CaMn2O5 crystallizes in the orthorhombic Pmc2_1 space group. Ca(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form corner-sharing MnO5 trigonal bipyramids. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form corner-sharing MnO5 square pyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to two equivalent Ca(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Ca(1), one Mn(1), and one Mn(2) atom. In the third O site, O(3) is bonded to two equivalent Ca(1), one Mn(1), and one Mn(2) atom to form distorted corner-sharing OCa2Mn2 tetrahedra. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Ca(1) and two equivalent Mn(1) atoms. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to two equivalent Ca(1) and two equivalent Mn(2) atoms.
CaMn2O5 crystallizes in the orthorhombic Pmc2_1 space group. Ca(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Both Ca(1)-O(1) bond lengths are 2.35 Å. Both Ca(1)-O(2) bond lengths are 2.71 Å. Both Ca(1)-O(3) bond lengths are 2.38 Å. There is one shorter (2.73 Å) and one longer (2.79 Å) Ca(1)-O(4) bond length. There is one shorter (2.54 Å) and one longer (2.67 Å) Ca(1)-O(5) bond length. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form corner-sharing MnO5 trigonal bipyramids. The Mn(1)-O(1) bond length is 1.96 Å. The Mn(1)-O(2) bond length is 1.83 Å. The Mn(1)-O(3) bond length is 1.90 Å. Both Mn(1)-O(4) bond lengths are 1.91 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form corner-sharing MnO5 square pyramids. The Mn(2)-O(1) bond length is 1.88 Å. The Mn(2)-O(2) bond length is 1.97 Å. The Mn(2)-O(3) bond length is 1.85 Å. Both Mn(2)-O(5) bond lengths are 1.89 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to two equivalent Ca(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Ca(1), one Mn(1), and one Mn(2) atom. In the third O site, O(3) is bonded to two equivalent Ca(1), one Mn(1), and one Mn(2) atom to form distorted corner-sharing OCa2Mn2 tetrahedra. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Ca(1) and two equivalent Mn(1) atoms. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to two equivalent Ca(1) and two equivalent Mn(2) atoms.