Tb2Fe12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 18-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(7), two equivalent Fe(8), two equivalent Fe(9), two equivalent P(4), two equivalent P(5), and two equivalent P(6) atoms. In the second Tb site, Tb(2) is bonded in a 15-coordinate geometry to one Fe(7), one Fe(8), one Fe(9), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. There are twelve inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Tb(1), two equivalent Tb(2), one P(1), one P(3), and two equivalent P(5) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(7)Tb3P4 tetrahedra, corners with two equivalent Fe(8)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with three equivalent Fe(2)Tb3P4 tetrahedra, corners with three equivalent Fe(3)Tb3P4 tetrahedra,  an edgeedge with one Fe(6)TbP4 tetrahedra, edges with two equivalent Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra,  a faceface with one Fe(2)Tb3P4 tetrahedra,  a faceface with one Fe(3)Tb3P4 tetrahedra,  a faceface with one Fe(5)TbP4 tetrahedra, and faces with two equivalent Fe(9)Tb3P4 tetrahedra. In the second Fe site, Fe(2) is bonded to one Tb(1), two equivalent Tb(2), one P(1), one P(2), and two equivalent P(6) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(8)Tb3P4 tetrahedra, corners with two equivalent Fe(9)Tb3P4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra, corners with three equivalent Fe(1)Tb3P4 tetrahedra, corners with three equivalent Fe(3)Tb3P4 tetrahedra,  an edgeedge with one Fe(4)TbP4 tetrahedra, edges with two equivalent Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra,  a faceface with one Fe(1)Tb3P4 tetrahedra,  a faceface with one Fe(3)Tb3P4 tetrahedra,  a faceface with one Fe(6)TbP4 tetrahedra, and faces with two equivalent Fe(7)Tb3P4 tetrahedra. In the third Fe site, Fe(3) is bonded to one Tb(1), two equivalent Tb(2), one P(2), one P(3), and two equivalent P(4) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(7)Tb3P4 tetrahedra, corners with two equivalent Fe(9)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra, corners with three equivalent Fe(1)Tb3P4 tetrahedra, corners with three equivalent Fe(2)Tb3P4 tetrahedra,  an edgeedge with one Fe(5)TbP4 tetrahedra, edges with two equivalent Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra,  a faceface with one Fe(1)Tb3P4 tetrahedra,  a faceface with one Fe(2)Tb3P4 tetrahedra,  a faceface with one Fe(4)TbP4 tetrahedra, and faces with two equivalent Fe(8)Tb3P4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to one Tb(1), one P(1), one P(7), and two equivalent P(4) atoms to form distorted FeTbP4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(9)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra,  an edgeedge with one Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra,  a faceface with one Fe(3)Tb3P4 tetrahedra, and faces with two equivalent Fe(7)Tb3P4 tetrahedra. In the fifth Fe site, Fe(5) is bonded to one Tb(1), one P(2), one P(7), and two equivalent P(5) atoms to form distorted FeTbP4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(7)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra,  an edgeedge with one Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra,  a faceface with one Fe(1)Tb3P4 tetrahedra, and faces with two equivalent Fe(8)Tb3P4 tetrahedra. In the sixth Fe site, Fe(6) is bonded to one Tb(1), one P(3), one P(7), and two equivalent P(6) atoms to form distorted FeTbP4 tetrahedra that share corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(8)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra,  an edgeedge with one Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra,  a faceface with one Fe(2)Tb3P4 tetrahedra, and faces with two equivalent Fe(9)Tb3P4 tetrahedra. In the seventh Fe site, Fe(7) is bonded to one Tb(2), two equivalent Tb(1), one P(4), one P(6), and two equivalent P(1) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with three equivalent Fe(8)Tb3P4 tetrahedra, corners with three equivalent Fe(9)Tb3P4 tetrahedra, edges with two equivalent Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra, edges with two equivalent Fe(6)TbP4 tetrahedra,  a faceface with one Fe(8)Tb3P4 tetrahedra,  a faceface with one Fe(9)Tb3P4 tetrahedra, faces with two equivalent Fe(2)Tb3P4 tetrahedra, and faces with two equivalent Fe(4)TbP4 tetrahedra. In the eighth Fe site, Fe(8) is bonded to one Tb(2), two equivalent Tb(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra, corners with three equivalent Fe(7)Tb3P4 tetrahedra, corners with three equivalent Fe(9)Tb3P4 tetrahedra, edges with two equivalent Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra, edges with two equivalent Fe(4)TbP4 tetrahedra,  a faceface with one Fe(7)Tb3P4 tetrahedra,  a faceface with one Fe(9)Tb3P4 tetrahedra, faces with two equivalent Fe(3)Tb3P4 tetrahedra, and faces with two equivalent Fe(5)TbP4 tetrahedra. In the ninth Fe site, Fe(9) is bonded to one Tb(2), two equivalent Tb(1), one P(5), one P(6), and two equivalent P(3) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with three equivalent Fe(7)Tb3P4 tetrahedra, corners with three equivalent Fe(8)Tb3P4 tetrahedra, edges with two equivalent Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra, edges with two equivalent Fe(5)TbP4 tetrahedra,  a faceface with one Fe(7)Tb3P4 tetrahedra,  a faceface with one Fe(8)Tb3P4 tetrahedra, faces with two equivalent Fe(1)Tb3P4 tetrahedra, and faces with two equivalent Fe(6)TbP4 tetrahedra. In the tenth Fe site, Fe(10) is bonded in a 5-coordinate geometry to one P(5), two equivalent P(1), and two equivalent P(7) atoms. In the eleventh Fe site, Fe(11) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(2), and two equivalent P(7) atoms. In the twelfth Fe site, Fe(12) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(3), and two equivalent P(7) atoms. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Fe(1), one Fe(2), one Fe(4), two equivalent Fe(10), and two equivalent Fe(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Fe(2), one Fe(3), one Fe(5), two equivalent Fe(11), and two equivalent Fe(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Fe(1), one Fe(3), one Fe(6), two equivalent Fe(12), and two equivalent Fe(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Fe(12), one Fe(7), one Fe(8), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Fe(10), one Fe(8), one Fe(9), two equivalent Fe(1), and two equivalent Fe(5) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Fe(11), one Fe(7), one Fe(9), two equivalent Fe(2), and two equivalent Fe(6) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(12) atoms.
Tb2Fe12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 18-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(7), two equivalent Fe(8), two equivalent Fe(9), two equivalent P(4), two equivalent P(5), and two equivalent P(6) atoms. The Tb(1)-Fe(1) bond length is 3.15 Å. The Tb(1)-Fe(2) bond length is 3.15 Å. The Tb(1)-Fe(3) bond length is 3.15 Å. The Tb(1)-Fe(4) bond length is 3.05 Å. The Tb(1)-Fe(5) bond length is 3.05 Å. The Tb(1)-Fe(6) bond length is 3.05 Å. Both Tb(1)-Fe(7) bond lengths are 2.99 Å. Both Tb(1)-Fe(8) bond lengths are 2.98 Å. Both Tb(1)-Fe(9) bond lengths are 2.99 Å. Both Tb(1)-P(4) bond lengths are 2.87 Å. Both Tb(1)-P(5) bond lengths are 2.87 Å. Both Tb(1)-P(6) bond lengths are 2.87 Å. In the second Tb site, Tb(2) is bonded in a 15-coordinate geometry to one Fe(7), one Fe(8), one Fe(9), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. The Tb(2)-Fe(7) bond length is 3.08 Å. The Tb(2)-Fe(8) bond length is 3.08 Å. The Tb(2)-Fe(9) bond length is 3.08 Å. Both Tb(2)-Fe(1) bond lengths are 2.96 Å. Both Tb(2)-Fe(2) bond lengths are 2.96 Å. Both Tb(2)-Fe(3) bond lengths are 2.96 Å. Both Tb(2)-P(1) bond lengths are 2.83 Å. Both Tb(2)-P(2) bond lengths are 2.83 Å. Both Tb(2)-P(3) bond lengths are 2.83 Å. There are twelve inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Tb(1), two equivalent Tb(2), one P(1), one P(3), and two equivalent P(5) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(7)Tb3P4 tetrahedra, corners with two equivalent Fe(8)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with three equivalent Fe(2)Tb3P4 tetrahedra, corners with three equivalent Fe(3)Tb3P4 tetrahedra,  an edgeedge with one Fe(6)TbP4 tetrahedra, edges with two equivalent Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra,  a faceface with one Fe(2)Tb3P4 tetrahedra,  a faceface with one Fe(3)Tb3P4 tetrahedra,  a faceface with one Fe(5)TbP4 tetrahedra, and faces with two equivalent Fe(9)Tb3P4 tetrahedra. The Fe(1)-P(1) bond length is 2.25 Å. The Fe(1)-P(3) bond length is 2.26 Å. Both Fe(1)-P(5) bond lengths are 2.29 Å. In the second Fe site, Fe(2) is bonded to one Tb(1), two equivalent Tb(2), one P(1), one P(2), and two equivalent P(6) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(8)Tb3P4 tetrahedra, corners with two equivalent Fe(9)Tb3P4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra, corners with three equivalent Fe(1)Tb3P4 tetrahedra, corners with three equivalent Fe(3)Tb3P4 tetrahedra,  an edgeedge with one Fe(4)TbP4 tetrahedra, edges with two equivalent Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra,  a faceface with one Fe(1)Tb3P4 tetrahedra,  a faceface with one Fe(3)Tb3P4 tetrahedra,  a faceface with one Fe(6)TbP4 tetrahedra, and faces with two equivalent Fe(7)Tb3P4 tetrahedra. The Fe(2)-P(1) bond length is 2.27 Å. The Fe(2)-P(2) bond length is 2.25 Å. Both Fe(2)-P(6) bond lengths are 2.28 Å. In the third Fe site, Fe(3) is bonded to one Tb(1), two equivalent Tb(2), one P(2), one P(3), and two equivalent P(4) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(7)Tb3P4 tetrahedra, corners with two equivalent Fe(9)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra, corners with three equivalent Fe(1)Tb3P4 tetrahedra, corners with three equivalent Fe(2)Tb3P4 tetrahedra,  an edgeedge with one Fe(5)TbP4 tetrahedra, edges with two equivalent Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra,  a faceface with one Fe(1)Tb3P4 tetrahedra,  a faceface with one Fe(2)Tb3P4 tetrahedra,  a faceface with one Fe(4)TbP4 tetrahedra, and faces with two equivalent Fe(8)Tb3P4 tetrahedra. The Fe(3)-P(2) bond length is 2.27 Å. The Fe(3)-P(3) bond length is 2.25 Å. Both Fe(3)-P(4) bond lengths are 2.28 Å. In the fourth Fe site, Fe(4) is bonded to one Tb(1), one P(1), one P(7), and two equivalent P(4) atoms to form distorted FeTbP4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(9)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra,  an edgeedge with one Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra,  a faceface with one Fe(3)Tb3P4 tetrahedra, and faces with two equivalent Fe(7)Tb3P4 tetrahedra. The Fe(4)-P(1) bond length is 2.19 Å. The Fe(4)-P(7) bond length is 2.14 Å. Both Fe(4)-P(4) bond lengths are 2.28 Å. In the fifth Fe site, Fe(5) is bonded to one Tb(1), one P(2), one P(7), and two equivalent P(5) atoms to form distorted FeTbP4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(7)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra,  an edgeedge with one Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra,  a faceface with one Fe(1)Tb3P4 tetrahedra, and faces with two equivalent Fe(8)Tb3P4 tetrahedra. The Fe(5)-P(2) bond length is 2.19 Å. The Fe(5)-P(7) bond length is 2.14 Å. Both Fe(5)-P(5) bond lengths are 2.28 Å. In the sixth Fe site, Fe(6) is bonded to one Tb(1), one P(3), one P(7), and two equivalent P(6) atoms to form distorted FeTbP4 tetrahedra that share corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(8)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra,  an edgeedge with one Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra,  a faceface with one Fe(2)Tb3P4 tetrahedra, and faces with two equivalent Fe(9)Tb3P4 tetrahedra. The Fe(6)-P(3) bond length is 2.19 Å. The Fe(6)-P(7) bond length is 2.14 Å. Both Fe(6)-P(6) bond lengths are 2.28 Å. In the seventh Fe site, Fe(7) is bonded to one Tb(2), two equivalent Tb(1), one P(4), one P(6), and two equivalent P(1) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(5)TbP4 tetrahedra, corners with three equivalent Fe(8)Tb3P4 tetrahedra, corners with three equivalent Fe(9)Tb3P4 tetrahedra, edges with two equivalent Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(7)Tb3P4 tetrahedra, edges with two equivalent Fe(6)TbP4 tetrahedra,  a faceface with one Fe(8)Tb3P4 tetrahedra,  a faceface with one Fe(9)Tb3P4 tetrahedra, faces with two equivalent Fe(2)Tb3P4 tetrahedra, and faces with two equivalent Fe(4)TbP4 tetrahedra. The Fe(7)-P(4) bond length is 2.32 Å. The Fe(7)-P(6) bond length is 2.27 Å. Both Fe(7)-P(1) bond lengths are 2.26 Å. In the eighth Fe site, Fe(8) is bonded to one Tb(2), two equivalent Tb(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(1)Tb3P4 tetrahedra, corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(6)TbP4 tetrahedra, corners with three equivalent Fe(7)Tb3P4 tetrahedra, corners with three equivalent Fe(9)Tb3P4 tetrahedra, edges with two equivalent Fe(1)Tb3P4 tetrahedra, edges with two equivalent Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(8)Tb3P4 tetrahedra, edges with two equivalent Fe(4)TbP4 tetrahedra,  a faceface with one Fe(7)Tb3P4 tetrahedra,  a faceface with one Fe(9)Tb3P4 tetrahedra, faces with two equivalent Fe(3)Tb3P4 tetrahedra, and faces with two equivalent Fe(5)TbP4 tetrahedra. The Fe(8)-P(4) bond length is 2.27 Å. The Fe(8)-P(5) bond length is 2.32 Å. Both Fe(8)-P(2) bond lengths are 2.26 Å. In the ninth Fe site, Fe(9) is bonded to one Tb(2), two equivalent Tb(1), one P(5), one P(6), and two equivalent P(3) atoms to form distorted FeTb3P4 tetrahedra that share corners with two equivalent Fe(2)Tb3P4 tetrahedra, corners with two equivalent Fe(3)Tb3P4 tetrahedra, corners with two equivalent Fe(4)TbP4 tetrahedra, corners with three equivalent Fe(7)Tb3P4 tetrahedra, corners with three equivalent Fe(8)Tb3P4 tetrahedra, edges with two equivalent Fe(2)Tb3P4 tetrahedra, edges with two equivalent Fe(3)Tb3P4 tetrahedra, edges with two equivalent Fe(9)Tb3P4 tetrahedra, edges with two equivalent Fe(5)TbP4 tetrahedra,  a faceface with one Fe(7)Tb3P4 tetrahedra,  a faceface with one Fe(8)Tb3P4 tetrahedra, faces with two equivalent Fe(1)Tb3P4 tetrahedra, and faces with two equivalent Fe(6)TbP4 tetrahedra. The Fe(9)-P(5) bond length is 2.27 Å. The Fe(9)-P(6) bond length is 2.32 Å. Both Fe(9)-P(3) bond lengths are 2.26 Å. In the tenth Fe site, Fe(10) is bonded in a 5-coordinate geometry to one P(5), two equivalent P(1), and two equivalent P(7) atoms. The Fe(10)-P(5) bond length is 2.26 Å. Both Fe(10)-P(1) bond lengths are 2.53 Å. Both Fe(10)-P(7) bond lengths are 2.48 Å. In the eleventh Fe site, Fe(11) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(2), and two equivalent P(7) atoms. The Fe(11)-P(6) bond length is 2.26 Å. Both Fe(11)-P(2) bond lengths are 2.53 Å. Both Fe(11)-P(7) bond lengths are 2.48 Å. In the twelfth Fe site, Fe(12) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(3), and two equivalent P(7) atoms. The Fe(12)-P(4) bond length is 2.26 Å. Both Fe(12)-P(3) bond lengths are 2.52 Å. Both Fe(12)-P(7) bond lengths are 2.48 Å. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Fe(1), one Fe(2), one Fe(4), two equivalent Fe(10), and two equivalent Fe(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Fe(2), one Fe(3), one Fe(5), two equivalent Fe(11), and two equivalent Fe(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Fe(1), one Fe(3), one Fe(6), two equivalent Fe(12), and two equivalent Fe(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Fe(12), one Fe(7), one Fe(8), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Fe(10), one Fe(8), one Fe(9), two equivalent Fe(1), and two equivalent Fe(5) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Fe(11), one Fe(7), one Fe(9), two equivalent Fe(2), and two equivalent Fe(6) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to one Fe(4), one Fe(5), one Fe(6), two equivalent Fe(10), two equivalent Fe(11), and two equivalent Fe(12) atoms.