Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “As-K-O-U”

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.

4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on K2UAs2O9 by Materials Project

K2UAs2O9 crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.79–3.29 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.94–3.23 Å. U6+ is bonded to six O2- atoms to form UO6 octahedra that share corners with four AsO4 tetrahedra. There are a spread of U–O bond distances ranging from 1.82–2.31 Å. There are two inequivalent As5+ sites. In the first As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with two equivalent UO6 octahedra and a cornercorner with one AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of As–O bond distances ranging from 1.66–1.81 Å. In the second As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with two equivalent UO6 octahedra and a cornercorner with one AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. There are a spread of As–O bond distances ranging from 1.67–1.82 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+ and two equivalent As5+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one K1+ and one U6+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one U6+, and one As5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one U6+, and one As5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+ and two equivalent As5+ atoms. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one As5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K4U3(AsO8)2 by Materials Project

K4U3(AsO8)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.65–3.22 Å. In the second K1+ site, K1+ is bonded in a 3-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.71–3.44 Å. There are two inequivalent U6+ sites. In the first U6+ site, U6+ is bonded to seven O2- atoms to form distorted UO7 pentagonal bipyramids that share corners with three equivalent AsO4 tetrahedra and an edgeedge with one UO7 pentagonal bipyramid. There are a spread of U–O bond distances ranging from 1.86–2.41 Å. In the second U6+ site, U6+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of U–O bond distances ranging from 1.85–2.64 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with three equivalent UO7 pentagonal bipyramids. There are a spread of As–O bond distances ranging from 1.69–1.75 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one U6+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three K1+ and one U6+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one K1+ and three U6+ atoms. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one U6+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three K1+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one K1+, one U6+, and one As5+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two U6+, and one As5+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two U6+, and one As5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K6U5As2O23 by Materials Project

K6U5As2O23 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to six O2- atoms to form distorted KO6 octahedra that share a cornercorner with one UO6 octahedra, corners with four UO7 pentagonal bipyramids, and a cornercorner with one AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. There are a spread of K–O bond distances ranging from 2.61–2.84 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.73–2.94 Å. In the third K1+ site, K1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of K–O bond distances ranging from 2.77–2.94 Å. There are three inequivalent U6+ sites. In the first U6+ site, U6+ is bonded to seven O2- atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent KO6 octahedra, corners with two equivalent UO6 octahedra, a cornercorner with one UO7 pentagonal bipyramid, edges with two equivalent UO7 pentagonal bipyramids, and an edgeedge with one AsO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–62°. There are a spread of U–O bond distances ranging from 1.88–2.52 Å. In the second U6+ site, U6+ is bonded to seven O2- atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent KO6 octahedra, corners with three equivalent AsO4 tetrahedra, an edgeedge with one UO6 octahedra, and edges with two equivalent UO7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 55–56°. There are a spread of U–O bond distances ranging from 1.85–2.42 Å. In the third U6+ site, U6+ is bonded to six O2- atoms to form UO6 octahedra that share corners with two equivalent KO6 octahedra, corners with four equivalent UO7 pentagonal bipyramids, and edges with two equivalent UO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 61°. There are a spread of U–O bond distances ranging from 1.88–2.28 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share a cornercorner with one KO6 octahedra, corners with three equivalent UO7 pentagonal bipyramids, and an edgeedge with one UO7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 79°. There are a spread of As–O bond distances ranging from 1.68–1.75 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two K1+ and one U6+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two U6+ and one As5+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three K1+ and one U6+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two U6+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one U6+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to three K1+ and one U6+ atom. In the seventh O2- site, O2- is bonded in a linear geometry to two equivalent U6+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to three U6+ atoms. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to three U6+ atoms. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to three K1+ and one As5+ atom. In the eleventh O2- site, O2- is bonded in a 3-coordinate geometry to two K1+ and one U6+ atom. In the twelfth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one As5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KU3AsO15 by Materials Project

KU3AsO15 crystallizes in the orthorhombic Cccm space group. The structure is three-dimensional. K is bonded to eight O atoms to form distorted KO8 octahedra that share corners with two equivalent KO8 octahedra and corners with four equivalent UO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 0°. There are a spread of K–O bond distances ranging from 2.72–3.35 Å. There are two inequivalent U sites. In the first U site, U is bonded to seven O atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent KO8 octahedra, corners with two equivalent AsO4 tetrahedra, and an edgeedge with one UO7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 54°. There are a spread of U–O bond distances ranging from 1.87–2.44 Å. In the second U site, U is bonded in a distorted linear geometry to eight O atoms. There are a spread of U–O bond distances ranging from 1.80–2.53 Å. As is bonded to four equivalent O atoms to form AsO4 tetrahedra that share corners with four equivalent UO7 pentagonal bipyramids. All As–O bond lengths are 1.72 Å. There are six inequivalent O sites. In the first O site, O is bonded in a linear geometry to two equivalent K atoms. In the second O site, O is bonded in a 1-coordinate geometry to two U and one As atom. In the third O site, O is bonded in a distorted single-bond geometry to one K and one U atom. In the fourth O site, O is bonded in a single-bond geometry to one U atom. In the fifth O site, O is bonded in a trigonal planar geometry to three U atoms. In the sixth O site, O is bonded in a distorted bent 120 degrees geometry to one K and one U atom.

36 MATERIALS SCIENCE↗