YBaMnCoO5 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(1), and two equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share corners with four equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Mn(1)O5 square pyramids, faces with two equivalent Mn(2)O5 trigonal bipyramids, faces with two equivalent Co(1)O5 trigonal bipyramids, and faces with two equivalent Co(2)O5 trigonal bipyramids. In the second Ba site, Ba(2) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(1), and two equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share corners with four equivalent Ba(2)O12 cuboctahedra, faces with four equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Mn(1)O5 square pyramids, faces with two equivalent Mn(2)O5 trigonal bipyramids, faces with two equivalent Co(1)O5 trigonal bipyramids, and faces with two equivalent Co(2)O5 trigonal bipyramids. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(7), one O(8), and one O(9) atom to form MnO5 square pyramids that share  a cornercorner with one Co(2)O5 trigonal bipyramid, corners with four equivalent Mn(2)O5 trigonal bipyramids, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. In the second Mn site, Mn(2) is bonded to one O(10), one O(2), one O(7), one O(8), and one O(9) atom to form distorted MnO5 trigonal bipyramids that share corners with four equivalent Mn(1)O5 square pyramids,  a cornercorner with one Co(1)O5 trigonal bipyramid, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CoO5 trigonal bipyramids that share  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with four equivalent Co(2)O5 trigonal bipyramids, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. In the second Co site, Co(2) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CoO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O5 square pyramid, corners with four equivalent Co(1)O5 trigonal bipyramids, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. There are ten inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Mn(1), and one Co(2) atom to form a mixture of distorted edge and corner-sharing OBa4MnCo octahedra. The corner-sharing octahedral tilt angles are 4°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Mn(2), and one Co(1) atom to form a mixture of distorted edge and corner-sharing OBa4MnCo octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom.
YBaMnCoO5 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(1), and two equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share corners with four equivalent Ba(1)O12 cuboctahedra, faces with four equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Mn(1)O5 square pyramids, faces with two equivalent Mn(2)O5 trigonal bipyramids, faces with two equivalent Co(1)O5 trigonal bipyramids, and faces with two equivalent Co(2)O5 trigonal bipyramids. The Ba(1)-O(10) bond length is 3.28 Å. The Ba(1)-O(3) bond length is 3.06 Å. The Ba(1)-O(4) bond length is 3.06 Å. The Ba(1)-O(5) bond length is 3.11 Å. The Ba(1)-O(6) bond length is 3.08 Å. The Ba(1)-O(7) bond length is 3.20 Å. The Ba(1)-O(8) bond length is 3.19 Å. The Ba(1)-O(9) bond length is 3.25 Å. There is one shorter (2.78 Å) and one longer (2.82 Å) Ba(1)-O(1) bond length. There is one shorter (2.79 Å) and one longer (2.82 Å) Ba(1)-O(2) bond length. In the second Ba site, Ba(2) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(1), and two equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share corners with four equivalent Ba(2)O12 cuboctahedra, faces with four equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Mn(1)O5 square pyramids, faces with two equivalent Mn(2)O5 trigonal bipyramids, faces with two equivalent Co(1)O5 trigonal bipyramids, and faces with two equivalent Co(2)O5 trigonal bipyramids. The Ba(2)-O(10) bond length is 3.28 Å. The Ba(2)-O(3) bond length is 3.07 Å. The Ba(2)-O(4) bond length is 3.06 Å. The Ba(2)-O(5) bond length is 3.13 Å. The Ba(2)-O(6) bond length is 3.07 Å. The Ba(2)-O(7) bond length is 3.18 Å. The Ba(2)-O(8) bond length is 3.21 Å. The Ba(2)-O(9) bond length is 3.24 Å. There is one shorter (2.78 Å) and one longer (2.83 Å) Ba(2)-O(1) bond length. There is one shorter (2.79 Å) and one longer (2.81 Å) Ba(2)-O(2) bond length. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Y(1)-O(10) bond length is 2.43 Å. The Y(1)-O(3) bond length is 2.41 Å. The Y(1)-O(4) bond length is 2.43 Å. The Y(1)-O(5) bond length is 2.45 Å. The Y(1)-O(6) bond length is 2.46 Å. The Y(1)-O(7) bond length is 2.44 Å. The Y(1)-O(8) bond length is 2.43 Å. The Y(1)-O(9) bond length is 2.45 Å. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Y(2)-O(10) bond length is 2.42 Å. The Y(2)-O(3) bond length is 2.43 Å. The Y(2)-O(4) bond length is 2.42 Å. The Y(2)-O(5) bond length is 2.45 Å. The Y(2)-O(6) bond length is 2.46 Å. The Y(2)-O(7) bond length is 2.43 Å. The Y(2)-O(8) bond length is 2.43 Å. The Y(2)-O(9) bond length is 2.44 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(7), one O(8), and one O(9) atom to form MnO5 square pyramids that share  a cornercorner with one Co(2)O5 trigonal bipyramid, corners with four equivalent Mn(2)O5 trigonal bipyramids, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. The Mn(1)-O(1) bond length is 2.10 Å. The Mn(1)-O(10) bond length is 1.94 Å. The Mn(1)-O(7) bond length is 1.94 Å. The Mn(1)-O(8) bond length is 1.94 Å. The Mn(1)-O(9) bond length is 1.94 Å. In the second Mn site, Mn(2) is bonded to one O(10), one O(2), one O(7), one O(8), and one O(9) atom to form distorted MnO5 trigonal bipyramids that share corners with four equivalent Mn(1)O5 square pyramids,  a cornercorner with one Co(1)O5 trigonal bipyramid, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. The Mn(2)-O(10) bond length is 2.08 Å. The Mn(2)-O(2) bond length is 2.04 Å. The Mn(2)-O(7) bond length is 2.14 Å. The Mn(2)-O(8) bond length is 2.14 Å. The Mn(2)-O(9) bond length is 2.08 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CoO5 trigonal bipyramids that share  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with four equivalent Co(2)O5 trigonal bipyramids, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. The Co(1)-O(2) bond length is 1.96 Å. The Co(1)-O(3) bond length is 2.10 Å. The Co(1)-O(4) bond length is 2.10 Å. The Co(1)-O(5) bond length is 1.89 Å. The Co(1)-O(6) bond length is 1.87 Å. In the second Co site, Co(2) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CoO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O5 square pyramid, corners with four equivalent Co(1)O5 trigonal bipyramids, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with two equivalent Ba(2)O12 cuboctahedra. The Co(2)-O(1) bond length is 2.00 Å. The Co(2)-O(3) bond length is 1.99 Å. The Co(2)-O(4) bond length is 2.00 Å. The Co(2)-O(5) bond length is 2.09 Å. The Co(2)-O(6) bond length is 2.17 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Mn(1), and one Co(2) atom to form a mixture of distorted edge and corner-sharing OBa4MnCo octahedra. The corner-sharing octahedral tilt angles are 4°. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Mn(2), and one Co(1) atom to form a mixture of distorted edge and corner-sharing OBa4MnCo octahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Co(1), and one Co(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Y(1), one Y(2), one Mn(1), and one Mn(2) atom.