K4Co2O5 crystallizes in the tetragonal P4_2/mnm 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(1) and four equivalent O(2) atoms. In the second K site, K(2) is bonded to four equivalent O(2) atoms to form distorted corner-sharing KO4 trigonal pyramids. Co(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to two equivalent K(1) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded to two equivalent K(1), two equivalent K(2), and one Co(1) atom to form a mixture of distorted edge and corner-sharing OK4Co trigonal bipyramids.
K4Co2O5 crystallizes in the tetragonal P4_2/mnm 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(1) and four equivalent O(2) atoms. The K(1)-O(1) bond length is 2.79 Å. There are two shorter (2.70 Å) and two longer (2.71 Å) K(1)-O(2) bond lengths. In the second K site, K(2) is bonded to four equivalent O(2) atoms to form distorted corner-sharing KO4 trigonal pyramids. All K(2)-O(2) bond lengths are 2.70 Å. Co(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. The Co(1)-O(1) bond length is 1.77 Å. Both Co(1)-O(2) bond lengths are 1.75 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to two equivalent K(1) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded to two equivalent K(1), two equivalent K(2), and one Co(1) atom to form a mixture of distorted edge and corner-sharing OK4Co trigonal bipyramids.