Sr5(AuO4)2 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted body-centered cubic geometry to eight equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. Au(1) is bonded in a rectangular see-saw-like geometry to four equivalent O(1) atoms. O(1) is bonded to one Sr(2), four equivalent Sr(1), and one Au(1) atom to form a mixture of distorted face, corner, and edge-sharing OSr5Au octahedra. The corner-sharing octahedral tilt angles range from 0-72°.
Sr5(AuO4)2 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted body-centered cubic geometry to eight equivalent O(1) atoms. There are four shorter (2.54 Å) and four longer (2.79 Å) Sr(1)-O(1) bond lengths. In the second Sr site, Sr(2) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Sr(2)-O(1) bond lengths are 2.64 Å. Au(1) is bonded in a rectangular see-saw-like geometry to four equivalent O(1) atoms. All Au(1)-O(1) bond lengths are 2.03 Å. O(1) is bonded to one Sr(2), four equivalent Sr(1), and one Au(1) atom to form a mixture of distorted face, corner, and edge-sharing OSr5Au octahedra. The corner-sharing octahedral tilt angles range from 0-72°.