Ca5Ho3Ti5Mn3O24 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(14), one O(20), one O(21), one O(23), one O(3), one O(4), one O(8), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(19), one O(22), one O(24), one O(5), one O(6), and one O(7) atom. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(14), one O(16), one O(18), one O(23), one O(3), one O(4), one O(8), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(15), one O(16), one O(19), one O(20), and one O(8) atom. In the fifth Ca site, Ca(5) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(15), one O(16), one O(19), one O(20), one O(4), and one O(6) atom. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(15), one O(17), one O(24), one O(5), one O(6), and one O(7) atom. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to one O(12), one O(17), one O(18), one O(2), one O(21), one O(22), one O(7), and one O(9) atom. In the third Ho site, Ho(3) is bonded in a 8-coordinate geometry to one O(12), one O(17), one O(18), one O(2), one O(21), one O(22), one O(3), and one O(5) atom. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(15), one O(19), one O(24), and one O(6) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Mn(1)O6 octahedra, and corners with four equivalent Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-34°. In the second Ti site, Ti(2) is bonded to one O(1), one O(16), one O(20), one O(23), one O(4), and one O(8) atom to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 23-31°. In the third Ti site, Ti(3) is bonded to one O(18), one O(2), one O(21), one O(23), one O(3), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Mn(1)O6 octahedra, and corners with four equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-36°. In the fourth Ti site, Ti(4) is bonded to one O(11), one O(14), one O(16), one O(20), one O(4), and one O(8) atom to form TiO6 octahedra that share  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and corners with four equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-29°. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(11), one O(13), one O(15), one O(19), and one O(6) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with four equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-34°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(17), one O(2), one O(22), one O(24), one O(5), and one O(7) atom to form MnO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra, and corners with four equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-36°. In the second Mn site, Mn(2) is bonded to one O(12), one O(13), one O(17), one O(22), one O(5), and one O(7) atom to form MnO6 octahedra that share  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-36°. In the third Mn site, Mn(3) is bonded to one O(12), one O(14), one O(18), one O(21), one O(3), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with four equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-36°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to one Ho(2), one Ho(3), one Ti(3), and one Mn(1) atom to form distorted OHo2TiMn trigonal pyramids that share  a cornercorner with one O(23)Ca2Ti2 tetrahedra,  a cornercorner with one O(24)CaHoTiMn tetrahedra, and corners with two equivalent O(12)Ho2Mn2 trigonal pyramids. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ho(3), one Ti(3), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ca(5), one Ti(2), and one Ti(4) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Ca(2), one Ho(1), one Ho(3), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(5), one Ho(1), one Ti(1), and one Ti(5) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ca(2), one Ho(1), one Ho(2), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ca(4), one Ti(2), and one Ti(4) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ho(2), one Ti(3), and one Mn(3) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(4), one Ho(1), one Ti(1), and one Ti(5) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ti(4), and one Ti(5) atom. In the twelfth O site, O(12) is bonded to one Ho(2), one Ho(3), one Mn(2), and one Mn(3) atom to form distorted OHo2Mn2 trigonal pyramids that share  a cornercorner with one O(13)CaHoTiMn tetrahedra and corners with two equivalent O(2)Ho2TiMn trigonal pyramids. In the thirteenth O site, O(13) is bonded to one Ca(2), one Ho(1), one Ti(5), and one Mn(2) atom to form distorted OCaHoTiMn tetrahedra that share corners with two equivalent O(24)CaHoTiMn tetrahedra and  a cornercorner with one O(12)Ho2Mn2 trigonal pyramid. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Ti(4), and one Mn(3) atom. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Ca(4), one Ca(5), one Ho(1), one Ti(1), and one Ti(5) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(4), one Ca(5), one Ti(2), and one Ti(4) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Ho(1), one Ho(2), one Ho(3), one Mn(1), and one Mn(2) atom. In the eighteenth O site, O(18) is bonded in a 5-coordinate geometry to one Ca(3), one Ho(2), one Ho(3), one Ti(3), and one Mn(3) atom. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(4), one Ca(5), one Ti(1), and one Ti(5) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Ti(2), and one Ti(4) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Ca(1), one Ho(2), one Ho(3), one Ti(3), and one Mn(3) atom. In the twenty-second O site, O(22) is bonded in a 5-coordinate geometry to one Ca(2), one Ho(2), one Ho(3), one Mn(1), and one Mn(2) atom. In the twenty-third O site, O(23) is bonded to one Ca(1), one Ca(3), one Ti(2), and one Ti(3) atom to form distorted corner-sharing OCa2Ti2 tetrahedra. In the twenty-fourth O site, O(24) is bonded to one Ca(2), one Ho(1), one Ti(1), and one Mn(1) atom to form distorted OCaHoTiMn tetrahedra that share corners with two equivalent O(13)CaHoTiMn tetrahedra and  a cornercorner with one O(2)Ho2TiMn trigonal pyramid.
Ca5Ho3Ti5Mn3O24 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(14), one O(20), one O(21), one O(23), one O(3), one O(4), one O(8), and one O(9) atom. The Ca(1)-O(14) bond length is 2.36 Å. The Ca(1)-O(20) bond length is 2.72 Å. The Ca(1)-O(21) bond length is 2.74 Å. The Ca(1)-O(23) bond length is 2.44 Å. The Ca(1)-O(3) bond length is 2.31 Å. The Ca(1)-O(4) bond length is 2.41 Å. The Ca(1)-O(8) bond length is 2.57 Å. The Ca(1)-O(9) bond length is 2.67 Å. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(19), one O(22), one O(24), one O(5), one O(6), and one O(7) atom. The Ca(2)-O(10) bond length is 2.58 Å. The Ca(2)-O(13) bond length is 2.32 Å. The Ca(2)-O(19) bond length is 2.68 Å. The Ca(2)-O(22) bond length is 2.73 Å. The Ca(2)-O(24) bond length is 2.41 Å. The Ca(2)-O(5) bond length is 2.31 Å. The Ca(2)-O(6) bond length is 2.44 Å. The Ca(2)-O(7) bond length is 2.61 Å. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(14), one O(16), one O(18), one O(23), one O(3), one O(4), one O(8), and one O(9) atom. The Ca(3)-O(14) bond length is 2.41 Å. The Ca(3)-O(16) bond length is 2.68 Å. The Ca(3)-O(18) bond length is 2.79 Å. The Ca(3)-O(23) bond length is 2.32 Å. The Ca(3)-O(3) bond length is 2.69 Å. The Ca(3)-O(4) bond length is 2.62 Å. The Ca(3)-O(8) bond length is 2.43 Å. The Ca(3)-O(9) bond length is 2.30 Å. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(15), one O(16), one O(19), one O(20), and one O(8) atom. The Ca(4)-O(1) bond length is 2.36 Å. The Ca(4)-O(10) bond length is 2.75 Å. The Ca(4)-O(11) bond length is 2.47 Å. The Ca(4)-O(15) bond length is 2.38 Å. The Ca(4)-O(16) bond length is 2.37 Å. The Ca(4)-O(19) bond length is 2.67 Å. The Ca(4)-O(20) bond length is 2.55 Å. The Ca(4)-O(8) bond length is 2.64 Å. In the fifth Ca site, Ca(5) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(15), one O(16), one O(19), one O(20), one O(4), and one O(6) atom. The Ca(5)-O(1) bond length is 2.48 Å. The Ca(5)-O(11) bond length is 2.32 Å. The Ca(5)-O(15) bond length is 2.68 Å. The Ca(5)-O(16) bond length is 2.55 Å. The Ca(5)-O(19) bond length is 2.38 Å. The Ca(5)-O(20) bond length is 2.39 Å. The Ca(5)-O(4) bond length is 2.63 Å. The Ca(5)-O(6) bond length is 2.81 Å. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(15), one O(17), one O(24), one O(5), one O(6), and one O(7) atom. The Ho(1)-O(10) bond length is 2.36 Å. The Ho(1)-O(13) bond length is 2.28 Å. The Ho(1)-O(15) bond length is 2.66 Å. The Ho(1)-O(17) bond length is 2.62 Å. The Ho(1)-O(24) bond length is 2.27 Å. The Ho(1)-O(5) bond length is 2.46 Å. The Ho(1)-O(6) bond length is 2.46 Å. The Ho(1)-O(7) bond length is 2.26 Å. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to one O(12), one O(17), one O(18), one O(2), one O(21), one O(22), one O(7), and one O(9) atom. The Ho(2)-O(12) bond length is 2.32 Å. The Ho(2)-O(17) bond length is 2.31 Å. The Ho(2)-O(18) bond length is 2.27 Å. The Ho(2)-O(2) bond length is 2.26 Å. The Ho(2)-O(21) bond length is 2.48 Å. The Ho(2)-O(22) bond length is 2.46 Å. The Ho(2)-O(7) bond length is 2.59 Å. The Ho(2)-O(9) bond length is 2.60 Å. In the third Ho site, Ho(3) is bonded in a 8-coordinate geometry to one O(12), one O(17), one O(18), one O(2), one O(21), one O(22), one O(3), and one O(5) atom. The Ho(3)-O(12) bond length is 2.27 Å. The Ho(3)-O(17) bond length is 2.49 Å. The Ho(3)-O(18) bond length is 2.41 Å. The Ho(3)-O(2) bond length is 2.33 Å. The Ho(3)-O(21) bond length is 2.32 Å. The Ho(3)-O(22) bond length is 2.28 Å. The Ho(3)-O(3) bond length is 2.58 Å. The Ho(3)-O(5) bond length is 2.71 Å. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(15), one O(19), one O(24), and one O(6) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Mn(1)O6 octahedra, and corners with four equivalent Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-34°. The Ti(1)-O(1) bond length is 1.97 Å. The Ti(1)-O(10) bond length is 2.15 Å. The Ti(1)-O(15) bond length is 1.88 Å. The Ti(1)-O(19) bond length is 2.08 Å. The Ti(1)-O(24) bond length is 1.97 Å. The Ti(1)-O(6) bond length is 1.93 Å. In the second Ti site, Ti(2) is bonded to one O(1), one O(16), one O(20), one O(23), one O(4), and one O(8) atom to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 23-31°. The Ti(2)-O(1) bond length is 1.99 Å. The Ti(2)-O(16) bond length is 2.07 Å. The Ti(2)-O(20) bond length is 2.06 Å. The Ti(2)-O(23) bond length is 1.96 Å. The Ti(2)-O(4) bond length is 1.94 Å. The Ti(2)-O(8) bond length is 1.92 Å. In the third Ti site, Ti(3) is bonded to one O(18), one O(2), one O(21), one O(23), one O(3), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Mn(1)O6 octahedra, and corners with four equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-36°. The Ti(3)-O(18) bond length is 1.99 Å. The Ti(3)-O(2) bond length is 2.01 Å. The Ti(3)-O(21) bond length is 2.04 Å. The Ti(3)-O(23) bond length is 1.98 Å. The Ti(3)-O(3) bond length is 1.98 Å. The Ti(3)-O(9) bond length is 1.87 Å. In the fourth Ti site, Ti(4) is bonded to one O(11), one O(14), one O(16), one O(20), one O(4), and one O(8) atom to form TiO6 octahedra that share  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and corners with four equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-29°. The Ti(4)-O(11) bond length is 2.02 Å. The Ti(4)-O(14) bond length is 1.95 Å. The Ti(4)-O(16) bond length is 1.94 Å. The Ti(4)-O(20) bond length is 1.92 Å. The Ti(4)-O(4) bond length is 2.04 Å. The Ti(4)-O(8) bond length is 2.09 Å. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(11), one O(13), one O(15), one O(19), and one O(6) atom to form TiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with four equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-34°. The Ti(5)-O(10) bond length is 1.92 Å. The Ti(5)-O(11) bond length is 1.96 Å. The Ti(5)-O(13) bond length is 1.94 Å. The Ti(5)-O(15) bond length is 2.15 Å. The Ti(5)-O(19) bond length is 1.89 Å. The Ti(5)-O(6) bond length is 2.12 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(17), one O(2), one O(22), one O(24), one O(5), and one O(7) atom to form MnO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra, and corners with four equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-36°. The Mn(1)-O(17) bond length is 1.95 Å. The Mn(1)-O(2) bond length is 2.00 Å. The Mn(1)-O(22) bond length is 2.14 Å. The Mn(1)-O(24) bond length is 2.01 Å. The Mn(1)-O(5) bond length is 2.11 Å. The Mn(1)-O(7) bond length is 1.94 Å. In the second Mn site, Mn(2) is bonded to one O(12), one O(13), one O(17), one O(22), one O(5), and one O(7) atom to form MnO6 octahedra that share  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-36°. The Mn(2)-O(12) bond length is 2.04 Å. The Mn(2)-O(13) bond length is 2.03 Å. The Mn(2)-O(17) bond length is 2.16 Å. The Mn(2)-O(22) bond length is 1.94 Å. The Mn(2)-O(5) bond length is 1.91 Å. The Mn(2)-O(7) bond length is 2.11 Å. In the third Mn site, Mn(3) is bonded to one O(12), one O(14), one O(18), one O(21), one O(3), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with four equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-36°. The Mn(3)-O(12) bond length is 1.95 Å. The Mn(3)-O(14) bond length is 1.97 Å. The Mn(3)-O(18) bond length is 2.17 Å. The Mn(3)-O(21) bond length is 2.07 Å. The Mn(3)-O(3) bond length is 1.99 Å. The Mn(3)-O(9) bond length is 2.13 Å. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to one Ho(2), one Ho(3), one Ti(3), and one Mn(1) atom to form distorted OHo2TiMn trigonal pyramids that share  a cornercorner with one O(23)Ca2Ti2 tetrahedra,  a cornercorner with one O(24)CaHoTiMn tetrahedra, and corners with two equivalent O(12)Ho2Mn2 trigonal pyramids. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ho(3), one Ti(3), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ca(5), one Ti(2), and one Ti(4) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Ca(2), one Ho(1), one Ho(3), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(5), one Ho(1), one Ti(1), and one Ti(5) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ca(2), one Ho(1), one Ho(2), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ca(4), one Ti(2), and one Ti(4) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(3), one Ho(2), one Ti(3), and one Mn(3) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(4), one Ho(1), one Ti(1), and one Ti(5) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ti(4), and one Ti(5) atom. In the twelfth O site, O(12) is bonded to one Ho(2), one Ho(3), one Mn(2), and one Mn(3) atom to form distorted OHo2Mn2 trigonal pyramids that share  a cornercorner with one O(13)CaHoTiMn tetrahedra and corners with two equivalent O(2)Ho2TiMn trigonal pyramids. In the thirteenth O site, O(13) is bonded to one Ca(2), one Ho(1), one Ti(5), and one Mn(2) atom to form distorted OCaHoTiMn tetrahedra that share corners with two equivalent O(24)CaHoTiMn tetrahedra and  a cornercorner with one O(12)Ho2Mn2 trigonal pyramid. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Ti(4), and one Mn(3) atom. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Ca(4), one Ca(5), one Ho(1), one Ti(1), and one Ti(5) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(4), one Ca(5), one Ti(2), and one Ti(4) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Ho(1), one Ho(2), one Ho(3), one Mn(1), and one Mn(2) atom. In the eighteenth O site, O(18) is bonded in a 5-coordinate geometry to one Ca(3), one Ho(2), one Ho(3), one Ti(3), and one Mn(3) atom. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(4), one Ca(5), one Ti(1), and one Ti(5) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Ti(2), and one Ti(4) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Ca(1), one Ho(2), one Ho(3), one Ti(3), and one Mn(3) atom. In the twenty-second O site, O(22) is bonded in a 5-coordinate geometry to one Ca(2), one Ho(2), one Ho(3), one Mn(1), and one Mn(2) atom. In the twenty-third O site, O(23) is bonded to one Ca(1), one Ca(3), one Ti(2), and one Ti(3) atom to form distorted corner-sharing OCa2Ti2 tetrahedra. In the twenty-fourth O site, O(24) is bonded to one Ca(2), one Ho(1), one Ti(1), and one Mn(1) atom to form distorted OCaHoTiMn tetrahedra that share corners with two equivalent O(13)CaHoTiMn tetrahedra and  a cornercorner with one O(2)Ho2TiMn trigonal pyramid.