Materials Data on Ce3UO8 by Materials Project

Abstract

UCe3O8 is alpha bismuth trifluoride-derived structured and 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 (2.15 Å) and six longer (2.33 Å) U–O bond lengths. There are two inequivalent Ce+3.33+ sites. In the first Ce+3.33+ site, Ce+3.33+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Ce–O bond distances ranging from 2.32–2.48 Å. In the second Ce+3.33+ site, Ce+3.33+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are six shorter (2.38 Å) and two longer (2.44 Å) Ce–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to four Ce+3.33+ atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra. In the second O2- site, O2- is bonded to one U6+ and three equivalent Ce+3.33+ atoms to form OCe3U tetrahedra that share corners with sixteen OCe4 tetrahedra and edges with six OCeU3 tetrahedra. In the third O2- site, O2- is bonded to three equivalent U6+ and one Ce+3.33+ atom to form OCeU3 tetrahedra that share corners with sixteen OCe4 tetrahedra and edges with six OCe3U tetrahedra. In the fourth O2- site, O2- is bonded to four Ce+3.33+ atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra.