond lengths are 2.62 Å. Te2- is bonded to one Ta5+ and three equivalent Cu1+ atoms to form a mixture of distorted corner and edge-sharing TeTaCu3 tetrahedra.