Sr4Fe6PbBi7O24 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1,2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(12), two equivalent O(13), and four equivalent O(1) atoms. In the second Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(4); four equivalent O(14,15); and four equivalent O(2) atoms. In the third Sr site, Sr(4) is bonded in a 8-coordinate geometry to four equivalent O(14,15) and four equivalent O(2) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(7), and four equivalent O(1) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(6)O6 octahedra,  a cornercorner with one Bi(1)O6 octahedra, and corners with four equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-19°. In the second Fe site, Fe(2) is bonded to one O(13), one O(8), and four equivalent O(1) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Pb(1)O6 octahedra, and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-19°. In the third Fe site, Fe(3) is bonded to one O(9,10) and four equivalent O(2) atoms to form distorted FeO5 square pyramids that share  a cornercorner with one Fe(5)O6 octahedra and corners with four equivalent Fe(4)O5 square pyramids. The corner-sharing octahedra are not tilted. In the fourth Fe site, Fe(4) is bonded to one O(9,10) and four equivalent O(2) atoms to form distorted FeO5 square pyramids that share  a cornercorner with one Fe(6)O6 octahedra and corners with four equivalent Fe(3)O5 square pyramids. The corner-sharing octahedra are not tilted. In the fifth Fe site, Fe(5) is bonded to one O(8); one O(9,10); and four equivalent O(11) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with four equivalent Fe(6)O6 octahedra, and  a cornercorner with one Fe(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 0-18°. In the sixth Fe site, Fe(6) is bonded to one O(7); one O(9,10); and four equivalent O(11) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with four equivalent Fe(5)O6 octahedra, and  a cornercorner with one Fe(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 0-18°. Pb(1) is bonded to one O(13), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form PbO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with four equivalent Pb(1)O6 octahedra, and edges with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-12°. There are seven inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(12), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form BiO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra, and edges with four equivalent Pb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(14,15); two equivalent O(3); and two equivalent O(4) atoms. In the third Bi site, Bi(3) is bonded in a 1-coordinate geometry to one O(14,15); two equivalent O(3); and two equivalent O(4) atoms. In the fourth Bi site, Bi(4) is bonded in a 8-coordinate geometry to two equivalent O(7), two equivalent O(8), and four equivalent O(1) atoms. In the fifth Bi site, Bi(5) is bonded in a 8-coordinate geometry to two equivalent O(7), two equivalent O(8), and four equivalent O(1) atoms. In the sixth Bi site, Bi(6) is bonded in a 8-coordinate geometry to four equivalent O(11) and four equivalent O(9,10) atoms. In the seventh Bi site, Bi(7) is bonded in a 8-coordinate geometry to four equivalent O(11) and four equivalent O(9,10) atoms. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Sr(1,2); one Fe(1); one Fe(2); one Bi(4); and one Bi(5) atom. In the second O site, O(2) is bonded to one Sr(3), one Sr(4), one Fe(3), and one Fe(4) atom to form distorted OSr2Fe2 trigonal pyramids that share  a cornercorner with one O(4)SrBi4Pb octahedra, corners with four equivalent O(2)Sr2Fe2 trigonal pyramids, and edges with four equivalent O(2)Sr2Fe2 trigonal pyramids. The corner-sharing octahedral tilt angles are 50°. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Bi(1), two equivalent Bi(2), and two equivalent Bi(3) atoms. In the fourth O site, O(4) is bonded to one Sr(3), one Pb(1), two equivalent Bi(2), and two equivalent Bi(3) atoms to form OSrBi4Pb octahedra that share  a cornercorner with one O(13)Sr4FePb octahedra, corners with four equivalent O(4)SrBi4Pb octahedra, and corners with four equivalent O(2)Sr2Fe2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 0-5°. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1,2); two equivalent Pb(1); and two equivalent Bi(1) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1,2); two equivalent Pb(1); and two equivalent Bi(1) atoms. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Fe(1), one Fe(6), two equivalent Bi(4), and two equivalent Bi(5) atoms. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Fe(2), one Fe(5), two equivalent Bi(4), and two equivalent Bi(5) atoms. In the ninth O site, O(9,10) is bonded in a 6-coordinate geometry to one Fe(3), one Fe(5), two equivalent Bi(6), and two equivalent Bi(7) atoms. In the tenth O site, O(11) is bonded in a distorted see-saw-like geometry to one Fe(5), one Fe(6), one Bi(6), and one Bi(7) atom. In the eleventh O site, O(12) is bonded to four equivalent Sr(1,2); one Fe(1); and one Bi(1) atom to form OSr4FeBi octahedra that share corners with four equivalent O(12)Sr4FeBi octahedra and edges with four equivalent O(13)Sr4FePb octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the twelfth O site, O(13) is bonded to four equivalent Sr(1,2); one Fe(2); and one Pb(1) atom to form distorted OSr4FePb octahedra that share  a cornercorner with one O(4)SrBi4Pb octahedra, corners with four equivalent O(13)Sr4FePb octahedra, and edges with four equivalent O(12)Sr4FeBi octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the thirteenth O site, O(14,15) is bonded in a 5-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), and one Bi(3) atom.
Sr4Fe6PbBi7O24 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1,2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(12), two equivalent O(13), and four equivalent O(1) atoms. The Sr(1,2)-O(6) bond length is 2.44 Å. Both Sr(1,2)-O(12) bond lengths are 2.72 Å. Both Sr(1,2)-O(13) bond lengths are 2.72 Å. All Sr(1,2)-O(1) bond lengths are 2.99 Å. In the second Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(4); four equivalent O(14,15); and four equivalent O(2) atoms. The Sr(3)-O(4) bond length is 3.03 Å. All Sr(3)-O(14,15) bond lengths are 2.85 Å. All Sr(3)-O(2) bond lengths are 2.51 Å. In the third Sr site, Sr(4) is bonded in a 8-coordinate geometry to four equivalent O(14,15) and four equivalent O(2) atoms. All Sr(4)-O(14,15) bond lengths are 2.86 Å. All Sr(4)-O(2) bond lengths are 2.48 Å. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(7), and four equivalent O(1) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(6)O6 octahedra,  a cornercorner with one Bi(1)O6 octahedra, and corners with four equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-19°. The Fe(1)-O(12) bond length is 1.98 Å. The Fe(1)-O(7) bond length is 2.29 Å. All Fe(1)-O(1) bond lengths are 1.95 Å. In the second Fe site, Fe(2) is bonded to one O(13), one O(8), and four equivalent O(1) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Pb(1)O6 octahedra, and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-19°. The Fe(2)-O(13) bond length is 1.95 Å. The Fe(2)-O(8) bond length is 2.29 Å. All Fe(2)-O(1) bond lengths are 1.95 Å. In the third Fe site, Fe(3) is bonded to one O(9,10) and four equivalent O(2) atoms to form distorted FeO5 square pyramids that share  a cornercorner with one Fe(5)O6 octahedra and corners with four equivalent Fe(4)O5 square pyramids. The corner-sharing octahedra are not tilted. The Fe(3)-O(9,10) bond length is 1.95 Å. All Fe(3)-O(2) bond lengths are 1.95 Å. In the fourth Fe site, Fe(4) is bonded to one O(9,10) and four equivalent O(2) atoms to form distorted FeO5 square pyramids that share  a cornercorner with one Fe(6)O6 octahedra and corners with four equivalent Fe(3)O5 square pyramids. The corner-sharing octahedra are not tilted. The Fe(4)-O(9,10) bond length is 1.95 Å. All Fe(4)-O(2) bond lengths are 1.95 Å. In the fifth Fe site, Fe(5) is bonded to one O(8); one O(9,10); and four equivalent O(11) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with four equivalent Fe(6)O6 octahedra, and  a cornercorner with one Fe(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 0-18°. The Fe(5)-O(8) bond length is 2.00 Å. The Fe(5)-O(9,10) bond length is 2.21 Å. All Fe(5)-O(11) bond lengths are 1.94 Å. In the sixth Fe site, Fe(6) is bonded to one O(7); one O(9,10); and four equivalent O(11) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with four equivalent Fe(5)O6 octahedra, and  a cornercorner with one Fe(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 0-18°. The Fe(6)-O(7) bond length is 2.00 Å. The Fe(6)-O(9,10) bond length is 2.21 Å. All Fe(6)-O(11) bond lengths are 1.95 Å. Pb(1) is bonded to one O(13), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form PbO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with four equivalent Pb(1)O6 octahedra, and edges with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-12°. The Pb(1)-O(13) bond length is 2.73 Å. The Pb(1)-O(4) bond length is 2.51 Å. Both Pb(1)-O(5) bond lengths are 2.73 Å. Both Pb(1)-O(6) bond lengths are 2.73 Å. There are seven inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(12), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form BiO6 octahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra, and edges with four equivalent Pb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. The Bi(1)-O(12) bond length is 2.66 Å. The Bi(1)-O(3) bond length is 2.32 Å. Both Bi(1)-O(5) bond lengths are 2.73 Å. Both Bi(1)-O(6) bond lengths are 2.73 Å. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(14,15); two equivalent O(3); and two equivalent O(4) atoms. The Bi(2)-O(14,15) bond length is 2.06 Å. Both Bi(2)-O(3) bond lengths are 2.74 Å. Both Bi(2)-O(4) bond lengths are 2.72 Å. In the third Bi site, Bi(3) is bonded in a 1-coordinate geometry to one O(14,15); two equivalent O(3); and two equivalent O(4) atoms. The Bi(3)-O(14,15) bond length is 2.06 Å. Both Bi(3)-O(3) bond lengths are 2.74 Å. Both Bi(3)-O(4) bond lengths are 2.72 Å. In the fourth Bi site, Bi(4) is bonded in a 8-coordinate geometry to two equivalent O(7), two equivalent O(8), and four equivalent O(1) atoms. Both Bi(4)-O(7) bond lengths are 2.75 Å. Both Bi(4)-O(8) bond lengths are 2.75 Å. All Bi(4)-O(1) bond lengths are 2.47 Å. In the fifth Bi site, Bi(5) is bonded in a 8-coordinate geometry to two equivalent O(7), two equivalent O(8), and four equivalent O(1) atoms. Both Bi(5)-O(7) bond lengths are 2.75 Å. Both Bi(5)-O(8) bond lengths are 2.75 Å. All Bi(5)-O(1) bond lengths are 2.47 Å. In the sixth Bi site, Bi(6) is bonded in a 8-coordinate geometry to four equivalent O(11) and four equivalent O(9,10) atoms. All Bi(6)-O(11) bond lengths are 2.45 Å. All Bi(6)-O(9,10) bond lengths are 2.74 Å. In the seventh Bi site, Bi(7) is bonded in a 8-coordinate geometry to four equivalent O(11) and four equivalent O(9,10) atoms. All Bi(7)-O(11) bond lengths are 2.45 Å. All Bi(7)-O(9,10) bond lengths are 2.74 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Sr(1,2); one Fe(1); one Fe(2); one Bi(4); and one Bi(5) atom. In the second O site, O(2) is bonded to one Sr(3), one Sr(4), one Fe(3), and one Fe(4) atom to form distorted OSr2Fe2 trigonal pyramids that share  a cornercorner with one O(4)SrBi4Pb octahedra, corners with four equivalent O(2)Sr2Fe2 trigonal pyramids, and edges with four equivalent O(2)Sr2Fe2 trigonal pyramids. The corner-sharing octahedral tilt angles are 50°. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Bi(1), two equivalent Bi(2), and two equivalent Bi(3) atoms. In the fourth O site, O(4) is bonded to one Sr(3), one Pb(1), two equivalent Bi(2), and two equivalent Bi(3) atoms to form OSrBi4Pb octahedra that share  a cornercorner with one O(13)Sr4FePb octahedra, corners with four equivalent O(4)SrBi4Pb octahedra, and corners with four equivalent O(2)Sr2Fe2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 0-5°. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1,2); two equivalent Pb(1); and two equivalent Bi(1) atoms. The O(5)-Sr(1,2) bond length is 2.44 Å. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1,2); two equivalent Pb(1); and two equivalent Bi(1) atoms. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Fe(1), one Fe(6), two equivalent Bi(4), and two equivalent Bi(5) atoms. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Fe(2), one Fe(5), two equivalent Bi(4), and two equivalent Bi(5) atoms. In the ninth O site, O(9,10) is bonded in a 6-coordinate geometry to one Fe(3), one Fe(5), two equivalent Bi(6), and two equivalent Bi(7) atoms. In the tenth O site, O(11) is bonded in a distorted see-saw-like geometry to one Fe(5), one Fe(6), one Bi(6), and one Bi(7) atom. In the eleventh O site, O(12) is bonded to four equivalent Sr(1,2); one Fe(1); and one Bi(1) atom to form OSr4FeBi octahedra that share corners with four equivalent O(12)Sr4FeBi octahedra and edges with four equivalent O(13)Sr4FePb octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the twelfth O site, O(13) is bonded to four equivalent Sr(1,2); one Fe(2); and one Pb(1) atom to form distorted OSr4FePb octahedra that share  a cornercorner with one O(4)SrBi4Pb octahedra, corners with four equivalent O(13)Sr4FePb octahedra, and edges with four equivalent O(12)Sr4FeBi octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the thirteenth O site, O(14,15) is bonded in a 5-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), and one Bi(3) atom.