K2MgMn2O4 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(2), and two equivalent O(4) atoms. Mg(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second Mn site, Mn(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent K(1), one Mg(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(2), two equivalent Mg(1), and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), and two equivalent Mn(2) atoms.
K2MgMn2O4 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(3) atoms. The K(1)-O(4) bond length is 2.75 Å. There is one shorter (2.80 Å) and one longer (2.83 Å) K(1)-O(1) bond length. There is one shorter (2.70 Å) and one longer (2.73 Å) K(1)-O(3) bond length. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(2), and two equivalent O(4) atoms. The K(2)-O(3) bond length is 2.60 Å. There is one shorter (3.13 Å) and one longer (3.19 Å) K(2)-O(2) bond length. There is one shorter (2.65 Å) and one longer (2.67 Å) K(2)-O(4) bond length. Mg(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. The Mg(1)-O(1) bond length is 1.89 Å. Both Mg(1)-O(2) bond lengths are 1.97 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. There is one shorter (2.14 Å) and one longer (2.15 Å) Mn(1)-O(1) bond length. There is one shorter (2.02 Å) and one longer (2.03 Å) Mn(1)-O(3) bond length. In the second Mn site, Mn(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(4) atoms. There is one shorter (2.36 Å) and one longer (2.40 Å) Mn(2)-O(2) bond length. Both Mn(2)-O(4) bond lengths are 1.99 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent K(1), one Mg(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(2), two equivalent Mg(1), and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), and two equivalent Mn(2) atoms.