Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Np”

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.

At least 703 records · Page 39
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NpSe3 by Materials Project

NpSe3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np6+ is bonded to twelve Se2- atoms to form NpSe12 cuboctahedra that share corners with four equivalent NpSe12 cuboctahedra, edges with eight equivalent NpSe12 cuboctahedra, edges with sixteen equivalent SeNp4Se8 cuboctahedra, faces with four equivalent NpSe12 cuboctahedra, and faces with eight equivalent SeNp4Se8 cuboctahedra. There are four shorter (2.91 Å) and eight longer (3.21 Å) Np–Se bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to four equivalent Np6+ and eight Se2- atoms to form distorted SeNp4Se8 cuboctahedra that share corners with twelve equivalent SeNp4Se8 cuboctahedra, edges with eight equivalent NpSe12 cuboctahedra, edges with eight equivalent SeNp4Se8 cuboctahedra, faces with four equivalent NpSe12 cuboctahedra, and faces with ten equivalent SeNp4Se8 cuboctahedra. There are four shorter (2.91 Å) and four longer (3.21 Å) Se–Se bond lengths. In the second Se2- site, Se2- is bonded in a square co-planar geometry to four equivalent Np6+ and eight equivalent Se2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuNpO3 by Materials Project

EuNpO3 is Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Np3+ is bonded to six O2- atoms to form corner-sharing NpO6 octahedra. The corner-sharing octahedra tilt angles range from 36–39°. There are four shorter (2.26 Å) and two longer (2.27 Å) Np–O bond lengths. Eu3+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Eu–O bond distances ranging from 2.45–2.86 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Np3+ and two equivalent Eu3+ atoms. In the second O2- site, O2- is bonded to two equivalent Np3+ and two equivalent Eu3+ atoms to form distorted corner-sharing OEu2Np2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaNpO4 by Materials Project

BaNpO4 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.73–3.40 Å. Np6+ is bonded to six O2- atoms to form corner-sharing NpO6 octahedra. The corner-sharing octahedra tilt angles range from 39–45°. There are a spread of Np–O bond distances ranging from 1.91–2.21 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ba2+ and two equivalent Np6+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Ba2+ and one Np6+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+ and two equivalent Np6+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaNp(HO2)2 by Materials Project

NaNp(HO2)2 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. Na1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.33–2.78 Å. Np5+ is bonded to seven O2- atoms to form a mixture of distorted edge and corner-sharing NpO7 pentagonal bipyramids. There are a spread of Np–O bond distances ranging from 1.91–2.48 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Na1+ and one Np5+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one Na1+, two equivalent Np5+, and one H1+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+ and two equivalent Np5+ atoms. In the fourth O2- site, O2- is bonded in a single-bond geometry to one Na1+, two equivalent Np5+, and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpCrH8C2(NO2)4 by Materials Project

NpCrC2H8(NO2)4 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of two NpCrC2H8(NO2)4 ribbons oriented in the (1, 0, 0) direction. Np6+ is bonded to seven O2- atoms to form distorted NpO7 pentagonal bipyramids that share corners with three equivalent CrO4 tetrahedra. There are a spread of Np–O bond distances ranging from 1.80–2.43 Å. Cr6+ is bonded to four O2- atoms to form CrO4 tetrahedra that share corners with three equivalent NpO7 pentagonal bipyramids. There are a spread of Cr–O bond distances ranging from 1.61–1.70 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to two N3- and one O2- atom. There is one shorter (1.34 Å) and one longer (1.35 Å) C–N bond length. The C–O bond length is 1.28 Å. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to two N3- and one O2- atom. There is one shorter (1.34 Å) and one longer (1.35 Å) C–N bond length. The C–O bond length is 1.28 Å. There are four inequivalent N3- sites. In the first N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.01 Å. In the second N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.01 Å. In the third N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.01 Å. In the fourth N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.02 Å. There are eight inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Np6+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one Np6+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one Cr6+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Np6+ and one Cr6+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Np6+ and one Cr6+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Np6+ and one Cr6+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to one Np6+ and one C4+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one Np6+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na5NpO6 by Materials Project

Na5NpO6 is Caswellsilverite-like structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with six NaO6 octahedra, edges with three equivalent NpO6 octahedra, and edges with nine NaO6 octahedra. The corner-sharing octahedra tilt angles range from 15–18°. There are four shorter (2.41 Å) and two longer (2.45 Å) Na–O bond lengths. In the second Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with two equivalent NpO6 octahedra, corners with four equivalent NaO6 octahedra, edges with two equivalent NpO6 octahedra, and edges with ten NaO6 octahedra. The corner-sharing octahedra tilt angles range from 0–15°. There are four shorter (2.37 Å) and two longer (2.79 Å) Na–O bond lengths. In the third Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with two equivalent NpO6 octahedra, corners with four equivalent NaO6 octahedra, edges with two equivalent NpO6 octahedra, and edges with ten NaO6 octahedra. The corner-sharing octahedra tilt angles range from 1–18°. There are a spread of Na–O bond distances ranging from 2.40–2.65 Å. Np7+ is bonded to six O2- atoms to form NpO6 octahedra that share corners with six NaO6 octahedra and edges with twelve NaO6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are two shorter (2.02 Å) and four longer (2.06 Å) Np–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to five Na1+ and one Np7+ atom to form a mixture of distorted corner and edge-sharing ONa5Np octahedra. The corner-sharing octahedra tilt angles range from 0–13°. In the second O2- site, O2- is bonded in a 6-coordinate geometry to five Na1+ and one Np7+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Np2Se5 by Materials Project

Np2Se5 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. Np5+ is bonded in a 10-coordinate geometry to ten Se2- atoms. There are a spread of Np–Se bond distances ranging from 2.93–3.08 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 4-coordinate geometry to four equivalent Np5+ and two equivalent Se2- atoms. There are one shorter (2.67 Å) and one longer (2.79 Å) Se–Se bond lengths. In the second Se2- site, Se2- is bonded to four equivalent Np5+ atoms to form distorted corner-sharing SeNp4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Np2S5 by Materials Project

Np2S5 crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. Np5+ is bonded in a 10-coordinate geometry to ten S2- atoms. There are a spread of Np–S bond distances ranging from 2.77–2.96 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a 6-coordinate geometry to four equivalent Np5+ and one S2- atom. The S–S bond length is 2.23 Å. In the second S2- site, S2- is bonded in a 4-coordinate geometry to four equivalent Np5+ atoms. In the third S2- site, S2- is bonded to four equivalent Np5+ atoms to form distorted corner-sharing SNp4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpB12 by Materials Project

NpB12 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Np6+ is bonded in a 1-coordinate geometry to twenty-four equivalent B+0.50- atoms. All Np–B bond lengths are 2.76 Å. B+0.50- is bonded in a 7-coordinate geometry to two equivalent Np6+ and five equivalent B+0.50- atoms. There is one shorter (1.69 Å) and four longer (1.78 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpAlO3 by Materials Project

NpAlO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Np3+ is bonded to twelve equivalent O2- atoms to form NpO12 cuboctahedra that share corners with twelve equivalent NpO12 cuboctahedra, faces with six equivalent NpO12 cuboctahedra, and faces with eight equivalent AlO6 octahedra. All Np–O bond lengths are 2.66 Å. Al3+ is bonded to six equivalent O2- atoms to form AlO6 octahedra that share corners with six equivalent AlO6 octahedra and faces with eight equivalent NpO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Al–O bond lengths are 1.88 Å. O2- is bonded in a distorted linear geometry to four equivalent Np3+ and two equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KNp2F9 by Materials Project

KNp2F9 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to ten F1- atoms. There are a spread of K–F bond distances ranging from 2.65–3.21 Å. Np4+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Np–F bond distances ranging from 2.26–2.44 Å. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a linear geometry to two equivalent Np4+ atoms. In the second F1- site, F1- is bonded in a 3-coordinate geometry to two equivalent K1+ and two equivalent Np4+ atoms. In the third F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Np4+ atoms. In the fourth F1- site, F1- is bonded in a distorted trigonal planar geometry to one K1+ and two equivalent Np4+ atoms. In the fifth F1- site, F1- is bonded in a trigonal planar geometry to one K1+ and two equivalent Np4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaNp(PO4)2 by Materials Project

BaNp(PO4)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ba2+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Ba–O bond distances ranging from 2.77–3.30 Å. Np4+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Np–O bond distances ranging from 2.31–2.49 Å. P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ba2+, one Np4+, and one P5+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Ba2+, one Np4+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+, one Np4+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ba2+, one Np4+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpSnO3 by Materials Project

NpSnO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Np4+ is bonded to twelve equivalent O2- atoms to form NpO12 cuboctahedra that share corners with twelve equivalent NpO12 cuboctahedra, faces with six equivalent NpO12 cuboctahedra, and faces with eight equivalent SnO6 octahedra. All Np–O bond lengths are 2.94 Å. Sn2+ is bonded to six equivalent O2- atoms to form SnO6 octahedra that share corners with six equivalent SnO6 octahedra and faces with eight equivalent NpO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Sn–O bond lengths are 2.08 Å. O2- is bonded in a linear geometry to four equivalent Np4+ and two equivalent Sn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpSe3 by Materials Project

NpSe3 crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one NpSe3 sheet oriented in the (0, 0, 1) direction. Np6+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of Np–Se bond distances ranging from 2.88–2.96 Å. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 2-coordinate geometry to two equivalent Np6+ and one Se2- atom. The Se–Se bond length is 2.37 Å. In the second Se2- site, Se2- is bonded to four equivalent Np6+ atoms to form a mixture of distorted corner and edge-sharing SeNp4 trigonal pyramids. In the third Se2- site, Se2- is bonded in a 2-coordinate geometry to two equivalent Np6+ and one Se2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpTl2F6 by Materials Project

NpTl2F6 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Np4+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Np–F bond distances ranging from 2.20–2.47 Å. Tl1+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Tl–F bond distances ranging from 2.91–3.15 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a 1-coordinate geometry to one Np4+ and four equivalent Tl1+ atoms. In the second F1- site, F1- is bonded in a 2-coordinate geometry to two equivalent Np4+ and one Tl1+ atom. In the third F1- site, F1- is bonded in a distorted single-bond geometry to one Np4+ and four equivalent Tl1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpTaO3 by Materials Project

NpTaO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Np3+ is bonded to twelve equivalent O2- atoms to form NpO12 cuboctahedra that share corners with twelve equivalent NpO12 cuboctahedra, faces with six equivalent NpO12 cuboctahedra, and faces with eight equivalent TaO6 octahedra. All Np–O bond lengths are 2.86 Å. Ta3+ is bonded to six equivalent O2- atoms to form TaO6 octahedra that share corners with six equivalent TaO6 octahedra and faces with eight equivalent NpO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Ta–O bond lengths are 2.02 Å. O2- is bonded in a distorted linear geometry to four equivalent Np3+ and two equivalent Ta3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpN4O11 by Materials Project

(NpN3O11)2N2 is Tetraauricupride structured and crystallizes in the trigonal R-3c space group. The structure is zero-dimensional and consists of six ammonia molecules and six NpN3O11 clusters. In each NpN3O11 cluster, Np4+ is bonded in a distorted linear geometry to eight O2- atoms. There are two shorter (1.76 Å) and six longer (2.42 Å) Np–O bond lengths. N+4.50+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.21 Å) and two longer (1.30 Å) N–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one N+4.50+ atom. In the second O2- site, O2- is bonded in a distorted water-like geometry to one Np4+ and one N+4.50+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one Np4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsNpMoO6 by Materials Project

CsNpMoO6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Cs1+ is bonded in a 2-coordinate geometry to nine O2- atoms. There are a spread of Cs–O bond distances ranging from 3.08–3.65 Å. Np5+ is bonded to seven O2- atoms to form distorted NpO7 pentagonal bipyramids that share corners with two equivalent NpO7 pentagonal bipyramids, corners with two equivalent MoO5 trigonal bipyramids, an edgeedge with one NpO7 pentagonal bipyramid, and edges with two equivalent MoO5 trigonal bipyramids. There are a spread of Np–O bond distances ranging from 1.82–2.43 Å. Mo6+ is bonded to five O2- atoms to form distorted MoO5 trigonal bipyramids that share corners with two equivalent NpO7 pentagonal bipyramids, edges with two equivalent NpO7 pentagonal bipyramids, and an edgeedge with one MoO5 trigonal bipyramid. There are a spread of Mo–O bond distances ranging from 1.75–2.05 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Np5+ and one Mo6+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Cs1+, one Np5+, and two equivalent Mo6+ atoms. In the third O2- site, O2- is bonded in a single-bond geometry to three equivalent Cs1+ and one Np5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Cs1+ and one Np5+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Cs1+ and one Mo6+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Np5+ and one Mo6+ atom.

36 MATERIALS SCIENCE↗