Sc4TaFe19P12 crystallizes in the monoclinic Pm space group. There are four inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 6-coordinate geometry to two equivalent P(11), two equivalent P(3), and two equivalent P(8) atoms. In the second Sc site, Sc(2) is bonded in a 6-coordinate geometry to two equivalent P(12), two equivalent P(4), and two equivalent P(7) atoms. In the third Sc site, Sc(3) is bonded in a 6-coordinate geometry to two equivalent P(1), two equivalent P(6), and two equivalent P(9) atoms. In the fourth Sc site, Sc(4) is bonded in a 6-coordinate geometry to two equivalent P(10), two equivalent P(2), and two equivalent P(5) atoms. Ta(1) is bonded in a 13-coordinate geometry to one Fe(13), one Fe(6), two equivalent Fe(12), two equivalent Fe(15), two equivalent Fe(3), one P(10), two equivalent P(3), and two equivalent P(7) atoms. There are nineteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one P(1), one P(6), and two equivalent P(12) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(14)P4 tetrahedra,  a cornercorner with one Fe(9)P4 tetrahedra,  a cornercorner with one Fe(6)TaP4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(12)Ta2P4 tetrahedra, corners with two equivalent Fe(15)Ta2P4 tetrahedra,  an edgeedge with one Fe(10)P4 tetrahedra, and edges with two equivalent Fe(7)P4 tetrahedra. In the second Fe site, Fe(2) is bonded to one P(2), one P(5), and two equivalent P(11) atoms to form a mixture of distorted corner and edge-sharing FeP4 tetrahedra. In the third Fe site, Fe(3) is bonded in a 4-coordinate geometry to two equivalent Ta(1), one P(3), one P(8), and two equivalent P(10) atoms. In the fourth Fe site, Fe(4) is bonded to one P(4), one P(7), and two equivalent P(9) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(16)P4 tetrahedra,  a cornercorner with one Fe(7)P4 tetrahedra,  a cornercorner with one Fe(12)Ta2P4 tetrahedra,  a cornercorner with one Fe(15)Ta2P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(14)P4 tetrahedra, corners with two equivalent Fe(4)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra,  an edgeedge with one Fe(11)P4 tetrahedra, and edges with two equivalent Fe(6)TaP4 tetrahedra. In the fifth Fe site, Fe(5) is bonded to one P(10), one P(2), and two equivalent P(8) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(10)P4 tetrahedra,  a cornercorner with one Fe(14)P4 tetrahedra,  a cornercorner with one Fe(2)P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(5)P4 tetrahedra, corners with two equivalent Fe(12)Ta2P4 tetrahedra, and edges with two equivalent Fe(16)P4 tetrahedra. In the sixth Fe site, Fe(6) is bonded to one Ta(1), one P(1), one P(9), and two equivalent P(7) atoms to form distorted FeTaP4 tetrahedra that share  a cornercorner with one Fe(1)P4 tetrahedra,  a cornercorner with one Fe(9)P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(6)TaP4 tetrahedra, edges with two equivalent Fe(4)P4 tetrahedra, edges with two equivalent Fe(12)Ta2P4 tetrahedra, and faces with two equivalent Fe(15)Ta2P4 tetrahedra. In the seventh Fe site, Fe(7) is bonded to one P(12), one P(4), and two equivalent P(6) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(16)P4 tetrahedra,  a cornercorner with one Fe(4)P4 tetrahedra,  a cornercorner with one Fe(12)Ta2P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(7)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra, edges with two equivalent Fe(1)P4 tetrahedra, and edges with two equivalent Fe(14)P4 tetrahedra. In the eighth Fe site, Fe(8) is bonded to one P(11), one P(3), and two equivalent P(5) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(11)P4 tetrahedra,  a cornercorner with one Fe(15)Ta2P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(8)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra, and edges with two equivalent Fe(2)P4 tetrahedra. In the ninth Fe site, Fe(9) is bonded to one P(6), one P(9), and two equivalent P(11) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(1)P4 tetrahedra,  a cornercorner with one Fe(14)P4 tetrahedra,  a cornercorner with one Fe(6)TaP4 tetrahedra, corners with two equivalent Fe(2)P4 tetrahedra, corners with two equivalent Fe(4)P4 tetrahedra, corners with two equivalent Fe(7)P4 tetrahedra, corners with two equivalent Fe(8)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra,  an edgeedge with one Fe(2)P4 tetrahedra, and edges with two equivalent Fe(11)P4 tetrahedra. In the tenth Fe site, Fe(10) is bonded to one P(10), one P(5), and two equivalent P(12) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(2)P4 tetrahedra,  a cornercorner with one Fe(5)P4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(7)P4 tetrahedra, corners with two equivalent Fe(8)P4 tetrahedra,  an edgeedge with one Fe(1)P4 tetrahedra, and edges with two equivalent Fe(12)Ta2P4 tetrahedra. In the eleventh Fe site, Fe(11) is bonded to one P(11), one P(8), and two equivalent P(9) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(16)P4 tetrahedra,  a cornercorner with one Fe(8)P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(2)P4 tetrahedra, corners with two equivalent Fe(4)P4 tetrahedra, corners with two equivalent Fe(5)P4 tetrahedra, corners with two equivalent Fe(6)TaP4 tetrahedra,  an edgeedge with one Fe(4)P4 tetrahedra, and edges with two equivalent Fe(9)P4 tetrahedra. In the twelfth Fe site, Fe(12) is bonded to two equivalent Ta(1), one P(12), one P(7), and two equivalent P(10) atoms to form distorted FeTa2P4 tetrahedra that share  a cornercorner with one Fe(4)P4 tetrahedra,  a cornercorner with one Fe(7)P4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(5)P4 tetrahedra, corners with two equivalent Fe(15)Ta2P4 tetrahedra, edges with two equivalent Fe(10)P4 tetrahedra, edges with two equivalent Fe(12)Ta2P4 tetrahedra, edges with two equivalent Fe(6)TaP4 tetrahedra, and  a faceface with one Fe(15)Ta2P4 tetrahedra. In the thirteenth Fe site, Fe(13) is bonded in a 4-coordinate geometry to one Ta(1), one P(1), one P(5), and two equivalent P(3) atoms. In the fourteenth Fe site, Fe(14) is bonded to one P(2), one P(6), and two equivalent P(4) atoms to form a mixture of distorted corner and edge-sharing FeP4 tetrahedra. In the fifteenth Fe site, Fe(15) is bonded to two equivalent Ta(1), one P(3), one P(7), and two equivalent P(1) atoms to form distorted FeTa2P4 tetrahedra that share  a cornercorner with one Fe(4)P4 tetrahedra,  a cornercorner with one Fe(8)P4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(12)Ta2P4 tetrahedra, edges with two equivalent Fe(15)Ta2P4 tetrahedra,  a faceface with one Fe(12)Ta2P4 tetrahedra, and faces with two equivalent Fe(6)TaP4 tetrahedra. In the sixteenth Fe site, Fe(16) is bonded to one P(4), one P(8), and two equivalent P(2) atoms to form a mixture of distorted corner and edge-sharing FeP4 tetrahedra. In the seventeenth Fe site, Fe(17) is bonded in a 5-coordinate geometry to one P(9), two equivalent P(4), and two equivalent P(8) atoms. In the eighteenth Fe site, Fe(18) is bonded in a 5-coordinate geometry to one P(12), two equivalent P(1), and two equivalent P(5) atoms. In the nineteenth Fe site, Fe(19) is bonded in a 5-coordinate geometry to one P(11), two equivalent P(2), and two equivalent P(6) atoms. There are twelve inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Sc(3), one Fe(1), one Fe(13), one Fe(6), two equivalent Fe(15), and two equivalent Fe(18) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Sc(4), one Fe(14), one Fe(2), one Fe(5), two equivalent Fe(16), and two equivalent Fe(19) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Sc(1), two equivalent Ta(1), one Fe(15), one Fe(3), one Fe(8), and two equivalent Fe(13) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Sc(2), one Fe(16), one Fe(4), one Fe(7), two equivalent Fe(14), and two equivalent Fe(17) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Sc(4), one Fe(10), one Fe(13), one Fe(2), two equivalent Fe(18), and two equivalent Fe(8) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Sc(3), one Fe(1), one Fe(14), one Fe(9), two equivalent Fe(19), and two equivalent Fe(7) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to two equivalent Sc(2), two equivalent Ta(1), one Fe(12), one Fe(15), one Fe(4), and two equivalent Fe(6) atoms. In the eighth P site, P(8) is bonded in a 9-coordinate geometry to two equivalent Sc(1), one Fe(11), one Fe(16), one Fe(3), two equivalent Fe(17), and two equivalent Fe(5) atoms. In the ninth P site, P(9) is bonded in a 9-coordinate geometry to two equivalent Sc(3), one Fe(17), one Fe(6), one Fe(9), two equivalent Fe(11), and two equivalent Fe(4) atoms. In the tenth P site, P(10) is bonded in a 9-coordinate geometry to two equivalent Sc(4), one Ta(1), one Fe(10), one Fe(5), two equivalent Fe(12), and two equivalent Fe(3) atoms. In the eleventh P site, P(11) is bonded in a 9-coordinate geometry to two equivalent Sc(1), one Fe(11), one Fe(19), one Fe(8), two equivalent Fe(2), and two equivalent Fe(9) atoms. In the twelfth P site, P(12) is bonded in a 9-coordinate geometry to two equivalent Sc(2), one Fe(12), one Fe(18), one Fe(7), two equivalent Fe(1), and two equivalent Fe(10) atoms.
Sc4TaFe19P12 crystallizes in the monoclinic Pm space group. There are four inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 6-coordinate geometry to two equivalent P(11), two equivalent P(3), and two equivalent P(8) atoms. Both Sc(1)-P(11) bond lengths are 2.81 Å. Both Sc(1)-P(3) bond lengths are 2.74 Å. Both Sc(1)-P(8) bond lengths are 2.74 Å. In the second Sc site, Sc(2) is bonded in a 6-coordinate geometry to two equivalent P(12), two equivalent P(4), and two equivalent P(7) atoms. Both Sc(2)-P(12) bond lengths are 2.84 Å. Both Sc(2)-P(4) bond lengths are 2.76 Å. Both Sc(2)-P(7) bond lengths are 2.71 Å. In the third Sc site, Sc(3) is bonded in a 6-coordinate geometry to two equivalent P(1), two equivalent P(6), and two equivalent P(9) atoms. Both Sc(3)-P(1) bond lengths are 2.76 Å. Both Sc(3)-P(6) bond lengths are 2.73 Å. Both Sc(3)-P(9) bond lengths are 2.80 Å. In the fourth Sc site, Sc(4) is bonded in a 6-coordinate geometry to two equivalent P(10), two equivalent P(2), and two equivalent P(5) atoms. Both Sc(4)-P(10) bond lengths are 2.71 Å. Both Sc(4)-P(2) bond lengths are 2.76 Å. Both Sc(4)-P(5) bond lengths are 2.70 Å. Ta(1) is bonded in a 13-coordinate geometry to one Fe(13), one Fe(6), two equivalent Fe(12), two equivalent Fe(15), two equivalent Fe(3), one P(10), two equivalent P(3), and two equivalent P(7) atoms. The Ta(1)-Fe(13) bond length is 2.61 Å. The Ta(1)-Fe(6) bond length is 2.66 Å. Both Ta(1)-Fe(12) bond lengths are 2.78 Å. Both Ta(1)-Fe(15) bond lengths are 2.68 Å. Both Ta(1)-Fe(3) bond lengths are 2.81 Å. The Ta(1)-P(10) bond length is 2.49 Å. Both Ta(1)-P(3) bond lengths are 2.61 Å. Both Ta(1)-P(7) bond lengths are 2.57 Å. There are nineteen inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one P(1), one P(6), and two equivalent P(12) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(14)P4 tetrahedra,  a cornercorner with one Fe(9)P4 tetrahedra,  a cornercorner with one Fe(6)TaP4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(12)Ta2P4 tetrahedra, corners with two equivalent Fe(15)Ta2P4 tetrahedra,  an edgeedge with one Fe(10)P4 tetrahedra, and edges with two equivalent Fe(7)P4 tetrahedra. The Fe(1)-P(1) bond length is 2.18 Å. The Fe(1)-P(6) bond length is 2.28 Å. Both Fe(1)-P(12) bond lengths are 2.33 Å. In the second Fe site, Fe(2) is bonded to one P(2), one P(5), and two equivalent P(11) atoms to form a mixture of distorted corner and edge-sharing FeP4 tetrahedra. The Fe(2)-P(2) bond length is 2.15 Å. The Fe(2)-P(5) bond length is 2.25 Å. Both Fe(2)-P(11) bond lengths are 2.32 Å. In the third Fe site, Fe(3) is bonded in a 4-coordinate geometry to two equivalent Ta(1), one P(3), one P(8), and two equivalent P(10) atoms. The Fe(3)-P(3) bond length is 2.29 Å. The Fe(3)-P(8) bond length is 2.28 Å. Both Fe(3)-P(10) bond lengths are 2.41 Å. In the fourth Fe site, Fe(4) is bonded to one P(4), one P(7), and two equivalent P(9) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(16)P4 tetrahedra,  a cornercorner with one Fe(7)P4 tetrahedra,  a cornercorner with one Fe(12)Ta2P4 tetrahedra,  a cornercorner with one Fe(15)Ta2P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(14)P4 tetrahedra, corners with two equivalent Fe(4)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra,  an edgeedge with one Fe(11)P4 tetrahedra, and edges with two equivalent Fe(6)TaP4 tetrahedra. The Fe(4)-P(4) bond length is 2.15 Å. The Fe(4)-P(7) bond length is 2.20 Å. Both Fe(4)-P(9) bond lengths are 2.31 Å. In the fifth Fe site, Fe(5) is bonded to one P(10), one P(2), and two equivalent P(8) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(10)P4 tetrahedra,  a cornercorner with one Fe(14)P4 tetrahedra,  a cornercorner with one Fe(2)P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(5)P4 tetrahedra, corners with two equivalent Fe(12)Ta2P4 tetrahedra, and edges with two equivalent Fe(16)P4 tetrahedra. The Fe(5)-P(10) bond length is 2.26 Å. The Fe(5)-P(2) bond length is 2.29 Å. Both Fe(5)-P(8) bond lengths are 2.33 Å. In the sixth Fe site, Fe(6) is bonded to one Ta(1), one P(1), one P(9), and two equivalent P(7) atoms to form distorted FeTaP4 tetrahedra that share  a cornercorner with one Fe(1)P4 tetrahedra,  a cornercorner with one Fe(9)P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(6)TaP4 tetrahedra, edges with two equivalent Fe(4)P4 tetrahedra, edges with two equivalent Fe(12)Ta2P4 tetrahedra, and faces with two equivalent Fe(15)Ta2P4 tetrahedra. The Fe(6)-P(1) bond length is 2.28 Å. The Fe(6)-P(9) bond length is 2.24 Å. Both Fe(6)-P(7) bond lengths are 2.26 Å. In the seventh Fe site, Fe(7) is bonded to one P(12), one P(4), and two equivalent P(6) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(16)P4 tetrahedra,  a cornercorner with one Fe(4)P4 tetrahedra,  a cornercorner with one Fe(12)Ta2P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(7)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra, edges with two equivalent Fe(1)P4 tetrahedra, and edges with two equivalent Fe(14)P4 tetrahedra. The Fe(7)-P(12) bond length is 2.28 Å. The Fe(7)-P(4) bond length is 2.30 Å. Both Fe(7)-P(6) bond lengths are 2.32 Å. In the eighth Fe site, Fe(8) is bonded to one P(11), one P(3), and two equivalent P(5) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(11)P4 tetrahedra,  a cornercorner with one Fe(15)Ta2P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(8)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra, and edges with two equivalent Fe(2)P4 tetrahedra. The Fe(8)-P(11) bond length is 2.25 Å. The Fe(8)-P(3) bond length is 2.21 Å. Both Fe(8)-P(5) bond lengths are 2.28 Å. In the ninth Fe site, Fe(9) is bonded to one P(6), one P(9), and two equivalent P(11) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(1)P4 tetrahedra,  a cornercorner with one Fe(14)P4 tetrahedra,  a cornercorner with one Fe(6)TaP4 tetrahedra, corners with two equivalent Fe(2)P4 tetrahedra, corners with two equivalent Fe(4)P4 tetrahedra, corners with two equivalent Fe(7)P4 tetrahedra, corners with two equivalent Fe(8)P4 tetrahedra, corners with two equivalent Fe(9)P4 tetrahedra,  an edgeedge with one Fe(2)P4 tetrahedra, and edges with two equivalent Fe(11)P4 tetrahedra. The Fe(9)-P(6) bond length is 2.20 Å. The Fe(9)-P(9) bond length is 2.26 Å. Both Fe(9)-P(11) bond lengths are 2.28 Å. In the tenth Fe site, Fe(10) is bonded to one P(10), one P(5), and two equivalent P(12) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(2)P4 tetrahedra,  a cornercorner with one Fe(5)P4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(10)P4 tetrahedra, corners with two equivalent Fe(7)P4 tetrahedra, corners with two equivalent Fe(8)P4 tetrahedra,  an edgeedge with one Fe(1)P4 tetrahedra, and edges with two equivalent Fe(12)Ta2P4 tetrahedra. The Fe(10)-P(10) bond length is 2.19 Å. The Fe(10)-P(5) bond length is 2.20 Å. Both Fe(10)-P(12) bond lengths are 2.27 Å. In the eleventh Fe site, Fe(11) is bonded to one P(11), one P(8), and two equivalent P(9) atoms to form distorted FeP4 tetrahedra that share  a cornercorner with one Fe(16)P4 tetrahedra,  a cornercorner with one Fe(8)P4 tetrahedra, corners with two equivalent Fe(11)P4 tetrahedra, corners with two equivalent Fe(2)P4 tetrahedra, corners with two equivalent Fe(4)P4 tetrahedra, corners with two equivalent Fe(5)P4 tetrahedra, corners with two equivalent Fe(6)TaP4 tetrahedra,  an edgeedge with one Fe(4)P4 tetrahedra, and edges with two equivalent Fe(9)P4 tetrahedra. The Fe(11)-P(11) bond length is 2.26 Å. The Fe(11)-P(8) bond length is 2.18 Å. Both Fe(11)-P(9) bond lengths are 2.28 Å. In the twelfth Fe site, Fe(12) is bonded to two equivalent Ta(1), one P(12), one P(7), and two equivalent P(10) atoms to form distorted FeTa2P4 tetrahedra that share  a cornercorner with one Fe(4)P4 tetrahedra,  a cornercorner with one Fe(7)P4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(5)P4 tetrahedra, corners with two equivalent Fe(15)Ta2P4 tetrahedra, edges with two equivalent Fe(10)P4 tetrahedra, edges with two equivalent Fe(12)Ta2P4 tetrahedra, edges with two equivalent Fe(6)TaP4 tetrahedra, and  a faceface with one Fe(15)Ta2P4 tetrahedra. The Fe(12)-P(12) bond length is 2.26 Å. The Fe(12)-P(7) bond length is 2.36 Å. Both Fe(12)-P(10) bond lengths are 2.31 Å. In the thirteenth Fe site, Fe(13) is bonded in a 4-coordinate geometry to one Ta(1), one P(1), one P(5), and two equivalent P(3) atoms. The Fe(13)-P(1) bond length is 2.19 Å. The Fe(13)-P(5) bond length is 2.16 Å. Both Fe(13)-P(3) bond lengths are 2.23 Å. In the fourteenth Fe site, Fe(14) is bonded to one P(2), one P(6), and two equivalent P(4) atoms to form a mixture of distorted corner and edge-sharing FeP4 tetrahedra. The Fe(14)-P(2) bond length is 2.18 Å. The Fe(14)-P(6) bond length is 2.17 Å. Both Fe(14)-P(4) bond lengths are 2.23 Å. In the fifteenth Fe site, Fe(15) is bonded to two equivalent Ta(1), one P(3), one P(7), and two equivalent P(1) atoms to form distorted FeTa2P4 tetrahedra that share  a cornercorner with one Fe(4)P4 tetrahedra,  a cornercorner with one Fe(8)P4 tetrahedra, corners with two equivalent Fe(1)P4 tetrahedra, corners with two equivalent Fe(12)Ta2P4 tetrahedra, edges with two equivalent Fe(15)Ta2P4 tetrahedra,  a faceface with one Fe(12)Ta2P4 tetrahedra, and faces with two equivalent Fe(6)TaP4 tetrahedra. The Fe(15)-P(3) bond length is 2.25 Å. The Fe(15)-P(7) bond length is 2.27 Å. Both Fe(15)-P(1) bond lengths are 2.20 Å. In the sixteenth Fe site, Fe(16) is bonded to one P(4), one P(8), and two equivalent P(2) atoms to form a mixture of distorted corner and edge-sharing FeP4 tetrahedra. The Fe(16)-P(4) bond length is 2.18 Å. The Fe(16)-P(8) bond length is 2.18 Å. Both Fe(16)-P(2) bond lengths are 2.23 Å. In the seventeenth Fe site, Fe(17) is bonded in a 5-coordinate geometry to one P(9), two equivalent P(4), and two equivalent P(8) atoms. The Fe(17)-P(9) bond length is 2.28 Å. Both Fe(17)-P(4) bond lengths are 2.54 Å. Both Fe(17)-P(8) bond lengths are 2.43 Å. In the eighteenth Fe site, Fe(18) is bonded in a 5-coordinate geometry to one P(12), two equivalent P(1), and two equivalent P(5) atoms. The Fe(18)-P(12) bond length is 2.25 Å. Both Fe(18)-P(1) bond lengths are 2.56 Å. Both Fe(18)-P(5) bond lengths are 2.51 Å. In the nineteenth Fe site, Fe(19) is bonded in a 5-coordinate geometry to one P(11), two equivalent P(2), and two equivalent P(6) atoms. The Fe(19)-P(11) bond length is 2.27 Å. Both Fe(19)-P(2) bond lengths are 2.52 Å. Both Fe(19)-P(6) bond lengths are 2.46 Å. There are twelve inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Sc(3), one Fe(1), one Fe(13), one Fe(6), two equivalent Fe(15), and two equivalent Fe(18) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Sc(4), one Fe(14), one Fe(2), one Fe(5), two equivalent Fe(16), and two equivalent Fe(19) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Sc(1), two equivalent Ta(1), one Fe(15), one Fe(3), one Fe(8), and two equivalent Fe(13) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Sc(2), one Fe(16), one Fe(4), one Fe(7), two equivalent Fe(14), and two equivalent Fe(17) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Sc(4), one Fe(10), one Fe(13), one Fe(2), two equivalent Fe(18), and two equivalent Fe(8) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Sc(3), one Fe(1), one Fe(14), one Fe(9), two equivalent Fe(19), and two equivalent Fe(7) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to two equivalent Sc(2), two equivalent Ta(1), one Fe(12), one Fe(15), one Fe(4), and two equivalent Fe(6) atoms. In the eighth P site, P(8) is bonded in a 9-coordinate geometry to two equivalent Sc(1), one Fe(11), one Fe(16), one Fe(3), two equivalent Fe(17), and two equivalent Fe(5) atoms. In the ninth P site, P(9) is bonded in a 9-coordinate geometry to two equivalent Sc(3), one Fe(17), one Fe(6), one Fe(9), two equivalent Fe(11), and two equivalent Fe(4) atoms. In the tenth P site, P(10) is bonded in a 9-coordinate geometry to two equivalent Sc(4), one Ta(1), one Fe(10), one Fe(5), two equivalent Fe(12), and two equivalent Fe(3) atoms. In the eleventh P site, P(11) is bonded in a 9-coordinate geometry to two equivalent Sc(1), one Fe(11), one Fe(19), one Fe(8), two equivalent Fe(2), and two equivalent Fe(9) atoms. In the twelfth P site, P(12) is bonded in a 9-coordinate geometry to two equivalent Sc(2), one Fe(12), one Fe(18), one Fe(7), two equivalent Fe(1), and two equivalent Fe(10) atoms.