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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.

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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NpAs2 by Materials Project

NpAs2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Np6+ is bonded in a 9-coordinate geometry to nine As3- atoms. There are a spread of Np–As bond distances ranging from 2.86–3.05 Å. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded to five equivalent Np6+ atoms to form a mixture of corner and edge-sharing AsNp5 square pyramids. In the second As3- site, As3- is bonded in a 8-coordinate geometry to four equivalent Np6+ and four equivalent As3- atoms. All As–As bond lengths are 2.80 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpAs by Materials Project

NpAs is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Np3+ is bonded in a body-centered cubic geometry to eight equivalent As3- atoms. All Np–As bond lengths are 3.03 Å. As3- is bonded in a body-centered cubic geometry to eight equivalent Np3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpAs by Materials Project

NpAs is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Np3+ is bonded to six equivalent As3- atoms to form a mixture of edge and corner-sharing NpAs6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Np–As bond lengths are 2.91 Å. As3- is bonded to six equivalent Np3+ atoms to form a mixture of edge and corner-sharing AsNp6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Np3As4 by Materials Project

Np3As4 crystallizes in the cubic I-43d space group. The structure is three-dimensional. Np4+ is bonded to eight equivalent As3- atoms to form a mixture of distorted edge, corner, and face-sharing NpAs8 hexagonal bipyramids. There are four shorter (2.91 Å) and four longer (2.97 Å) Np–As bond lengths. As3- is bonded to six equivalent Np4+ atoms to form a mixture of distorted edge, corner, and face-sharing AsNp6 octahedra. The corner-sharing octahedra tilt angles range from 15–51°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpAs3 by Materials Project

NpAs3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np3+ is bonded to twelve As1- atoms to form a mixture of edge, face, and corner-sharing NpAs12 cuboctahedra. There are four shorter (2.86 Å) and eight longer (3.16 Å) Np–As bond lengths. There are two inequivalent As1- sites. In the first As1- site, As1- is bonded in a 8-coordinate geometry to four equivalent Np3+ and four equivalent As1- atoms. All As–As bond lengths are 2.86 Å. In the second As1- site, As1- is bonded in a square co-planar geometry to four equivalent Np3+ atoms.

36 MATERIALS SCIENCE↗