Sm2Ag2O5 crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. In the second Sm site, Sm(2) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form SmO12 cuboctahedra that share corners with four equivalent Sm(2)O12 cuboctahedra, faces with four equivalent Sm(2)O12 cuboctahedra, and faces with eight equivalent Ag(1)O5 square pyramids. Ag(1) is bonded to one O(2) and four equivalent O(1) atoms to form AgO5 square pyramids that share corners with five equivalent Ag(1)O5 square pyramids and faces with four equivalent Sm(2)O12 cuboctahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1), two equivalent Sm(2), and two equivalent Ag(1) atoms to form a mixture of distorted edge, corner, and face-sharing OSm4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-69°. In the second O site, O(2) is bonded to four equivalent Sm(2) and two equivalent Ag(1) atoms to form a mixture of distorted edge, corner, and face-sharing OSm4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°.
Sm2Ag2O5 crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Sm(1)-O(1) bond lengths are 2.59 Å. In the second Sm site, Sm(2) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form SmO12 cuboctahedra that share corners with four equivalent Sm(2)O12 cuboctahedra, faces with four equivalent Sm(2)O12 cuboctahedra, and faces with eight equivalent Ag(1)O5 square pyramids. All Sm(2)-O(2) bond lengths are 2.94 Å. All Sm(2)-O(1) bond lengths are 2.92 Å. Ag(1) is bonded to one O(2) and four equivalent O(1) atoms to form AgO5 square pyramids that share corners with five equivalent Ag(1)O5 square pyramids and faces with four equivalent Sm(2)O12 cuboctahedra. The Ag(1)-O(2) bond length is 2.20 Å. All Ag(1)-O(1) bond lengths are 2.08 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1), two equivalent Sm(2), and two equivalent Ag(1) atoms to form a mixture of distorted edge, corner, and face-sharing OSm4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-69°. In the second O site, O(2) is bonded to four equivalent Sm(2) and two equivalent Ag(1) atoms to form a mixture of distorted edge, corner, and face-sharing OSm4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°.