HoTa5Ag2O15 crystallizes in the tetragonal P4/mbm space group. Ho(1) is bonded to four equivalent O(1) and eight equivalent O(4) atoms to form HoO12 cuboctahedra that share faces with two equivalent Ho(1)O12 cuboctahedra and faces with eight equivalent Ta(2)O6 octahedra. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-33°. In the second Ta site, Ta(2) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra, corners with five equivalent Ta(2)O6 octahedra, and faces with two equivalent Ho(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 13-43°. Ag(1) is bonded in an L-shaped geometry to two equivalent O(2) atoms. There are five inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the second O site, O(1) is bonded in a distorted T-shaped geometry to one Ho(1) and two equivalent Ta(2) atoms. In the third O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ta(2) and two equivalent Ag(1) atoms. In the fourth O site, O(3) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the fifth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ta(2) atoms.
HoTa5Ag2O15 crystallizes in the tetragonal P4/mbm space group. Ho(1) is bonded to four equivalent O(1) and eight equivalent O(4) atoms to form HoO12 cuboctahedra that share faces with two equivalent Ho(1)O12 cuboctahedra and faces with eight equivalent Ta(2)O6 octahedra. All Ho(1)-O(1) bond lengths are 2.59 Å. All Ho(1)-O(4) bond lengths are 2.64 Å. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-33°. Both Ta(1)-O(3) bond lengths are 1.96 Å. All Ta(1)-O(5) bond lengths are 2.00 Å. In the second Ta site, Ta(2) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra, corners with five equivalent Ta(2)O6 octahedra, and faces with two equivalent Ho(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 13-43°. The Ta(2)-O(2) bond length is 2.02 Å. The Ta(2)-O(5) bond length is 1.93 Å. Both Ta(2)-O(1) bond lengths are 1.98 Å. There is one shorter (1.99 Å) and one longer (2.04 Å) Ta(2)-O(4) bond length. Ag(1) is bonded in an L-shaped geometry to two equivalent O(2) atoms. Both Ag(1)-O(2) bond lengths are 2.67 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the second O site, O(1) is bonded in a distorted T-shaped geometry to one Ho(1) and two equivalent Ta(2) atoms. In the third O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ta(2) and two equivalent Ag(1) atoms. In the fourth O site, O(3) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the fifth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ta(2) atoms.