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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on UAsSe by Materials Project

UAsSe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. U5+ is bonded in a 9-coordinate geometry to four equivalent As3- and five equivalent Se2- atoms. All U–As bond lengths are 3.03 Å. There are four shorter (2.92 Å) and one longer (3.04 Å) U–Se bond lengths. As3- is bonded in a 8-coordinate geometry to four equivalent U5+ and four equivalent As3- atoms. All As–As bond lengths are 2.81 Å. Se2- is bonded to five equivalent U5+ atoms to form a mixture of distorted edge and corner-sharing SeU5 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U2AsSe by Materials Project

U2AsSe is Caswellsilverite-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent U sites. In the first U site, U is bonded to three As and three Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. There are one shorter (2.88 Å) and two longer (2.89 Å) U–As bond lengths. There are two shorter (2.89 Å) and one longer (2.90 Å) U–Se bond lengths. In the second U site, U is bonded to three As and three Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedra tilt angles range from 0–2°. There are two shorter (2.88 Å) and one longer (2.89 Å) U–As bond lengths. There are two shorter (2.89 Å) and one longer (2.90 Å) U–Se bond lengths. In the third U site, U is bonded to three As and three Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. There are one shorter (2.88 Å) and two longer (2.89 Å) U–As bond lengths. There are two shorter (2.89 Å) and one longer (2.91 Å) U–Se bond lengths. In the fourth U site, U is bonded to three As and three Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. There are one shorter (2.88 Å) and two longer (2.89 Å) U–As bond lengths. There are two shorter (2.89 Å) and one longer (2.90 Å) U–Se bond lengths. There are two inequivalent As sites. In the first As site, As is bonded to six U atoms to form AsU6 octahedra that share corners with two equivalent SeU6 octahedra, corners with four equivalent AsU6 octahedra, edges with four equivalent AsU6 octahedra, and edges with eight SeU6 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. In the second As site, As is bonded to six U atoms to form AsU6 octahedra that share corners with two equivalent SeU6 octahedra, corners with four equivalent AsU6 octahedra, edges with four equivalent AsU6 octahedra, and edges with eight SeU6 octahedra. The corner-sharing octahedra tilt angles range from 0–2°. There are two inequivalent Se sites. In the first Se site, Se is bonded to six U atoms to form SeU6 octahedra that share corners with two equivalent AsU6 octahedra, corners with four equivalent SeU6 octahedra, edges with four equivalent SeU6 octahedra, and edges with eight AsU6 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. In the second Se site, Se is bonded to six U atoms to form SeU6 octahedra that share corners with two equivalent AsU6 octahedra, corners with four equivalent SeU6 octahedra, edges with four equivalent SeU6 octahedra, and edges with eight AsU6 octahedra. The corner-sharing octahedra tilt angles range from 0–2°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U2AsSe by Materials Project

U2AsSe is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are two inequivalent U sites. In the first U site, U is bonded to two equivalent As and four equivalent Se atoms to form a mixture of corner and edge-sharing UAs2Se4 octahedra. The corner-sharing octahedral tilt angles are 0°. Both U–As bond lengths are 2.88 Å. All U–Se bond lengths are 2.88 Å. In the second U site, U is bonded to four equivalent As and two equivalent Se atoms to form UAs4Se2 octahedra that share corners with six equivalent UAs4Se2 octahedra and edges with twelve UAs2Se4 octahedra. The corner-sharing octahedral tilt angles are 0°. All U–As bond lengths are 2.88 Å. Both U–Se bond lengths are 2.88 Å. As is bonded to six U atoms to form AsU6 octahedra that share corners with six equivalent AsU6 octahedra, edges with four equivalent AsU6 octahedra, and edges with eight equivalent SeU6 octahedra. The corner-sharing octahedral tilt angles are 0°. Se is bonded to six U atoms to form SeU6 octahedra that share corners with six equivalent SeU6 octahedra, edges with four equivalent SeU6 octahedra, and edges with eight equivalent AsU6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U2AsSe by Materials Project

U2AsSe is Heusler-like structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. U is bonded in a body-centered cubic geometry to four equivalent As and four equivalent Se atoms. All U–As bond lengths are 3.03 Å. All U–Se bond lengths are 3.09 Å. As is bonded in a body-centered cubic geometry to eight equivalent U atoms. Se is bonded in a body-centered cubic geometry to eight equivalent U atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U2AsSe by Materials Project

U2AsSe is Caswellsilverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. there are six inequivalent U sites. In the first U site, U is bonded to three equivalent As and three equivalent Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are one shorter (2.87 Å) and two longer (2.89 Å) U–As bond lengths. There are one shorter (2.88 Å) and two longer (2.89 Å) U–Se bond lengths. In the second U site, U is bonded to three equivalent As and three equivalent Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are one shorter (2.87 Å) and two longer (2.89 Å) U–As bond lengths. There are one shorter (2.88 Å) and two longer (2.89 Å) U–Se bond lengths. In the third U site, U is bonded to three equivalent As and three equivalent Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are one shorter (2.87 Å) and two longer (2.89 Å) U–As bond lengths. There are one shorter (2.88 Å) and two longer (2.89 Å) U–Se bond lengths. In the fourth U site, U is bonded to three equivalent As and three equivalent Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are one shorter (2.87 Å) and two longer (2.89 Å) U–As bond lengths. There are one shorter (2.88 Å) and two longer (2.89 Å) U–Se bond lengths. In the fifth U site, U is bonded to three equivalent As and three equivalent Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are one shorter (2.87 Å) and two longer (2.89 Å) U–As bond lengths. There are one shorter (2.88 Å) and two longer (2.89 Å) U–Se bond lengths. In the sixth U site, U is bonded to three equivalent As and three equivalent Se atoms to form a mixture of edge and corner-sharing UAs3Se3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are one shorter (2.87 Å) and two longer (2.89 Å) U–As bond lengths. There are one shorter (2.88 Å) and two longer (2.89 Å) U–Se bond lengths. As is bonded to six U atoms to form AsU6 octahedra that share corners with two equivalent SeU6 octahedra, corners with four equivalent AsU6 octahedra, edges with four equivalent AsU6 octahedra, and edges with eight equivalent SeU6 octahedra. The corner-sharing octahedral tilt angles are 0°. Se is bonded to six U atoms to form SeU6 octahedra that share corners with two equivalent AsU6 octahedra, corners with four equivalent SeU6 octahedra, edges with four equivalent SeU6 octahedra, and edges with eight equivalent AsU6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U3As2Se by Materials Project

U3As2Se is Heusler-like structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent U sites. In the first U site, U is bonded in a body-centered cubic geometry to six equivalent As and two equivalent Se atoms. All U–As bond lengths are 3.05 Å. Both U–Se bond lengths are 3.06 Å. In the second U site, U is bonded in a body-centered cubic geometry to five equivalent As and three equivalent Se atoms. There are a spread of U–As bond distances ranging from 3.03–3.06 Å. All U–Se bond lengths are 3.05 Å. As is bonded in a body-centered cubic geometry to eight U atoms. Se is bonded in a body-centered cubic geometry to eight U atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U2As3Se by Materials Project

U2As3Se crystallizes in the tetragonal P4mm space group. The structure is three-dimensional. there are two inequivalent U+5.50+ sites. In the first U+5.50+ site, U+5.50+ is bonded in a 9-coordinate geometry to five As3- and four equivalent Se2- atoms. There are one shorter (2.95 Å) and four longer (3.04 Å) U–As bond lengths. All U–Se bond lengths are 2.89 Å. In the second U+5.50+ site, U+5.50+ is bonded in a 9-coordinate geometry to eight As3- and one Se2- atom. There are four shorter (2.89 Å) and four longer (3.02 Å) U–As bond lengths. The U–Se bond length is 2.94 Å. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded in a 8-coordinate geometry to four U+5.50+ and four equivalent As3- atoms. All As–As bond lengths are 2.81 Å. In the second As3- site, As3- is bonded to five U+5.50+ atoms to form distorted AsU5 trigonal bipyramids that share corners with four equivalent AsU5 trigonal bipyramids, edges with four equivalent AsU5 trigonal bipyramids, and edges with four equivalent SeU5 trigonal bipyramids. Se2- is bonded to five U+5.50+ atoms to form distorted SeU5 trigonal bipyramids that share corners with four equivalent SeU5 trigonal bipyramids, edges with four equivalent AsU5 trigonal bipyramids, and edges with four equivalent SeU5 trigonal bipyramids.

36 MATERIALS SCIENCE↗