Materials Data on Rb2U2O5 by Materials Project
Rb2U2O5 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a distorted body-centered cubic geometry to eight equivalent O2- atoms. All Rb–O bond lengths are 3.08 Å. In the second Rb1+ site, Rb1+ is bonded to twelve O2- atoms to form RbO12 cuboctahedra that share corners with four equivalent RbO12 cuboctahedra, faces with four equivalent RbO12 cuboctahedra, and faces with eight equivalent UO5 square pyramids. There are four shorter (3.09 Å) and eight longer (3.22 Å) Rb–O bond lengths. U4+ is bonded to five O2- atoms to form UO5 square pyramids that share corners with five equivalent UO5 square pyramids and faces with four equivalent RbO12 cuboctahedra. There are one shorter (2.17 Å) and four longer (2.19 Å) U–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to four Rb1+ and two equivalent U4+ atoms. In the second O2- site, O2- is bonded in a distorted linear geometry to four equivalent Rb1+ and two equivalent U4+ atoms.