Materials Data on UTa2O8 by Materials Project
UTa2O8 crystallizes in the trigonal P-31m space group. The structure is three-dimensional. U6+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All U–O bond lengths are 2.12 Å. Ta5+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are two shorter (1.97 Å) and six longer (2.18 Å) Ta–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal non-coplanar geometry to one U6+ and two equivalent Ta5+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Ta5+ atoms.
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