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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on UCdO4 by Materials Project

UCdO4 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. U6+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are two shorter (2.02 Å) and six longer (2.28 Å) U–O bond lengths. Cd2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are six shorter (2.44 Å) and two longer (2.52 Å) Cd–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one U6+ and three equivalent Cd2+ atoms to form a mixture of distorted edge and corner-sharing OUCd3 tetrahedra. In the second O2- site, O2- is bonded to three equivalent U6+ and one Cd2+ atom to form a mixture of distorted edge and corner-sharing OU3Cd tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UCdO4 by Materials Project

UCdO4 is Hydrophilite-derived structured and crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. U6+ is bonded to six O2- atoms to form UO6 octahedra that share corners with eight equivalent CdO6 octahedra and edges with two equivalent UO6 octahedra. The corner-sharing octahedra tilt angles range from 49–54°. There are two shorter (1.97 Å) and four longer (2.17 Å) U–O bond lengths. Cd2+ is bonded to six O2- atoms to form CdO6 octahedra that share corners with eight equivalent UO6 octahedra and edges with two equivalent CdO6 octahedra. The corner-sharing octahedra tilt angles range from 49–54°. There are four shorter (2.32 Å) and two longer (2.34 Å) Cd–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one U6+ and two equivalent Cd2+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to two equivalent U6+ and one Cd2+ atom.

36 MATERIALS SCIENCE↗