Ba2CoGe2O7 crystallizes in the triclinic P1 space group. There are eight inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(11), one O(13), one O(15), one O(21), one O(27), one O(3), one O(5), and one O(7) atom. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(12), one O(14), one O(16), one O(22), one O(28), one O(4), one O(6), and one O(8) atom. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(15), one O(23), one O(25), one O(5), one O(7), and one O(9) atom. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(16), one O(2), one O(24), one O(26), one O(6), and one O(8) atom. In the fifth Ba site, Ba(5) is bonded in a 8-coordinate geometry to one O(11), one O(17), one O(19), one O(23), one O(25), one O(3), one O(7), and one O(9) atom. In the sixth Ba site, Ba(6) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(18), one O(20), one O(24), one O(26), one O(4), and one O(8) atom. In the seventh Ba site, Ba(7) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(17), one O(19), one O(21), one O(27), one O(5), and one O(9) atom. In the eighth Ba site, Ba(8) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(18), one O(2), one O(20), one O(22), one O(28), and one O(6) atom. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(14), one O(18), one O(21), and one O(25) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(2)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra,  a cornercorner with one Ge(6)O4 tetrahedra, and  a cornercorner with one Ge(7)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(16), one O(20), one O(23), and one O(27) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra,  a cornercorner with one Ge(5)O4 tetrahedra, and  a cornercorner with one Ge(8)O4 tetrahedra. In the third Co site, Co(3) is bonded to one O(13), one O(17), one O(22), and one O(26) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra,  a cornercorner with one Ge(5)O4 tetrahedra, and  a cornercorner with one Ge(8)O4 tetrahedra. In the fourth Co site, Co(4) is bonded to one O(15), one O(19), one O(24), and one O(28) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(2)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra,  a cornercorner with one Ge(6)O4 tetrahedra, and  a cornercorner with one Ge(7)O4 tetrahedra. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(13), one O(27), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(5)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(14), one O(2), one O(28), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(6)O4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(15), one O(25), one O(3), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(7)O4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(16), one O(26), one O(4), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(8)O4 tetrahedra. In the fifth Ge site, Ge(5) is bonded to one O(1), one O(10), one O(17), and one O(23) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(1)O4 tetrahedra. In the sixth Ge site, Ge(6) is bonded to one O(18), one O(2), one O(24), and one O(9) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. In the seventh Ge site, Ge(7) is bonded to one O(12), one O(19), one O(21), and one O(3) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(3)O4 tetrahedra. In the eighth Ge site, Ge(8) is bonded to one O(11), one O(20), one O(22), and one O(4) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 tetrahedra. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(3), one Ba(7), one Ge(1), and one Ge(5) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(4), one Ba(8), one Ge(2), and one Ge(6) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(5), one Ge(3), and one Ge(7) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(6), one Ge(4), and one Ge(8) atom. In the fifth O site, O(5) is bonded to one Ba(1), one Ba(3), one Ba(7), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the sixth O site, O(6) is bonded to one Ba(2), one Ba(4), one Ba(8), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the seventh O site, O(7) is bonded to one Ba(1), one Ba(3), one Ba(5), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the eighth O site, O(8) is bonded to one Ba(2), one Ba(4), one Ba(6), and one Ge(3) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the ninth O site, O(9) is bonded to one Ba(3), one Ba(5), one Ba(7), and one Ge(6) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the tenth O site, O(10) is bonded to one Ba(4), one Ba(6), one Ba(8), and one Ge(5) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the eleventh O site, O(11) is bonded to one Ba(1), one Ba(5), one Ba(7), and one Ge(8) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the twelfth O site, O(12) is bonded to one Ba(2), one Ba(6), one Ba(8), and one Ge(7) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Co(3), and one Ge(1) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Co(1), and one Ge(2) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Co(4), and one Ge(3) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Co(2), and one Ge(4) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Ba(5), one Ba(7), one Co(3), and one Ge(5) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Ba(6), one Ba(8), one Co(1), and one Ge(6) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Ba(5), one Ba(7), one Co(4), and one Ge(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Ba(6), one Ba(8), one Co(2), and one Ge(8) atom. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(7), one Co(1), and one Ge(7) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(8), one Co(3), and one Ge(8) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Ba(3), one Ba(5), one Co(2), and one Ge(5) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Ba(4), one Ba(6), one Co(4), and one Ge(6) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Ba(3), one Ba(5), one Co(1), and one Ge(3) atom. In the twenty-sixth O site, O(26) is bonded in a 4-coordinate geometry to one Ba(4), one Ba(6), one Co(3), and one Ge(4) atom. In the twenty-seventh O site, O(27) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(7), one Co(2), and one Ge(1) atom. In the twenty-eighth O site, O(28) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(8), one Co(4), and one Ge(2) atom.
Ba2CoGe2O7 crystallizes in the triclinic P1 space group. There are eight inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one O(11), one O(13), one O(15), one O(21), one O(27), one O(3), one O(5), and one O(7) atom. The Ba(1)-O(11) bond length is 2.87 Å. The Ba(1)-O(13) bond length is 2.77 Å. The Ba(1)-O(15) bond length is 3.05 Å. The Ba(1)-O(21) bond length is 3.05 Å. The Ba(1)-O(27) bond length is 2.77 Å. The Ba(1)-O(3) bond length is 2.79 Å. The Ba(1)-O(5) bond length is 2.71 Å. The Ba(1)-O(7) bond length is 2.87 Å. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(12), one O(14), one O(16), one O(22), one O(28), one O(4), one O(6), and one O(8) atom. The Ba(2)-O(12) bond length is 2.87 Å. The Ba(2)-O(14) bond length is 2.77 Å. The Ba(2)-O(16) bond length is 3.06 Å. The Ba(2)-O(22) bond length is 3.05 Å. The Ba(2)-O(28) bond length is 2.77 Å. The Ba(2)-O(4) bond length is 2.79 Å. The Ba(2)-O(6) bond length is 2.71 Å. The Ba(2)-O(8) bond length is 2.87 Å. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(15), one O(23), one O(25), one O(5), one O(7), and one O(9) atom. The Ba(3)-O(1) bond length is 2.79 Å. The Ba(3)-O(13) bond length is 3.04 Å. The Ba(3)-O(15) bond length is 2.77 Å. The Ba(3)-O(23) bond length is 3.06 Å. The Ba(3)-O(25) bond length is 2.77 Å. The Ba(3)-O(5) bond length is 2.87 Å. The Ba(3)-O(7) bond length is 2.72 Å. The Ba(3)-O(9) bond length is 2.88 Å. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(16), one O(2), one O(24), one O(26), one O(6), and one O(8) atom. The Ba(4)-O(10) bond length is 2.88 Å. The Ba(4)-O(14) bond length is 3.04 Å. The Ba(4)-O(16) bond length is 2.77 Å. The Ba(4)-O(2) bond length is 2.79 Å. The Ba(4)-O(24) bond length is 3.05 Å. The Ba(4)-O(26) bond length is 2.77 Å. The Ba(4)-O(6) bond length is 2.87 Å. The Ba(4)-O(8) bond length is 2.72 Å. In the fifth Ba site, Ba(5) is bonded in a 8-coordinate geometry to one O(11), one O(17), one O(19), one O(23), one O(25), one O(3), one O(7), and one O(9) atom. The Ba(5)-O(11) bond length is 2.88 Å. The Ba(5)-O(17) bond length is 2.77 Å. The Ba(5)-O(19) bond length is 3.05 Å. The Ba(5)-O(23) bond length is 2.76 Å. The Ba(5)-O(25) bond length is 3.04 Å. The Ba(5)-O(3) bond length is 2.79 Å. The Ba(5)-O(7) bond length is 2.87 Å. The Ba(5)-O(9) bond length is 2.72 Å. In the sixth Ba site, Ba(6) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(18), one O(20), one O(24), one O(26), one O(4), and one O(8) atom. The Ba(6)-O(10) bond length is 2.71 Å. The Ba(6)-O(12) bond length is 2.87 Å. The Ba(6)-O(18) bond length is 2.76 Å. The Ba(6)-O(20) bond length is 3.05 Å. The Ba(6)-O(24) bond length is 2.77 Å. The Ba(6)-O(26) bond length is 3.04 Å. The Ba(6)-O(4) bond length is 2.79 Å. The Ba(6)-O(8) bond length is 2.88 Å. In the seventh Ba site, Ba(7) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(17), one O(19), one O(21), one O(27), one O(5), and one O(9) atom. The Ba(7)-O(1) bond length is 2.79 Å. The Ba(7)-O(11) bond length is 2.71 Å. The Ba(7)-O(17) bond length is 3.04 Å. The Ba(7)-O(19) bond length is 2.77 Å. The Ba(7)-O(21) bond length is 2.77 Å. The Ba(7)-O(27) bond length is 3.04 Å. The Ba(7)-O(5) bond length is 2.88 Å. The Ba(7)-O(9) bond length is 2.87 Å. In the eighth Ba site, Ba(8) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(18), one O(2), one O(20), one O(22), one O(28), and one O(6) atom. The Ba(8)-O(10) bond length is 2.87 Å. The Ba(8)-O(12) bond length is 2.72 Å. The Ba(8)-O(18) bond length is 3.05 Å. The Ba(8)-O(2) bond length is 2.79 Å. The Ba(8)-O(20) bond length is 2.77 Å. The Ba(8)-O(22) bond length is 2.77 Å. The Ba(8)-O(28) bond length is 3.05 Å. The Ba(8)-O(6) bond length is 2.88 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(14), one O(18), one O(21), and one O(25) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(2)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra,  a cornercorner with one Ge(6)O4 tetrahedra, and  a cornercorner with one Ge(7)O4 tetrahedra. The Co(1)-O(14) bond length is 2.00 Å. The Co(1)-O(18) bond length is 2.00 Å. The Co(1)-O(21) bond length is 2.00 Å. The Co(1)-O(25) bond length is 2.00 Å. In the second Co site, Co(2) is bonded to one O(16), one O(20), one O(23), and one O(27) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra,  a cornercorner with one Ge(5)O4 tetrahedra, and  a cornercorner with one Ge(8)O4 tetrahedra. The Co(2)-O(16) bond length is 2.00 Å. The Co(2)-O(20) bond length is 2.00 Å. The Co(2)-O(23) bond length is 2.00 Å. The Co(2)-O(27) bond length is 2.00 Å. In the third Co site, Co(3) is bonded to one O(13), one O(17), one O(22), and one O(26) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra,  a cornercorner with one Ge(5)O4 tetrahedra, and  a cornercorner with one Ge(8)O4 tetrahedra. The Co(3)-O(13) bond length is 2.00 Å. The Co(3)-O(17) bond length is 2.00 Å. The Co(3)-O(22) bond length is 2.00 Å. The Co(3)-O(26) bond length is 2.00 Å. In the fourth Co site, Co(4) is bonded to one O(15), one O(19), one O(24), and one O(28) atom to form CoO4 tetrahedra that share  a cornercorner with one Ge(2)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra,  a cornercorner with one Ge(6)O4 tetrahedra, and  a cornercorner with one Ge(7)O4 tetrahedra. The Co(4)-O(15) bond length is 2.00 Å. The Co(4)-O(19) bond length is 2.00 Å. The Co(4)-O(24) bond length is 2.00 Å. The Co(4)-O(28) bond length is 2.00 Å. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(13), one O(27), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(5)O4 tetrahedra. The Ge(1)-O(1) bond length is 1.83 Å. The Ge(1)-O(13) bond length is 1.79 Å. The Ge(1)-O(27) bond length is 1.78 Å. The Ge(1)-O(6) bond length is 1.75 Å. In the second Ge site, Ge(2) is bonded to one O(14), one O(2), one O(28), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(6)O4 tetrahedra. The Ge(2)-O(14) bond length is 1.79 Å. The Ge(2)-O(2) bond length is 1.83 Å. The Ge(2)-O(28) bond length is 1.79 Å. The Ge(2)-O(5) bond length is 1.74 Å. In the third Ge site, Ge(3) is bonded to one O(15), one O(25), one O(3), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(7)O4 tetrahedra. The Ge(3)-O(15) bond length is 1.79 Å. The Ge(3)-O(25) bond length is 1.79 Å. The Ge(3)-O(3) bond length is 1.83 Å. The Ge(3)-O(8) bond length is 1.74 Å. In the fourth Ge site, Ge(4) is bonded to one O(16), one O(26), one O(4), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(8)O4 tetrahedra. The Ge(4)-O(16) bond length is 1.78 Å. The Ge(4)-O(26) bond length is 1.79 Å. The Ge(4)-O(4) bond length is 1.83 Å. The Ge(4)-O(7) bond length is 1.75 Å. In the fifth Ge site, Ge(5) is bonded to one O(1), one O(10), one O(17), and one O(23) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(1)O4 tetrahedra. The Ge(5)-O(1) bond length is 1.83 Å. The Ge(5)-O(10) bond length is 1.75 Å. The Ge(5)-O(17) bond length is 1.79 Å. The Ge(5)-O(23) bond length is 1.78 Å. In the sixth Ge site, Ge(6) is bonded to one O(18), one O(2), one O(24), and one O(9) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. The Ge(6)-O(18) bond length is 1.79 Å. The Ge(6)-O(2) bond length is 1.83 Å. The Ge(6)-O(24) bond length is 1.79 Å. The Ge(6)-O(9) bond length is 1.74 Å. In the seventh Ge site, Ge(7) is bonded to one O(12), one O(19), one O(21), and one O(3) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Co(4)O4 tetrahedra, and  a cornercorner with one Ge(3)O4 tetrahedra. The Ge(7)-O(12) bond length is 1.74 Å. The Ge(7)-O(19) bond length is 1.79 Å. The Ge(7)-O(21) bond length is 1.79 Å. The Ge(7)-O(3) bond length is 1.83 Å. In the eighth Ge site, Ge(8) is bonded to one O(11), one O(20), one O(22), and one O(4) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(2)O4 tetrahedra,  a cornercorner with one Co(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 tetrahedra. The Ge(8)-O(11) bond length is 1.75 Å. The Ge(8)-O(20) bond length is 1.79 Å. The Ge(8)-O(22) bond length is 1.79 Å. The Ge(8)-O(4) bond length is 1.83 Å. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(3), one Ba(7), one Ge(1), and one Ge(5) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(4), one Ba(8), one Ge(2), and one Ge(6) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(5), one Ge(3), and one Ge(7) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(6), one Ge(4), and one Ge(8) atom. In the fifth O site, O(5) is bonded to one Ba(1), one Ba(3), one Ba(7), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the sixth O site, O(6) is bonded to one Ba(2), one Ba(4), one Ba(8), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the seventh O site, O(7) is bonded to one Ba(1), one Ba(3), one Ba(5), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the eighth O site, O(8) is bonded to one Ba(2), one Ba(4), one Ba(6), and one Ge(3) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the ninth O site, O(9) is bonded to one Ba(3), one Ba(5), one Ba(7), and one Ge(6) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the tenth O site, O(10) is bonded to one Ba(4), one Ba(6), one Ba(8), and one Ge(5) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the eleventh O site, O(11) is bonded to one Ba(1), one Ba(5), one Ba(7), and one Ge(8) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the twelfth O site, O(12) is bonded to one Ba(2), one Ba(6), one Ba(8), and one Ge(7) atom to form a mixture of distorted edge and corner-sharing OBa3Ge tetrahedra. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Co(3), and one Ge(1) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Co(1), and one Ge(2) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Co(4), and one Ge(3) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Co(2), and one Ge(4) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Ba(5), one Ba(7), one Co(3), and one Ge(5) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Ba(6), one Ba(8), one Co(1), and one Ge(6) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Ba(5), one Ba(7), one Co(4), and one Ge(7) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Ba(6), one Ba(8), one Co(2), and one Ge(8) atom. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(7), one Co(1), and one Ge(7) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(8), one Co(3), and one Ge(8) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Ba(3), one Ba(5), one Co(2), and one Ge(5) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Ba(4), one Ba(6), one Co(4), and one Ge(6) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Ba(3), one Ba(5), one Co(1), and one Ge(3) atom. In the twenty-sixth O site, O(26) is bonded in a 4-coordinate geometry to one Ba(4), one Ba(6), one Co(3), and one Ge(4) atom. In the twenty-seventh O site, O(27) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(7), one Co(2), and one Ge(1) atom. In the twenty-eighth O site, O(28) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(8), one Co(4), and one Ge(2) atom.