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At least 55 records · Page 3
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Zr2(NiP)3 by Materials Project

Zr2Ni3P3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Zr2+ sites. In the first Zr2+ site, Zr2+ is bonded in a 6-coordinate geometry to six P3- atoms. There are a spread of Zr–P bond distances ranging from 2.72–2.87 Å. In the second Zr2+ site, Zr2+ is bonded to six P3- atoms to form ZrP6 octahedra that share corners with nine NiP4 tetrahedra, edges with four equivalent ZrP6 octahedra, edges with four NiP4 tetrahedra, and a faceface with one NiP4 tetrahedra. There are a spread of Zr–P bond distances ranging from 2.62–2.73 Å. There are three inequivalent Ni+1.67+ sites. In the first Ni+1.67+ site, Ni+1.67+ is bonded to four P3- atoms to form NiP4 tetrahedra that share corners with three equivalent ZrP6 octahedra, corners with eight NiP4 tetrahedra, edges with two equivalent ZrP6 octahedra, and edges with three NiP4 tetrahedra. The corner-sharing octahedra tilt angles range from 25–48°. There are one shorter (2.26 Å) and three longer (2.34 Å) Ni–P bond lengths. In the second Ni+1.67+ site, Ni+1.67+ is bonded to four P3- atoms to form NiP4 tetrahedra that share corners with five equivalent ZrP6 octahedra, corners with eight NiP4 tetrahedra, edges with two equivalent NiP4 tetrahedra, and a faceface with one ZrP6 octahedra. The corner-sharing octahedra tilt angles range from 47–71°. There are a spread of Ni–P bond distances ranging from 2.20–2.27 Å. In the third Ni+1.67+ site, Ni+1.67+ is bonded to four P3- atoms to form NiP4 tetrahedra that share a cornercorner with one ZrP6 octahedra, corners with twelve NiP4 tetrahedra, edges with two equivalent ZrP6 octahedra, and edges with three NiP4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. There are a spread of Ni–P bond distances ranging from 2.26–2.33 Å. There are three inequivalent P3- sites. In the first P3- site, P3- is bonded to five Zr2+ and two Ni+1.67+ atoms to form distorted edge-sharing PZr5Ni2 pentagonal bipyramids. In the second P3- site, P3- is bonded in a 9-coordinate geometry to three Zr2+ and six Ni+1.67+ atoms. In the third P3- site, P3- is bonded in a 8-coordinate geometry to four Zr2+ and four Ni+1.67+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb(NiP)2 by Materials Project

TbNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tb3+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Tb–P bond lengths are 2.98 Å. Ni+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.28 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Tb3+, four equivalent Ni+1.50+, and one P3- atom. The P–P bond length is 2.32 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(NiP)2 by Materials Project

YNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y3+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Y–P bond lengths are 2.98 Å. Ni+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.28 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Y3+, four equivalent Ni+1.50+, and one P3- atom. The P–P bond length is 2.32 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(NiP)2 by Materials Project

CeNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce3+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Ce–P bond lengths are 3.03 Å. Ni+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.30 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Ce3+, four equivalent Ni+1.50+, and one P3- atom. The P–P bond length is 2.38 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(NiP)2 by Materials Project

PrNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Pr–P bond lengths are 3.07 Å. Ni+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.30 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Ni+1.50+, and one P3- atom. The P–P bond length is 2.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd(NiP)2 by Materials Project

NdNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Nd3+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Nd–P bond lengths are 3.04 Å. Ni+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.29 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Nd3+, four equivalent Ni+1.50+, and one P3- atom. The P–P bond length is 2.43 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(NiP)2 by Materials Project

YbNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb2+ is bonded to eight equivalent P3- atoms to form YbP8 hexagonal bipyramids that share corners with sixteen equivalent NiP4 tetrahedra, edges with four equivalent YbP8 hexagonal bipyramids, edges with eight equivalent NiP4 tetrahedra, and faces with four equivalent YbP8 hexagonal bipyramids. All Yb–P bond lengths are 2.97 Å. Ni2+ is bonded to four equivalent P3- atoms to form NiP4 tetrahedra that share corners with eight equivalent YbP8 hexagonal bipyramids, corners with four equivalent NiP4 tetrahedra, edges with four equivalent YbP8 hexagonal bipyramids, and edges with four equivalent NiP4 tetrahedra. All Ni–P bond lengths are 2.27 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Yb2+, four equivalent Ni2+, and one P3- atom. The P–P bond length is 2.26 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(NiP)2 by Materials Project

SmNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm2+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Sm–P bond lengths are 3.02 Å. Ni2+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.29 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Sm2+, four equivalent Ni2+, and one P3- atom. The P–P bond length is 2.38 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La(NiP)2 by Materials Project

LaNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. La3+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All La–P bond lengths are 3.09 Å. Ni+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.31 Å. P3- is bonded in a 9-coordinate geometry to four equivalent La3+, four equivalent Ni+1.50+, and one P3- atom. The P–P bond length is 2.51 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(NiP)2 by Materials Project

BaNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba2+ is bonded in a body-centered cubic geometry to eight equivalent P3- atoms. All Ba–P bond lengths are 3.37 Å. Ni2+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.25 Å. P3- is bonded in a 4-coordinate geometry to four equivalent Ba2+ and four equivalent Ni2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiP(H4O3)3 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2024

Phase control of spin waves in the van der Waals antiferromagnet NiPS 3

Here we demonstrate phase control of magnons in the van der Waals antiferromagnet NiPS3 using optical excitation by polarized light. The sign of the coherent precession of spin amplitude changes upon (i) reversing the helicity of a circularly polarized pump beam, or (ii) rotating the polarization of a linearly polarized pump by π/2. Because these two excitation pathways have comparable generation efficiency, the phase of spin precession can be continuously tuned from 0 to 2π by controlling the polarization state of the pump pulse. The ability to excite magnons with a desired phase has potential applications in the design of a spin-wave phased array and ultrafast spin information processing.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
NASA NTRS1980

Radiation damage in silicon NIP solar cells

The performance parameters of n(+) p p(+) silicon solar cells of varying thicknesses with boron doped p base resistivities of 1250 and 84 ohm centimeters were determined. High injection theory was used to analyze the experimental data. Results from an analysis of open circuit voltages show a much greater contribution to V(oc) from the back junction than is the case for the lower resistivity in common use. The base minority carrier distribution is seen to be significant in determining the contribution of V(B), the base contribution to V(oc). Although V(B) is small, its value increases with increasing radiation fluence. In this connection it is noted that, with illumination from the p(+) side, the sign of V(B) becomes positive, and V(B) itself becomes an additive term to V(oc). Diffusion lengths determined under high injection conditions are significantly greater than those obtained under low injection, while damage coefficients under low injection are higher than those obtained under high injection conditions.

Weinberg, I.↗
NASA NTRS1985

Railroad safety program, volume 1

Since 1981, the Federal Railroad Administration (FRA) has annually prepared a National Inspection Plan (NIP) whose purpose is to summarize regional efforts to improve railroad transportation safety. The research concluded on the following tasks including the problems, conclusions and recommendations associated with these tasks is summarized: (1) the preparation of the 1983 NIP, with recommended procedures for improving future NIPs; (2) the development of an outline for the 1984 NIP, including a methodology for the allocation of inspection resources and other specialized regional activities; (3) the management and development of the 1984 NIP; and (4) the development of an instruction manual to be used in the preparation of future NIPs.

Source record↗