Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “As-Ni”

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.

10 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1986

A nonmagmatic origin of group-IIE iron meteorites

New neutron activation data on 10 elements in 12 IIE and IIE-related irons lead to a reclassification of several irons. Seymchan and Lonaconing are removed from IIE, and Leshan added. Four IIE members are designated IIE-An to call attention to some anomalous properties. The eight normal IIE members define element-Ni trends generally similar to those in the nonmagmatic group IAB; the small negative slopes on W-Ni and Ir-Ni diagrams are strongly indicative of a nonmagmatic origin of the IIE irons. It is proposed that IIE irons like IAB irons originated as individual pools of impact-produced melt in the near-surface region of a chondritic parent body. The positive As-Ni and Au-Ni trends are the only evidence suggesting fractional crystallization, but their slopes are lower than those in magmatic group IIIAB, and only slightly higher than those of Cu and Sb in IAB. It is suggested that the S and C contents of the IIE precursor materials were much lower than those of the IAB precursors, thus higher temperatures were required to generate enough metallic melt to segregate into pools. These higher temperatures are also reflected in the nonchondritic compositions of the silicate inclusions.

Wasson, J. T.↗
DOE OSTI2020

Materials Data on NiAs2 by Materials Project

NiAs2 is Marcasite structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Ni2+ is bonded to six equivalent As1- atoms to form NiAs6 octahedra that share corners with eight equivalent NiAs6 octahedra, corners with six equivalent AsNi3As tetrahedra, and edges with two equivalent NiAs6 octahedra. The corner-sharing octahedral tilt angles are 58°. There are two shorter (2.36 Å) and four longer (2.40 Å) Ni–As bond lengths. As1- is bonded to three equivalent Ni2+ and one As1- atom to form distorted AsNi3As tetrahedra that share corners with three equivalent NiAs6 octahedra, corners with thirteen equivalent AsNi3As tetrahedra, and an edgeedge with one AsNi3As tetrahedra. The corner-sharing octahedra tilt angles range from 75–77°. The As–As bond length is 2.49 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiAs2 by Materials Project

NiAs2 is Pyrite-like structured and crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Ni2+ is bonded to six equivalent As1- atoms to form NiAs6 octahedra that share corners with twelve equivalent NiAs6 octahedra and corners with six equivalent AsNi3As trigonal pyramids. The corner-sharing octahedral tilt angles are 63°. All Ni–As bond lengths are 2.40 Å. As1- is bonded to three equivalent Ni2+ and one As1- atom to form distorted AsNi3As trigonal pyramids that share corners with three equivalent NiAs6 octahedra and corners with fifteen equivalent AsNi3As trigonal pyramids. The corner-sharing octahedral tilt angles are 80°. The As–As bond length is 2.47 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiAs by Materials Project

NiAs is Caswellsilverite-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ni3+ is bonded to six equivalent As3- atoms to form a mixture of distorted edge and corner-sharing NiAs6 pentagonal pyramids. All Ni–As bond lengths are 2.48 Å. As3- is bonded to six equivalent Ni3+ atoms to form a mixture of face, edge, and corner-sharing AsNi6 octahedra. The corner-sharing octahedral tilt angles are 48°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ni11As8 by Materials Project

Ni11As8 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional. there are six inequivalent Ni2+ sites. In the first Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form NiAs5 square pyramids that share corners with four equivalent NiAs5 square pyramids, corners with twelve NiAs5 trigonal bipyramids, edges with two equivalent NiAs6 octahedra, edges with two NiAs5 trigonal bipyramids, and faces with two NiAs5 trigonal bipyramids. There are a spread of Ni–As bond distances ranging from 2.35–2.49 Å. In the second Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share corners with three equivalent NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs5 square pyramid. The corner-sharing octahedra tilt angles range from 53–63°. There are a spread of Ni–As bond distances ranging from 2.38–2.46 Å. In the third Ni2+ site, Ni2+ is bonded to six As+2.75- atoms to form a mixture of face, edge, and corner-sharing NiAs6 octahedra. There are a spread of Ni–As bond distances ranging from 2.47–2.65 Å. In the fourth Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share a cornercorner with one NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, an edgeedge with one NiAs5 square pyramid, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs6 octahedra. The corner-sharing octahedral tilt angles are 63°. There are a spread of Ni–As bond distances ranging from 2.30–2.49 Å. In the fifth Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share corners with three equivalent NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs5 square pyramid. The corner-sharing octahedra tilt angles range from 53–63°. There are a spread of Ni–As bond distances ranging from 2.39–2.45 Å. In the sixth Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share a cornercorner with one NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, an edgeedge with one NiAs5 square pyramid, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs6 octahedra. The corner-sharing octahedral tilt angles are 63°. There are a spread of Ni–As bond distances ranging from 2.30–2.50 Å. There are five inequivalent As+2.75- sites. In the first As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms. In the second As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms. In the third As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms. In the fourth As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms. In the fifth As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiAs2 by Materials Project

NiAs2 is Pyrite-like structured and crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. Ni2+ is bonded to six As1- atoms to form NiAs6 octahedra that share corners with ten equivalent NiAs6 octahedra, corners with six AsNi3As tetrahedra, and an edgeedge with one NiAs6 octahedra. The corner-sharing octahedra tilt angles range from 55–65°. There are a spread of Ni–As bond distances ranging from 2.37–2.41 Å. There are two inequivalent As1- sites. In the first As1- site, As1- is bonded to three equivalent Ni2+ and one As1- atom to form distorted AsNi3As tetrahedra that share corners with three equivalent NiAs6 octahedra and corners with fifteen AsNi3As tetrahedra. The corner-sharing octahedra tilt angles range from 71–79°. The As–As bond length is 2.49 Å. In the second As1- site, As1- is bonded to three equivalent Ni2+ and one As1- atom to form distorted AsNi3As tetrahedra that share corners with three equivalent NiAs6 octahedra, corners with thirteen AsNi3As tetrahedra, and an edgeedge with one AsNi3As tetrahedra. The corner-sharing octahedra tilt angles range from 75–84°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiAs by Materials Project

NiAs is Molybdenum Carbide MAX Phase-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ni3+ is bonded to six equivalent As3- atoms to form a mixture of face, edge, and corner-sharing NiAs6 octahedra. The corner-sharing octahedral tilt angles are 51°. All Ni–As bond lengths are 2.45 Å. As3- is bonded in a 6-coordinate geometry to six equivalent Ni3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ni5As2 by Materials Project

Ni5As2 crystallizes in the hexagonal P6_3cm space group. The structure is three-dimensional. there are six inequivalent Ni+1.20+ sites. In the first Ni+1.20+ site, Ni+1.20+ is bonded to four As3- atoms to form NiAs4 tetrahedra that share corners with three equivalent NiAs5 square pyramids, corners with twelve NiAs4 tetrahedra, edges with three equivalent NiAs5 square pyramids, and edges with three equivalent NiAs4 tetrahedra. There are three shorter (2.43 Å) and one longer (2.45 Å) Ni–As bond lengths. In the second Ni+1.20+ site, Ni+1.20+ is bonded to four As3- atoms to form NiAs4 tetrahedra that share corners with six equivalent NiAs5 square pyramids, corners with twelve NiAs4 tetrahedra, edges with three equivalent NiAs5 square pyramids, and edges with three equivalent NiAs4 tetrahedra. There are three shorter (2.45 Å) and one longer (2.52 Å) Ni–As bond lengths. In the third Ni+1.20+ site, Ni+1.20+ is bonded in a trigonal non-coplanar geometry to three As3- atoms. All Ni–As bond lengths are 2.38 Å. In the fourth Ni+1.20+ site, Ni+1.20+ is bonded to four As3- atoms to form distorted NiAs4 tetrahedra that share corners with seven equivalent NiAs5 square pyramids, corners with twelve NiAs4 tetrahedra, an edgeedge with one NiAs5 square pyramid, and edges with five NiAs4 tetrahedra. There are a spread of Ni–As bond distances ranging from 2.35–2.60 Å. In the fifth Ni+1.20+ site, Ni+1.20+ is bonded to four As3- atoms to form NiAs4 tetrahedra that share corners with two equivalent NiAs5 square pyramids, corners with fourteen NiAs4 tetrahedra, edges with two equivalent NiAs5 square pyramids, edges with four NiAs4 tetrahedra, and a faceface with one NiAs5 square pyramid. There are a spread of Ni–As bond distances ranging from 2.31–2.44 Å. In the sixth Ni+1.20+ site, Ni+1.20+ is bonded to five As3- atoms to form distorted NiAs5 square pyramids that share corners with two equivalent NiAs5 square pyramids, corners with fourteen NiAs4 tetrahedra, edges with four equivalent NiAs5 square pyramids, edges with six NiAs4 tetrahedra, and a faceface with one NiAs4 tetrahedra. There are a spread of Ni–As bond distances ranging from 2.31–2.74 Å. There are three inequivalent As3- sites. In the first As3- site, As3- is bonded in a 10-coordinate geometry to ten Ni+1.20+ atoms. In the second As3- site, As3- is bonded in a 10-coordinate geometry to ten Ni+1.20+ atoms. In the third As3- site, As3- is bonded in a 10-coordinate geometry to ten Ni+1.20+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ni3As by Materials Project

Ni3As crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ni1+ is bonded in a see-saw-like geometry to four equivalent As3- atoms. There are two shorter (2.52 Å) and two longer (2.55 Å) Ni–As bond lengths. As3- is bonded to twelve equivalent Ni1+ atoms to form a mixture of corner and face-sharing AsNi12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ni11As8 by Materials Project

Ni11As8 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are six inequivalent Ni2+ sites. In the first Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share a cornercorner with one NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, an edgeedge with one NiAs5 square pyramid, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs6 octahedra. The corner-sharing octahedral tilt angles are 63°. There are a spread of Ni–As bond distances ranging from 2.31–2.51 Å. In the second Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share corners with three equivalent NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs5 square pyramid. The corner-sharing octahedra tilt angles range from 53–63°. There are a spread of Ni–As bond distances ranging from 2.39–2.45 Å. In the third Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share corners with three equivalent NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs5 square pyramid. The corner-sharing octahedra tilt angles range from 53–63°. There are a spread of Ni–As bond distances ranging from 2.39–2.47 Å. In the fourth Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form NiAs5 square pyramids that share corners with four equivalent NiAs5 square pyramids, corners with twelve NiAs5 trigonal bipyramids, edges with two equivalent NiAs6 octahedra, edges with two NiAs5 trigonal bipyramids, and faces with two NiAs5 trigonal bipyramids. There are a spread of Ni–As bond distances ranging from 2.35–2.49 Å. In the fifth Ni2+ site, Ni2+ is bonded to five As+2.75- atoms to form distorted NiAs5 trigonal bipyramids that share a cornercorner with one NiAs6 octahedra, corners with three equivalent NiAs5 square pyramids, corners with eleven NiAs5 trigonal bipyramids, an edgeedge with one NiAs5 square pyramid, edges with five NiAs5 trigonal bipyramids, and a faceface with one NiAs6 octahedra. The corner-sharing octahedral tilt angles are 62°. There are a spread of Ni–As bond distances ranging from 2.31–2.50 Å. In the sixth Ni2+ site, Ni2+ is bonded to six As+2.75- atoms to form a mixture of corner, edge, and face-sharing NiAs6 octahedra. There are a spread of Ni–As bond distances ranging from 2.48–2.65 Å. There are five inequivalent As+2.75- sites. In the first As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms. In the second As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms. In the third As+2.75- site, As+2.75- is bonded in a distorted hexagonal pyramidal geometry to seven Ni2+ atoms. In the fourth As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms. In the fifth As+2.75- site, As+2.75- is bonded in a 7-coordinate geometry to seven Ni2+ atoms.

36 MATERIALS SCIENCE↗