Ba8Ho3(Pt2O9)2 crystallizes in the cubic Pm-3m space group. Ba(1) is bonded in a distorted q6 geometry to three equivalent O(2) and six equivalent O(1) atoms. Ho(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form HoO6 octahedra that share corners with two equivalent Pt(1)O6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to six equivalent O(2) atoms to form PtO6 octahedra that share corners with six equivalent Ho(1)O6 octahedra. The corner-sharing octahedra are not tilted. In the second Pt site, Pt(2) is bonded in a square co-planar geometry to four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Ho(1), and one Pt(2) atom to form a mixture of distorted edge, corner, and face-sharing OBa4HoPt octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second O site, O(2) is bonded to four equivalent Ba(1), one Ho(1), and one Pt(1) atom to form a mixture of distorted edge, corner, and face-sharing OBa4HoPt octahedra. The corner-sharing octahedral tilt angles range from 0-55°.
Ba8Ho3(Pt2O9)2 crystallizes in the cubic Pm-3m space group. Ba(1) is bonded in a distorted q6 geometry to three equivalent O(2) and six equivalent O(1) atoms. All Ba(1)-O(2) bond lengths are 2.84 Å. All Ba(1)-O(1) bond lengths are 3.01 Å. Ho(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form HoO6 octahedra that share corners with two equivalent Pt(1)O6 octahedra. The corner-sharing octahedra are not tilted. Both Ho(1)-O(2) bond lengths are 2.21 Å. All Ho(1)-O(1) bond lengths are 2.21 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to six equivalent O(2) atoms to form PtO6 octahedra that share corners with six equivalent Ho(1)O6 octahedra. The corner-sharing octahedra are not tilted. All Pt(1)-O(2) bond lengths are 2.03 Å. In the second Pt site, Pt(2) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Pt(2)-O(1) bond lengths are 2.03 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1), one Ho(1), and one Pt(2) atom to form a mixture of distorted edge, corner, and face-sharing OBa4HoPt octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second O site, O(2) is bonded to four equivalent Ba(1), one Ho(1), and one Pt(1) atom to form a mixture of distorted edge, corner, and face-sharing OBa4HoPt octahedra. The corner-sharing octahedral tilt angles range from 0-55°.