Sr2Mn2O5 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. Mn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing MnO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Mn(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 5-56°. In the second O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Mn(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 5-57°. In the third O site, O(3) is bonded in a 6-coordinate geometry to four equivalent Sr(1) and two equivalent Mn(1) atoms.
Sr2Mn2O5 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. Both Sr(1)-O(1) bond lengths are 2.67 Å. There are two shorter (2.61 Å) and two longer (2.74 Å) Sr(1)-O(2) bond lengths. There are a spread of Sr(1)-O(3) bond distances ranging from 2.59-2.88 Å. Mn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing MnO5 trigonal bipyramids. The Mn(1)-O(1) bond length is 1.96 Å. There is one shorter (1.89 Å) and one longer (2.02 Å) Mn(1)-O(2) bond length. Both Mn(1)-O(3) bond lengths are 1.93 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Mn(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 5-56°. In the second O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Mn(1) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 5-57°. In the third O site, O(3) is bonded in a 6-coordinate geometry to four equivalent Sr(1) and two equivalent Mn(1) atoms.