LiSr2UYbO6 crystallizes in the orthorhombic Immm space group. Li(1) is bonded in a square co-planar geometry to two equivalent Sr(1) and four equivalent O(2) atoms. Sr(1) is bonded in a 9-coordinate geometry to one Li(1), four equivalent O(1), and four equivalent O(2) atoms. U(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form UO6 octahedra that share corners with six equivalent Yb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Yb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form YbO6 octahedra that share corners with six equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to four equivalent Sr(1), one U(1), and one Yb(1) atom. In the second O site, O(2) is bonded to one Li(1), two equivalent Sr(1), one U(1), and one Yb(1) atom to form a mixture of distorted edge, corner, and face-sharing OSr2LiYbU trigonal bipyramids.
LiSr2UYbO6 crystallizes in the orthorhombic Immm space group. Li(1) is bonded in a square co-planar geometry to two equivalent Sr(1) and four equivalent O(2) atoms. Both Li(1)-Sr(1) bond lengths are 2.86 Å. All Li(1)-O(2) bond lengths are 2.17 Å. Sr(1) is bonded in a 9-coordinate geometry to one Li(1), four equivalent O(1), and four equivalent O(2) atoms. All Sr(1)-O(1) bond lengths are 3.10 Å. All Sr(1)-O(2) bond lengths are 2.76 Å. U(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form UO6 octahedra that share corners with six equivalent Yb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Both U(1)-O(1) bond lengths are 2.19 Å. All U(1)-O(2) bond lengths are 2.12 Å. Yb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form YbO6 octahedra that share corners with six equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Both Yb(1)-O(1) bond lengths are 2.42 Å. All Yb(1)-O(2) bond lengths are 2.19 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to four equivalent Sr(1), one U(1), and one Yb(1) atom. In the second O site, O(2) is bonded to one Li(1), two equivalent Sr(1), one U(1), and one Yb(1) atom to form a mixture of distorted edge, corner, and face-sharing OSr2LiYbU trigonal bipyramids.