Nb2Co(PbO3)3 crystallizes in the monoclinic C2/m space group. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(11), one O(4), two equivalent O(1), and two equivalent O(9) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a faceface with one Pb(6)O12 cuboctahedra,  a faceface with one Pb(7)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra, and faces with three equivalent Pb(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the second Nb site, Nb(2) is bonded to one O(14), one O(5), two equivalent O(2), and two equivalent O(8) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a faceface with one Pb(3)O12 cuboctahedra,  a faceface with one Pb(4)O12 cuboctahedra, faces with two equivalent Pb(2)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, and faces with two equivalent Pb(7)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third Nb site, Nb(3) is bonded to one O(13), one O(4), two equivalent O(3), and two equivalent O(7) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a faceface with one Pb(4)O12 cuboctahedra,  a faceface with one Pb(5)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra, and faces with three equivalent Pb(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the fourth Nb site, Nb(4) is bonded to one O(12), one O(6), two equivalent O(10), and two equivalent O(2) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a faceface with one Pb(2)O12 cuboctahedra,  a faceface with one Pb(6)O12 cuboctahedra, faces with two equivalent Pb(3)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, and faces with two equivalent Pb(7)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(11), one O(12), two equivalent O(7), and two equivalent O(8) atoms to form CoO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(4)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra,  a faceface with one Pb(1)O12 cuboctahedra,  a faceface with one Pb(2)O12 cuboctahedra,  a faceface with one Pb(6)O12 cuboctahedra,  a faceface with one Pb(7)O12 cuboctahedra, faces with two equivalent Pb(4)O12 cuboctahedra, and faces with two equivalent Pb(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 3-4°. In the second Co site, Co(2) is bonded to one O(13), one O(14), two equivalent O(10), and two equivalent O(9) atoms to form CoO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra,  a faceface with one Pb(1)O12 cuboctahedra,  a faceface with one Pb(3)O12 cuboctahedra,  a faceface with one Pb(4)O12 cuboctahedra,  a faceface with one Pb(5)O12 cuboctahedra, faces with two equivalent Pb(6)O12 cuboctahedra, and faces with two equivalent Pb(7)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. There are seven inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to one O(11), one O(13), two equivalent O(1), two equivalent O(3), two equivalent O(4), two equivalent O(7), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share corners with three equivalent Pb(5)O12 cuboctahedra, corners with three equivalent Pb(7)O12 cuboctahedra, corners with six equivalent Pb(1)O12 cuboctahedra, faces with three equivalent Pb(4)O12 cuboctahedra, faces with three equivalent Pb(6)O12 cuboctahedra,  a faceface with one Co(1)O6 octahedra,  a faceface with one Co(2)O6 octahedra, faces with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Nb(3)O6 octahedra. In the second Pb site, Pb(2) is bonded to two equivalent O(12), two equivalent O(5), four equivalent O(2), and four equivalent O(8) atoms to form distorted PbO12 cuboctahedra that share corners with two equivalent Pb(2)O12 cuboctahedra, corners with two equivalent Pb(6)O12 cuboctahedra, corners with four equivalent Pb(3)O12 cuboctahedra, corners with four equivalent Pb(4)O12 cuboctahedra, faces with two equivalent Pb(7)O12 cuboctahedra, faces with four equivalent Pb(5)O12 cuboctahedra, faces with two equivalent Nb(4)O6 octahedra, faces with two equivalent Co(1)O6 octahedra, and faces with four equivalent Nb(2)O6 octahedra. In the third Pb site, Pb(3) is bonded to two equivalent O(14), two equivalent O(6), four equivalent O(10), and four equivalent O(2) atoms to form distorted PbO12 cuboctahedra that share corners with two equivalent Pb(3)O12 cuboctahedra, corners with two equivalent Pb(4)O12 cuboctahedra, corners with four equivalent Pb(2)O12 cuboctahedra, corners with four equivalent Pb(6)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, faces with four equivalent Pb(7)O12 cuboctahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Co(2)O6 octahedra, and faces with four equivalent Nb(4)O6 octahedra. In the fourth Pb site, Pb(4) is bonded to one O(14), one O(4), two equivalent O(1), two equivalent O(11), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share  a cornercorner with one Pb(3)O12 cuboctahedra, corners with two equivalent Pb(2)O12 cuboctahedra, corners with four equivalent Pb(4)O12 cuboctahedra, corners with five equivalent Pb(6)O12 cuboctahedra,  a faceface with one Pb(5)O12 cuboctahedra, faces with two equivalent Pb(7)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra,  a faceface with one Nb(2)O6 octahedra,  a faceface with one Nb(3)O6 octahedra,  a faceface with one Co(2)O6 octahedra, faces with two equivalent Co(1)O6 octahedra, and faces with three equivalent Nb(1)O6 octahedra. In the fifth Pb site, Pb(5) is bonded to one O(13), one O(5), two equivalent O(10), two equivalent O(12), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms to form distorted PbO12 cuboctahedra that share corners with three equivalent Pb(1)O12 cuboctahedra, corners with three equivalent Pb(5)O12 cuboctahedra, corners with six equivalent Pb(7)O12 cuboctahedra,  a faceface with one Pb(3)O12 cuboctahedra,  a faceface with one Pb(4)O12 cuboctahedra, faces with two equivalent Pb(2)O12 cuboctahedra, faces with two equivalent Pb(6)O12 cuboctahedra,  a faceface with one Nb(3)O6 octahedra,  a faceface with one Co(2)O6 octahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Nb(4)O6 octahedra, and faces with two equivalent Co(1)O6 octahedra. In the sixth Pb site, Pb(6) is bonded to one O(12), one O(4), two equivalent O(10), two equivalent O(13), two equivalent O(3), two equivalent O(7), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share  a cornercorner with one Pb(2)O12 cuboctahedra, corners with two equivalent Pb(3)O12 cuboctahedra, corners with four equivalent Pb(6)O12 cuboctahedra, corners with five equivalent Pb(4)O12 cuboctahedra,  a faceface with one Pb(7)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra,  a faceface with one Nb(4)O6 octahedra,  a faceface with one Co(1)O6 octahedra, faces with two equivalent Co(2)O6 octahedra, and faces with three equivalent Nb(3)O6 octahedra. In the seventh Pb site, Pb(7) is bonded to one O(11), one O(6), two equivalent O(10), two equivalent O(14), two equivalent O(2), two equivalent O(8), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share corners with three equivalent Pb(1)O12 cuboctahedra, corners with three equivalent Pb(7)O12 cuboctahedra, corners with six equivalent Pb(5)O12 cuboctahedra,  a faceface with one Pb(2)O12 cuboctahedra,  a faceface with one Pb(6)O12 cuboctahedra, faces with two equivalent Pb(3)O12 cuboctahedra, faces with two equivalent Pb(4)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra,  a faceface with one Co(1)O6 octahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Nb(4)O6 octahedra, and faces with two equivalent Co(2)O6 octahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Nb(1), two equivalent Pb(1), and two equivalent Pb(4) atoms. In the second O site, O(2) is bonded in a linear geometry to one Nb(2), one Nb(4), one Pb(2), one Pb(3), one Pb(5), and one Pb(7) atom. In the third O site, O(3) is bonded in a linear geometry to two equivalent Nb(3), two equivalent Pb(1), and two equivalent Pb(6) atoms. In the fourth O site, O(4) is bonded in a linear geometry to one Nb(1), one Nb(3), one Pb(4), one Pb(6), and two equivalent Pb(1) atoms. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Nb(2), two equivalent Pb(2), and two equivalent Pb(5) atoms. In the sixth O site, O(6) is bonded in a linear geometry to two equivalent Nb(4), two equivalent Pb(3), and two equivalent Pb(7) atoms. In the seventh O site, O(7) is bonded in a linear geometry to one Nb(3), one Co(1), one Pb(1), one Pb(4), one Pb(5), and one Pb(6) atom. In the eighth O site, O(8) is bonded in a linear geometry to one Nb(2), one Co(1), one Pb(2), one Pb(4), one Pb(5), and one Pb(7) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Nb(1), one Co(2), one Pb(1), one Pb(4), one Pb(6), and one Pb(7) atom. In the tenth O site, O(10) is bonded in a linear geometry to one Nb(4), one Co(2), one Pb(3), one Pb(5), one Pb(6), and one Pb(7) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one Nb(1), one Co(1), one Pb(1), one Pb(7), and two equivalent Pb(4) atoms. In the twelfth O site, O(12) is bonded in a linear geometry to one Nb(4), one Co(1), one Pb(2), one Pb(6), and two equivalent Pb(5) atoms. In the thirteenth O site, O(13) is bonded in a linear geometry to one Nb(3), one Co(2), one Pb(1), one Pb(5), and two equivalent Pb(6) atoms. In the fourteenth O site, O(14) is bonded in a linear geometry to one Nb(2), one Co(2), one Pb(3), one Pb(4), and two equivalent Pb(7) atoms.
Nb2Co(PbO3)3 crystallizes in the monoclinic C2/m space group. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(11), one O(4), two equivalent O(1), and two equivalent O(9) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a faceface with one Pb(6)O12 cuboctahedra,  a faceface with one Pb(7)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra, and faces with three equivalent Pb(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. The Nb(1)-O(11) bond length is 1.94 Å. The Nb(1)-O(4) bond length is 2.10 Å. Both Nb(1)-O(1) bond lengths are 2.10 Å. Both Nb(1)-O(9) bond lengths are 1.95 Å. In the second Nb site, Nb(2) is bonded to one O(14), one O(5), two equivalent O(2), and two equivalent O(8) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a faceface with one Pb(3)O12 cuboctahedra,  a faceface with one Pb(4)O12 cuboctahedra, faces with two equivalent Pb(2)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, and faces with two equivalent Pb(7)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Nb(2)-O(14) bond length is 1.94 Å. The Nb(2)-O(5) bond length is 2.10 Å. Both Nb(2)-O(2) bond lengths are 2.10 Å. Both Nb(2)-O(8) bond lengths are 1.94 Å. In the third Nb site, Nb(3) is bonded to one O(13), one O(4), two equivalent O(3), and two equivalent O(7) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a faceface with one Pb(4)O12 cuboctahedra,  a faceface with one Pb(5)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra, and faces with three equivalent Pb(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. The Nb(3)-O(13) bond length is 1.94 Å. The Nb(3)-O(4) bond length is 2.10 Å. Both Nb(3)-O(3) bond lengths are 2.10 Å. Both Nb(3)-O(7) bond lengths are 1.94 Å. In the fourth Nb site, Nb(4) is bonded to one O(12), one O(6), two equivalent O(10), and two equivalent O(2) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a faceface with one Pb(2)O12 cuboctahedra,  a faceface with one Pb(6)O12 cuboctahedra, faces with two equivalent Pb(3)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, and faces with two equivalent Pb(7)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. The Nb(4)-O(12) bond length is 1.94 Å. The Nb(4)-O(6) bond length is 2.10 Å. Both Nb(4)-O(10) bond lengths are 1.95 Å. Both Nb(4)-O(2) bond lengths are 2.10 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(11), one O(12), two equivalent O(7), and two equivalent O(8) atoms to form CoO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(4)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra,  a faceface with one Pb(1)O12 cuboctahedra,  a faceface with one Pb(2)O12 cuboctahedra,  a faceface with one Pb(6)O12 cuboctahedra,  a faceface with one Pb(7)O12 cuboctahedra, faces with two equivalent Pb(4)O12 cuboctahedra, and faces with two equivalent Pb(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 3-4°. The Co(1)-O(11) bond length is 2.08 Å. The Co(1)-O(12) bond length is 2.08 Å. Both Co(1)-O(7) bond lengths are 2.08 Å. Both Co(1)-O(8) bond lengths are 2.08 Å. In the second Co site, Co(2) is bonded to one O(13), one O(14), two equivalent O(10), and two equivalent O(9) atoms to form CoO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(4)O6 octahedra,  a faceface with one Pb(1)O12 cuboctahedra,  a faceface with one Pb(3)O12 cuboctahedra,  a faceface with one Pb(4)O12 cuboctahedra,  a faceface with one Pb(5)O12 cuboctahedra, faces with two equivalent Pb(6)O12 cuboctahedra, and faces with two equivalent Pb(7)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. The Co(2)-O(13) bond length is 2.08 Å. The Co(2)-O(14) bond length is 2.08 Å. Both Co(2)-O(10) bond lengths are 2.08 Å. Both Co(2)-O(9) bond lengths are 2.08 Å. There are seven inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to one O(11), one O(13), two equivalent O(1), two equivalent O(3), two equivalent O(4), two equivalent O(7), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share corners with three equivalent Pb(5)O12 cuboctahedra, corners with three equivalent Pb(7)O12 cuboctahedra, corners with six equivalent Pb(1)O12 cuboctahedra, faces with three equivalent Pb(4)O12 cuboctahedra, faces with three equivalent Pb(6)O12 cuboctahedra,  a faceface with one Co(1)O6 octahedra,  a faceface with one Co(2)O6 octahedra, faces with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Nb(3)O6 octahedra. The Pb(1)-O(11) bond length is 2.85 Å. The Pb(1)-O(13) bond length is 2.88 Å. Both Pb(1)-O(1) bond lengths are 2.88 Å. Both Pb(1)-O(3) bond lengths are 2.88 Å. Both Pb(1)-O(4) bond lengths are 2.88 Å. Both Pb(1)-O(7) bond lengths are 2.86 Å. Both Pb(1)-O(9) bond lengths are 2.89 Å. In the second Pb site, Pb(2) is bonded to two equivalent O(12), two equivalent O(5), four equivalent O(2), and four equivalent O(8) atoms to form distorted PbO12 cuboctahedra that share corners with two equivalent Pb(2)O12 cuboctahedra, corners with two equivalent Pb(6)O12 cuboctahedra, corners with four equivalent Pb(3)O12 cuboctahedra, corners with four equivalent Pb(4)O12 cuboctahedra, faces with two equivalent Pb(7)O12 cuboctahedra, faces with four equivalent Pb(5)O12 cuboctahedra, faces with two equivalent Nb(4)O6 octahedra, faces with two equivalent Co(1)O6 octahedra, and faces with four equivalent Nb(2)O6 octahedra. Both Pb(2)-O(12) bond lengths are 2.86 Å. Both Pb(2)-O(5) bond lengths are 2.88 Å. All Pb(2)-O(2) bond lengths are 2.88 Å. All Pb(2)-O(8) bond lengths are 2.87 Å. In the third Pb site, Pb(3) is bonded to two equivalent O(14), two equivalent O(6), four equivalent O(10), and four equivalent O(2) atoms to form distorted PbO12 cuboctahedra that share corners with two equivalent Pb(3)O12 cuboctahedra, corners with two equivalent Pb(4)O12 cuboctahedra, corners with four equivalent Pb(2)O12 cuboctahedra, corners with four equivalent Pb(6)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, faces with four equivalent Pb(7)O12 cuboctahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Co(2)O6 octahedra, and faces with four equivalent Nb(4)O6 octahedra. Both Pb(3)-O(14) bond lengths are 2.87 Å. Both Pb(3)-O(6) bond lengths are 2.88 Å. All Pb(3)-O(10) bond lengths are 2.88 Å. All Pb(3)-O(2) bond lengths are 2.88 Å. In the fourth Pb site, Pb(4) is bonded to one O(14), one O(4), two equivalent O(1), two equivalent O(11), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share  a cornercorner with one Pb(3)O12 cuboctahedra, corners with two equivalent Pb(2)O12 cuboctahedra, corners with four equivalent Pb(4)O12 cuboctahedra, corners with five equivalent Pb(6)O12 cuboctahedra,  a faceface with one Pb(5)O12 cuboctahedra, faces with two equivalent Pb(7)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra,  a faceface with one Nb(2)O6 octahedra,  a faceface with one Nb(3)O6 octahedra,  a faceface with one Co(2)O6 octahedra, faces with two equivalent Co(1)O6 octahedra, and faces with three equivalent Nb(1)O6 octahedra. The Pb(4)-O(14) bond length is 2.90 Å. The Pb(4)-O(4) bond length is 2.90 Å. Both Pb(4)-O(1) bond lengths are 2.90 Å. Both Pb(4)-O(11) bond lengths are 2.88 Å. Both Pb(4)-O(7) bond lengths are 2.88 Å. Both Pb(4)-O(8) bond lengths are 2.90 Å. Both Pb(4)-O(9) bond lengths are 2.88 Å. In the fifth Pb site, Pb(5) is bonded to one O(13), one O(5), two equivalent O(10), two equivalent O(12), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms to form distorted PbO12 cuboctahedra that share corners with three equivalent Pb(1)O12 cuboctahedra, corners with three equivalent Pb(5)O12 cuboctahedra, corners with six equivalent Pb(7)O12 cuboctahedra,  a faceface with one Pb(3)O12 cuboctahedra,  a faceface with one Pb(4)O12 cuboctahedra, faces with two equivalent Pb(2)O12 cuboctahedra, faces with two equivalent Pb(6)O12 cuboctahedra,  a faceface with one Nb(3)O6 octahedra,  a faceface with one Co(2)O6 octahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Nb(4)O6 octahedra, and faces with two equivalent Co(1)O6 octahedra. The Pb(5)-O(13) bond length is 2.90 Å. The Pb(5)-O(5) bond length is 2.89 Å. Both Pb(5)-O(10) bond lengths are 2.88 Å. Both Pb(5)-O(12) bond lengths are 2.88 Å. Both Pb(5)-O(2) bond lengths are 2.90 Å. Both Pb(5)-O(7) bond lengths are 2.90 Å. Both Pb(5)-O(8) bond lengths are 2.87 Å. In the sixth Pb site, Pb(6) is bonded to one O(12), one O(4), two equivalent O(10), two equivalent O(13), two equivalent O(3), two equivalent O(7), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share  a cornercorner with one Pb(2)O12 cuboctahedra, corners with two equivalent Pb(3)O12 cuboctahedra, corners with four equivalent Pb(6)O12 cuboctahedra, corners with five equivalent Pb(4)O12 cuboctahedra,  a faceface with one Pb(7)O12 cuboctahedra, faces with two equivalent Pb(5)O12 cuboctahedra, faces with three equivalent Pb(1)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra,  a faceface with one Nb(4)O6 octahedra,  a faceface with one Co(1)O6 octahedra, faces with two equivalent Co(2)O6 octahedra, and faces with three equivalent Nb(3)O6 octahedra. The Pb(6)-O(12) bond length is 2.92 Å. The Pb(6)-O(4) bond length is 2.88 Å. Both Pb(6)-O(10) bond lengths are 2.90 Å. Both Pb(6)-O(13) bond lengths are 2.88 Å. Both Pb(6)-O(3) bond lengths are 2.89 Å. Both Pb(6)-O(7) bond lengths are 2.90 Å. Both Pb(6)-O(9) bond lengths are 2.87 Å. In the seventh Pb site, Pb(7) is bonded to one O(11), one O(6), two equivalent O(10), two equivalent O(14), two equivalent O(2), two equivalent O(8), and two equivalent O(9) atoms to form distorted PbO12 cuboctahedra that share corners with three equivalent Pb(1)O12 cuboctahedra, corners with three equivalent Pb(7)O12 cuboctahedra, corners with six equivalent Pb(5)O12 cuboctahedra,  a faceface with one Pb(2)O12 cuboctahedra,  a faceface with one Pb(6)O12 cuboctahedra, faces with two equivalent Pb(3)O12 cuboctahedra, faces with two equivalent Pb(4)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra,  a faceface with one Co(1)O6 octahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Nb(4)O6 octahedra, and faces with two equivalent Co(2)O6 octahedra. The Pb(7)-O(11) bond length is 2.92 Å. The Pb(7)-O(6) bond length is 2.88 Å. Both Pb(7)-O(10) bond lengths are 2.87 Å. Both Pb(7)-O(14) bond lengths are 2.88 Å. Both Pb(7)-O(2) bond lengths are 2.89 Å. Both Pb(7)-O(8) bond lengths are 2.90 Å. Both Pb(7)-O(9) bond lengths are 2.90 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Nb(1), two equivalent Pb(1), and two equivalent Pb(4) atoms. In the second O site, O(2) is bonded in a linear geometry to one Nb(2), one Nb(4), one Pb(2), one Pb(3), one Pb(5), and one Pb(7) atom. In the third O site, O(3) is bonded in a linear geometry to two equivalent Nb(3), two equivalent Pb(1), and two equivalent Pb(6) atoms. In the fourth O site, O(4) is bonded in a linear geometry to one Nb(1), one Nb(3), one Pb(4), one Pb(6), and two equivalent Pb(1) atoms. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Nb(2), two equivalent Pb(2), and two equivalent Pb(5) atoms. In the sixth O site, O(6) is bonded in a linear geometry to two equivalent Nb(4), two equivalent Pb(3), and two equivalent Pb(7) atoms. In the seventh O site, O(7) is bonded in a linear geometry to one Nb(3), one Co(1), one Pb(1), one Pb(4), one Pb(5), and one Pb(6) atom. In the eighth O site, O(8) is bonded in a linear geometry to one Nb(2), one Co(1), one Pb(2), one Pb(4), one Pb(5), and one Pb(7) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Nb(1), one Co(2), one Pb(1), one Pb(4), one Pb(6), and one Pb(7) atom. In the tenth O site, O(10) is bonded in a linear geometry to one Nb(4), one Co(2), one Pb(3), one Pb(5), one Pb(6), and one Pb(7) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one Nb(1), one Co(1), one Pb(1), one Pb(7), and two equivalent Pb(4) atoms. In the twelfth O site, O(12) is bonded in a linear geometry to one Nb(4), one Co(1), one Pb(2), one Pb(6), and two equivalent Pb(5) atoms. In the thirteenth O site, O(13) is bonded in a linear geometry to one Nb(3), one Co(2), one Pb(1), one Pb(5), and two equivalent Pb(6) atoms. In the fourteenth O site, O(14) is bonded in a linear geometry to one Nb(2), one Co(2), one Pb(3), one Pb(4), and two equivalent Pb(7) atoms.