Materials Data on Tb2Y2O5 by Materials Project
Tb2Y2O5 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Tb is bonded in a 5-coordinate geometry to five O atoms. There are four shorter (2.17 Å) and one longer (2.60 Å) Tb–O bond lengths. There are two inequivalent Y sites. In the first Y site, Y is bonded in a body-centered cubic geometry to eight equivalent O atoms. All Y–O bond lengths are 2.40 Å. In the second Y site, Y is bonded in a square co-planar geometry to four equivalent O atoms. All Y–O bond lengths are 2.76 Å. There are two inequivalent O sites. In the first O site, O is bonded to two equivalent Tb and two equivalent Y atoms to form OTb2Y2 tetrahedra that share corners with two equivalent OTb2Y4 octahedra, corners with ten equivalent OTb2Y2 tetrahedra, and edges with five equivalent OTb2Y2 tetrahedra. The corner-sharing octahedral tilt angles are 64°. In the second O site, O is bonded to two equivalent Tb and four equivalent Y atoms to form OTb2Y4 octahedra that share corners with four equivalent OTb2Y4 octahedra, corners with eight equivalent OTb2Y2 tetrahedra, and edges with four equivalent OTb2Y4 octahedra. The corner-sharing octahedral tilt angles are 0°.