Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “VS4”

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.

34 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on VCu13As3S16 by Materials Project

VCu13As3S16 crystallizes in the cubic P-43n space group. The structure is three-dimensional. V4+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share corners with four equivalent CuS4 tetrahedra and edges with six equivalent CuS4 tetrahedra. All V–S bond lengths are 2.22 Å. There are three inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four S2- atoms to form CuS4 tetrahedra that share corners with two equivalent AsS4 tetrahedra, corners with ten CuS4 tetrahedra, and an edgeedge with one VS4 tetrahedra. There are two shorter (2.29 Å) and two longer (2.32 Å) Cu–S bond lengths. In the second Cu1+ site, Cu1+ is bonded to four S2- atoms to form CuS4 tetrahedra that share a cornercorner with one VS4 tetrahedra, corners with three equivalent AsS4 tetrahedra, and corners with nine CuS4 tetrahedra. There are three shorter (2.27 Å) and one longer (2.38 Å) Cu–S bond lengths. In the third Cu1+ site, Cu1+ is bonded to four equivalent S2- atoms to form CuS4 tetrahedra that share corners with four equivalent AsS4 tetrahedra and corners with eight CuS4 tetrahedra. All Cu–S bond lengths are 2.28 Å. As5+ is bonded to four equivalent S2- atoms to form AsS4 tetrahedra that share corners with twelve CuS4 tetrahedra. All As–S bond lengths are 2.31 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to one V4+ and four Cu1+ atoms to form distorted SVCu4 trigonal bipyramids that share corners with nine equivalent SCu3As tetrahedra and edges with three equivalent SVCu4 trigonal bipyramids. In the second S2- site, S2- is bonded to three Cu1+ and one As5+ atom to form SCu3As tetrahedra that share corners with nine equivalent SCu3As tetrahedra and corners with three equivalent SVCu4 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on VS4N3 by Materials Project

(VS4)2(N2)3 is Iron carbide-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of twelve ammonia molecules and four VS4 clusters. In each VS4 cluster, V5+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of V–S bond distances ranging from 2.11–2.13 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a single-bond geometry to one V5+ atom. In the second S2- site, S2- is bonded in a single-bond geometry to one V5+ atom. In the third S2- site, S2- is bonded in a single-bond geometry to one V5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaNaVS4 by Materials Project

NaBaVS4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Na1+ is bonded to six S2- atoms to form distorted NaS6 pentagonal pyramids that share corners with four equivalent VS4 tetrahedra, edges with two equivalent NaS6 pentagonal pyramids, and an edgeedge with one VS4 tetrahedra. There are a spread of Na–S bond distances ranging from 2.87–3.33 Å. Ba2+ is bonded in a 9-coordinate geometry to nine S2- atoms. There are a spread of Ba–S bond distances ranging from 3.19–3.46 Å. V5+ is bonded to four S2- atoms to form VS4 tetrahedra that share corners with four equivalent NaS6 pentagonal pyramids and an edgeedge with one NaS6 pentagonal pyramid. There are two shorter (2.15 Å) and two longer (2.17 Å) V–S bond lengths. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to two equivalent Na1+, two equivalent Ba2+, and one V5+ atom. In the second S2- site, S2- is bonded in a 1-coordinate geometry to one Na1+, three equivalent Ba2+, and one V5+ atom. In the third S2- site, S2- is bonded in a 5-coordinate geometry to two equivalent Na1+, two equivalent Ba2+, and one V5+ atom. In the fourth S2- site, S2- is bonded in a 4-coordinate geometry to one Na1+, two equivalent Ba2+, and one V5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on VCu12Sn(AsS8)2 by Materials Project

VCu12Sn(AsS8)2 is Stannite-derived structured and crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share corners with twelve CuS4 tetrahedra. All V–S bond lengths are 2.21 Å. There are two inequivalent Cu+1.08+ sites. In the first Cu+1.08+ site, Cu+1.08+ is bonded to four S2- atoms to form CuS4 tetrahedra that share a cornercorner with one VS4 tetrahedra, a cornercorner with one SnS4 tetrahedra, corners with two equivalent AsS4 tetrahedra, and corners with eight equivalent CuS4 tetrahedra. There are a spread of Cu–S bond distances ranging from 2.27–2.33 Å. In the second Cu+1.08+ site, Cu+1.08+ is bonded to four S2- atoms to form CuS4 tetrahedra that share a cornercorner with one VS4 tetrahedra, a cornercorner with one SnS4 tetrahedra, corners with two equivalent AsS4 tetrahedra, and corners with eight CuS4 tetrahedra. There are a spread of Cu–S bond distances ranging from 2.26–2.32 Å. Sn4+ is bonded to four equivalent S2- atoms to form SnS4 tetrahedra that share corners with twelve CuS4 tetrahedra. All Sn–S bond lengths are 2.47 Å. As5+ is bonded to four equivalent S2- atoms to form AsS4 tetrahedra that share corners with twelve CuS4 tetrahedra. All As–S bond lengths are 2.32 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded to three Cu+1.08+ and one Sn4+ atom to form corner-sharing SCu3Sn tetrahedra. In the second S2- site, S2- is bonded to three Cu+1.08+ and one As5+ atom to form corner-sharing SCu3As tetrahedra. In the third S2- site, S2- is bonded to one V5+ and three Cu+1.08+ atoms to form corner-sharing SVCu3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Microwave-Based Synthesis of Functional Morphological Variants and Carbon Nanotube-Based Composites of VS 4 for Electrochemical Applications

A novel facile, fast, and efficient microwave-assisted method was developed to synthesize a number of diverse nanostructured motifs (ranging from nanorods to nanoflowers) of VS 4 along with its associated composite heterostructures, VS 4 /multi-walled carbon nanotube (MWNT; i.e., multi-walled carbon nanotubes). Specifically, we have probed and correlated the effects of a number of specific experimental variables, including primarily precursor, solvent, temperature, and time. We noted that nanorods formed more readily with VO(acac) 2 as the vanadium precursor and n-methyl-2-pyrrolidone (NMP) as a polar reaction solvent. By contrast, we determined that hierarchical three-dimensional (3D) nanoflower-like assemblies, ranging in size from 100 to 200 nm in average diameter, could be controllably synthesized by using Na 3 VO 4 as the vanadium precursor and an aqueous water: polar solvent mixture as the reaction medium. We also observed that VS 4 disintegrates, when in the presence of either air, solution, or a combination of these environments, and established that the extent of VS4 nanorod decomposition could be almost fully prevented by storage under nitrogen. From an application’s perspective, our VS 4 is electrochemically active and shows behavior, consistent with the literature. In particular, as compared with pristine VS 4 nanorods alone, we observed enhanced electrochemical activity with (i) 3D hierarchical flower-like motifs, (ii) unique necklace-like VS 4 nanorod–MWNT composites, and (iii) samples in which as-prepared VS4 nanorods had been annealed. Moreover, we found that the rational application of specific physical and chemical processing treatments, such as (i) thermal annealing to improve crystallinity, (ii) the addition of MWNTs to form conductive composites, and (iii) the evolution of morphology from one-dimensional (1D) nanorods to more complex 3D nanoflowers, was favorable to the resulting electrochemical performance with respect to increasing stability and reversibility.

25 ENERGY STORAGE↗
DOE OSTI2020

Materials Data on VCu3S4 by Materials Project

Cu3VS4 is Sulvanite structured and crystallizes in the cubic P-43m space group. The structure is three-dimensional. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share edges with six equivalent CuS4 tetrahedra. All V–S bond lengths are 2.21 Å. Cu1+ is bonded to four equivalent S2- atoms to form CuS4 tetrahedra that share corners with eight equivalent CuS4 tetrahedra and edges with two equivalent VS4 tetrahedra. All Cu–S bond lengths are 2.30 Å. S2- is bonded to one V5+ and three equivalent Cu1+ atoms to form a mixture of distorted corner and edge-sharing SVCu3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2LiVS4 by Materials Project

Cs2LiVS4 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Cs1+ is bonded in a 8-coordinate geometry to eight equivalent S2- atoms. There are a spread of Cs–S bond distances ranging from 3.60–3.94 Å. Li1+ is bonded to four equivalent S2- atoms to form distorted LiS4 tetrahedra that share edges with two equivalent VS4 tetrahedra. All Li–S bond lengths are 2.44 Å. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share edges with two equivalent LiS4 tetrahedra. All V–S bond lengths are 2.16 Å. S2- is bonded in a 2-coordinate geometry to four equivalent Cs1+, one Li1+, and one V5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2LiVS4 by Materials Project

Rb2LiVS4 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Rb1+ is bonded in a 8-coordinate geometry to eight equivalent S2- atoms. There are a spread of Rb–S bond distances ranging from 3.48–3.83 Å. Li1+ is bonded to four equivalent S2- atoms to form distorted LiS4 tetrahedra that share edges with two equivalent VS4 tetrahedra. All Li–S bond lengths are 2.43 Å. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share edges with two equivalent LiS4 tetrahedra. All V–S bond lengths are 2.16 Å. S2- is bonded in a 2-coordinate geometry to four equivalent Rb1+, one Li1+, and one V5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li3VS4 by Materials Project

Li3VS4 is Sulvanite structured and crystallizes in the cubic P-43m space group. The structure is three-dimensional. Li1+ is bonded to four equivalent S2- atoms to form distorted LiS4 tetrahedra that share corners with eight equivalent LiS4 tetrahedra and edges with two equivalent VS4 tetrahedra. All Li–S bond lengths are 2.47 Å. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share edges with six equivalent LiS4 tetrahedra. All V–S bond lengths are 2.16 Å. S2- is bonded to three equivalent Li1+ and one V5+ atom to form a mixture of edge and corner-sharing SLi3V trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2VAgS4 by Materials Project

Cs2VAgS4 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Cs1+ is bonded in a 8-coordinate geometry to eight equivalent S2- atoms. There are a spread of Cs–S bond distances ranging from 3.55–3.98 Å. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share edges with two equivalent AgS4 tetrahedra. All V–S bond lengths are 2.19 Å. Ag1+ is bonded to four equivalent S2- atoms to form distorted AgS4 tetrahedra that share edges with two equivalent VS4 tetrahedra. All Ag–S bond lengths are 2.53 Å. S2- is bonded in a 1-coordinate geometry to four equivalent Cs1+, one V5+, and one Ag1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2VAgS4 by Materials Project

K2VAgS4 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight equivalent S2- atoms. There are a spread of K–S bond distances ranging from 3.32–3.78 Å. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share edges with two equivalent AgS4 tetrahedra. All V–S bond lengths are 2.19 Å. Ag1+ is bonded to four equivalent S2- atoms to form distorted AgS4 tetrahedra that share edges with two equivalent VS4 tetrahedra. All Ag–S bond lengths are 2.53 Å. S2- is bonded in a 1-coordinate geometry to four equivalent K1+, one V5+, and one Ag1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2VAgS4 by Materials Project

Rb2VAgS4 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Rb1+ is bonded in a 8-coordinate geometry to eight equivalent S2- atoms. There are a spread of Rb–S bond distances ranging from 3.42–3.86 Å. V5+ is bonded to four equivalent S2- atoms to form VS4 tetrahedra that share edges with two equivalent AgS4 tetrahedra. All V–S bond lengths are 2.19 Å. Ag1+ is bonded to four equivalent S2- atoms to form distorted AgS4 tetrahedra that share edges with two equivalent VS4 tetrahedra. All Ag–S bond lengths are 2.53 Å. S2- is bonded in a 1-coordinate geometry to four equivalent Rb1+, one V5+, and one Ag1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V3S by Materials Project

V3S crystallizes in the tetragonal P4_2/nbc space group. The structure is three-dimensional. there are three inequivalent V sites. In the first V site, V is bonded in a distorted bent 150 degrees geometry to two equivalent S atoms. Both V–S bond lengths are 2.36 Å. In the second V site, V is bonded in a distorted bent 150 degrees geometry to two equivalent S atoms. Both V–S bond lengths are 2.36 Å. In the third V site, V is bonded to four equivalent S atoms to form a mixture of distorted edge and corner-sharing VS4 tetrahedra. All V–S bond lengths are 2.39 Å. S is bonded in a 8-coordinate geometry to eight V atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V3S by Materials Project

V3S crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. there are three inequivalent V sites. In the first V site, V is bonded in a distorted water-like geometry to two equivalent S atoms. Both V–S bond lengths are 2.33 Å. In the second V site, V is bonded in a distorted water-like geometry to two equivalent S atoms. Both V–S bond lengths are 2.38 Å. In the third V site, V is bonded to four equivalent S atoms to form a mixture of distorted edge and corner-sharing VS4 tetrahedra. There are two shorter (2.37 Å) and two longer (2.41 Å) V–S bond lengths. S is bonded in a 8-coordinate geometry to eight V atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on VS2 by Materials Project

VS2 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. V4+ is bonded to four equivalent S2- atoms to form corner-sharing VS4 tetrahedra. All V–S bond lengths are 2.22 Å. S2- is bonded in a bent 120 degrees geometry to two equivalent V4+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1990

Reactivity of pi-complexes of Ti, V, and Nb towards dithioacetic acid: Synthesis and structure of novel metal sulfur-containing complexes

In order to use sulfur-containing resources economically and with minimal environmental damage, it is important to understand the desulfurization processes. Hydrodesulfurization, for example, is carried out on the surface of a heterogeneous metal sulfide catalyst. Studies of simple, soluble inorganic systems provide information regarding the structure and reactivity of sulfur-containing compounds with metal complexes. Further, consistent with recent trends in materials chemistry, many model compounds warrant further study as catalyst precursors. The reactivity of low-valent organometallic sandwich pi-complexes toward dithiocarboxylic acids is described. For example, treatment of bisbenzene vanadium with CH3CSSH affords a divanadium tetrakis(dithioacetate) complex. The crystallographically determined V-V bond distance, 2.800(2), is nearly the same as the V-V bond distance in a V(mu-nu squared-S2)2V' unit in the mineral patonite (VS4)n. The stability of the V2S4 core in the dimer is demonstrated by evidence of V2S4(+) in the mass spectrum (70 eV, solid probe) of the vanadium dimer. Several other systems relevant to HDS catalysis are also discussed.

Duraj, Stan A.↗