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.
TcNiAl2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two TcNiAl2 ribbons oriented in the (1, 0, 0) direction. Tc is bonded in a linear geometry to two equivalent Al atoms. Both Tc–Al bond lengths are 2.44 Å. Ni is bonded in a linear geometry to two equivalent Al atoms. Both Ni–Al bond lengths are 2.33 Å. Al is bonded in a linear geometry to one Tc and one Ni atom.
TcRh crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Tc3- is bonded to six equivalent Tc3- and six equivalent Rh3+ atoms to form a mixture of distorted corner, edge, and face-sharing TcTc6Rh6 cuboctahedra. All Tc–Tc bond lengths are 2.74 Å. All Tc–Rh bond lengths are 2.70 Å. Rh3+ is bonded in a 6-coordinate geometry to six equivalent Tc3- atoms.
Tc3Al is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Tc1- is bonded to eight equivalent Tc1- and four equivalent Al3+ atoms to form distorted TcAl4Tc8 cuboctahedra that share corners with four equivalent AlTc12 cuboctahedra, corners with fourteen equivalent TcAl4Tc8 cuboctahedra, edges with six equivalent AlTc12 cuboctahedra, edges with twelve equivalent TcAl4Tc8 cuboctahedra, faces with four equivalent AlTc12 cuboctahedra, and faces with sixteen equivalent TcAl4Tc8 cuboctahedra. There are a spread of Tc–Tc bond distances ranging from 2.64–2.79 Å. There are two shorter (2.71 Å) and two longer (2.74 Å) Tc–Al bond lengths. Al3+ is bonded to twelve equivalent Tc1- atoms to form AlTc12 cuboctahedra that share corners with six equivalent AlTc12 cuboctahedra, corners with twelve equivalent TcAl4Tc8 cuboctahedra, edges with eighteen equivalent TcAl4Tc8 cuboctahedra, faces with eight equivalent AlTc12 cuboctahedra, and faces with twelve equivalent TcAl4Tc8 cuboctahedra.
Hf2TcZn is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to four equivalent Tc and four equivalent Zn atoms. All Hf–Tc bond lengths are 2.85 Å. All Hf–Zn bond lengths are 2.85 Å. Tc is bonded in a body-centered cubic geometry to eight equivalent Hf atoms. Zn is bonded in a body-centered cubic geometry to eight equivalent Hf atoms.
V2WTc crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two V2WTc ribbons oriented in the (1, 0, 0) direction. V is bonded in a linear geometry to one W and one Tc atom. The V–W bond length is 2.24 Å. The V–Tc bond length is 2.23 Å. W is bonded in a linear geometry to two equivalent V atoms. Tc is bonded in a linear geometry to two equivalent V atoms.
V2MoTc crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two V2MoTc ribbons oriented in the (1, 0, 0) direction. V is bonded in a linear geometry to one Mo and one Tc atom. The V–Mo bond length is 2.18 Å. The V–Tc bond length is 2.17 Å. Mo is bonded in a linear geometry to two equivalent V atoms. Tc is bonded in a linear geometry to two equivalent V atoms.
Zr2TcNi is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Zr is bonded in a body-centered cubic geometry to four equivalent Tc and four equivalent Ni atoms. All Zr–Tc bond lengths are 2.83 Å. All Zr–Ni bond lengths are 2.83 Å. Tc is bonded in a body-centered cubic geometry to eight equivalent Zr atoms. Ni is bonded in a body-centered cubic geometry to eight equivalent Zr atoms.
Zr2CrTc crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Zr2CrTc ribbons oriented in the (1, 0, 0) direction. Zr is bonded in a linear geometry to one Cr and one Tc atom. The Zr–Cr bond length is 2.97 Å. The Zr–Tc bond length is 2.25 Å. Cr is bonded in a linear geometry to two equivalent Zr atoms. Tc is bonded in a linear geometry to two equivalent Zr atoms.
CrTcGe2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two CrTcGe2 ribbons oriented in the (1, 0, 0) direction. Cr is bonded in a linear geometry to two equivalent Ge atoms. Both Cr–Ge bond lengths are 2.44 Å. Tc is bonded in a linear geometry to two equivalent Ge atoms. Both Tc–Ge bond lengths are 2.36 Å. Ge is bonded in a linear geometry to one Cr and one Tc atom.
Zr2TcRu is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Zr is bonded in a body-centered cubic geometry to four equivalent Tc and four equivalent Ru atoms. All Zr–Tc bond lengths are 2.85 Å. All Zr–Ru bond lengths are 2.85 Å. Tc is bonded in a body-centered cubic geometry to eight equivalent Zr atoms. Ru is bonded in a body-centered cubic geometry to eight equivalent Zr atoms.
TcIrAl2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two TcIrAl2 ribbons oriented in the (1, 0, 0) direction. Tc is bonded in a linear geometry to two equivalent Al atoms. Both Tc–Al bond lengths are 2.43 Å. Ir is bonded in a linear geometry to two equivalent Al atoms. Both Ir–Al bond lengths are 2.38 Å. Al is bonded in a linear geometry to one Tc and one Ir atom.
TcCo crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Tc3- is bonded to six equivalent Tc3- and six equivalent Co3+ atoms to form a mixture of edge, face, and corner-sharing TcCo6Tc6 cuboctahedra. All Tc–Tc bond lengths are 2.66 Å. All Tc–Co bond lengths are 2.57 Å. Co3+ is bonded in a 6-coordinate geometry to six equivalent Tc3- atoms.
Pu2TcB6 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are two inequivalent Pu+3.50+ sites. In the first Pu+3.50+ site, Pu+3.50+ is bonded in a 2-coordinate geometry to three equivalent Tc1- and fourteen B1- atoms. There are a spread of Pu–Tc bond distances ranging from 3.02–3.15 Å. There are a spread of Pu–B bond distances ranging from 2.61–2.76 Å. In the second Pu+3.50+ site, Pu+3.50+ is bonded in a 12-coordinate geometry to one Pu+3.50+, two equivalent Tc1-, and twelve B1- atoms. The Pu–Pu bond length is 2.63 Å. There are one shorter (2.97 Å) and one longer (2.98 Å) Pu–Tc bond lengths. There are a spread of Pu–B bond distances ranging from 2.63–2.69 Å. Tc1- is bonded in a 10-coordinate geometry to five Pu+3.50+ and ten B1- atoms. There are a spread of Tc–B bond distances ranging from 2.34–2.40 Å. There are six inequivalent B1- sites. In the first B1- site, B1- is bonded in a 8-coordinate geometry to six Pu+3.50+ and two B1- atoms. Both B–B bond lengths are 1.68 Å. In the second B1- site, B1- is bonded in a 3-coordinate geometry to four equivalent Pu+3.50+, two equivalent Tc1-, and three B1- atoms. There are a spread of B–B bond distances ranging from 1.78–1.81 Å. In the third B1- site, B1- is bonded in a 3-coordinate geometry to four Pu+3.50+, two equivalent Tc1-, and three B1- atoms. The B–B bond length is 1.82 Å. In the fourth B1- site, B1- is bonded in a 9-coordinate geometry to four Pu+3.50+, two equivalent Tc1-, and three B1- atoms. There is one shorter (1.75 Å) and one longer (1.80 Å) B–B bond length. In the fifth B1- site, B1- is bonded in a 3-coordinate geometry to four Pu+3.50+, two equivalent Tc1-, and three B1- atoms. The B–B bond length is 1.82 Å. In the sixth B1- site, B1- is bonded in a 9-coordinate geometry to four Pu+3.50+, two equivalent Tc1-, and three B1- atoms.
Ta2NbTc crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Ta2NbTc ribbons oriented in the (1, 0, 0) direction. Ta is bonded in a linear geometry to one Nb and one Tc atom. The Ta–Nb bond length is 2.39 Å. The Ta–Tc bond length is 2.25 Å. Nb is bonded in a linear geometry to two equivalent Ta atoms. Tc is bonded in a linear geometry to two equivalent Ta atoms.
TcIr crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Tc3- is bonded to six equivalent Tc3- and six equivalent Ir3+ atoms to form a mixture of distorted edge, face, and corner-sharing TcTc6Ir6 cuboctahedra. All Tc–Tc bond lengths are 2.76 Å. All Tc–Ir bond lengths are 2.71 Å. Ir3+ is bonded in a 6-coordinate geometry to six equivalent Tc3- atoms.
Lu2TcCd is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Lu is bonded in a body-centered cubic geometry to four equivalent Tc and four equivalent Cd atoms. All Lu–Tc bond lengths are 3.03 Å. All Lu–Cd bond lengths are 3.03 Å. Tc is bonded in a body-centered cubic geometry to eight equivalent Lu atoms. Cd is bonded in a body-centered cubic geometry to eight equivalent Lu atoms.
Nb2TcFe crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Nb2TcFe ribbons oriented in the (1, 0, 0) direction. Nb is bonded in a linear geometry to one Tc and one Fe atom. The Nb–Tc bond length is 2.20 Å. The Nb–Fe bond length is 2.10 Å. Tc is bonded in a linear geometry to two equivalent Nb atoms. Fe is bonded in a linear geometry to two equivalent Nb atoms.
Nb2TcRh crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Nb2TcRh ribbons oriented in the (1, 0, 0) direction. Nb is bonded in a linear geometry to one Tc and one Rh atom. The Nb–Tc bond length is 2.20 Å. The Nb–Rh bond length is 2.30 Å. Tc is bonded in a linear geometry to two equivalent Nb atoms. Rh is bonded in a linear geometry to two equivalent Nb atoms.