Tb12FeCoBi4 crystallizes in the monoclinic Pm space group. There are twelve inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 4-coordinate geometry to one Co(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. In the second Tb site, Tb(2) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(2), and two equivalent Bi(4) atoms. In the third Tb site, Tb(3) is bonded in a 4-coordinate geometry to two equivalent Co(1), one Bi(1), and one Bi(3) atom. In the fourth Tb site, Tb(4) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(2), and one Bi(4) atom. In the fifth Tb site, Tb(5) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(4) atom. In the sixth Tb site, Tb(6) is bonded in a 4-coordinate geometry to two equivalent Co(1), one Bi(2), and one Bi(3) atom. In the seventh Tb site, Tb(7) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(3) atom. In the eighth Tb site, Tb(8) is bonded in a 4-coordinate geometry to two equivalent Co(1), one Bi(2), and one Bi(4) atom. In the ninth Tb site, Tb(9) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. In the tenth Tb site, Tb(10) is bonded in a 5-coordinate geometry to one Co(1), two equivalent Bi(2), and two equivalent Bi(4) atoms. In the eleventh Tb site, Tb(11) is bonded in a 5-coordinate geometry to one Co(1), two equivalent Bi(2), and two equivalent Bi(3) atoms. In the twelfth Tb site, Tb(12) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(4) atoms. Fe(1) is bonded in a 9-coordinate geometry to one Tb(12), one Tb(2), one Tb(9), two equivalent Tb(4), two equivalent Tb(5), and two equivalent Tb(7) atoms. Co(1) is bonded in a 9-coordinate geometry to one Tb(1), one Tb(10), one Tb(11), two equivalent Tb(3), two equivalent Tb(6), and two equivalent Tb(8) atoms. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), two equivalent Tb(1), two equivalent Tb(12), and two equivalent Tb(9) atoms. In the second Bi site, Bi(2) is bonded in a 9-coordinate geometry to one Tb(4), one Tb(6), one Tb(8), two equivalent Tb(10), two equivalent Tb(11), and two equivalent Tb(2) atoms. In the third Bi site, Bi(3) is bonded in a 9-coordinate geometry to one Tb(3), one Tb(6), one Tb(7), two equivalent Tb(1), two equivalent Tb(11), and two equivalent Tb(9) atoms. In the fourth Bi site, Bi(4) is bonded in a 9-coordinate geometry to one Tb(4), one Tb(5), one Tb(8), two equivalent Tb(10), two equivalent Tb(12), and two equivalent Tb(2) atoms.
Tb12FeCoBi4 crystallizes in the monoclinic Pm space group. There are twelve inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 4-coordinate geometry to one Co(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Tb(1)-Co(1) bond length is 3.53 Å. Both Tb(1)-Bi(1) bond lengths are 3.32 Å. Both Tb(1)-Bi(3) bond lengths are 3.30 Å. In the second Tb site, Tb(2) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(2), and two equivalent Bi(4) atoms. The Tb(2)-Fe(1) bond length is 3.48 Å. Both Tb(2)-Bi(2) bond lengths are 3.31 Å. Both Tb(2)-Bi(4) bond lengths are 3.29 Å. In the third Tb site, Tb(3) is bonded in a 4-coordinate geometry to two equivalent Co(1), one Bi(1), and one Bi(3) atom. Both Tb(3)-Co(1) bond lengths are 2.85 Å. The Tb(3)-Bi(1) bond length is 3.37 Å. The Tb(3)-Bi(3) bond length is 3.34 Å. In the fourth Tb site, Tb(4) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(2), and one Bi(4) atom. Both Tb(4)-Fe(1) bond lengths are 2.86 Å. The Tb(4)-Bi(2) bond length is 3.38 Å. The Tb(4)-Bi(4) bond length is 3.34 Å. In the fifth Tb site, Tb(5) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(4) atom. Both Tb(5)-Fe(1) bond lengths are 2.88 Å. The Tb(5)-Bi(1) bond length is 3.31 Å. The Tb(5)-Bi(4) bond length is 3.35 Å. In the sixth Tb site, Tb(6) is bonded in a 4-coordinate geometry to two equivalent Co(1), one Bi(2), and one Bi(3) atom. Both Tb(6)-Co(1) bond lengths are 2.92 Å. The Tb(6)-Bi(2) bond length is 3.32 Å. The Tb(6)-Bi(3) bond length is 3.36 Å. In the seventh Tb site, Tb(7) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(3) atom. Both Tb(7)-Fe(1) bond lengths are 2.81 Å. The Tb(7)-Bi(1) bond length is 3.27 Å. The Tb(7)-Bi(3) bond length is 3.29 Å. In the eighth Tb site, Tb(8) is bonded in a 4-coordinate geometry to two equivalent Co(1), one Bi(2), and one Bi(4) atom. Both Tb(8)-Co(1) bond lengths are 2.77 Å. The Tb(8)-Bi(2) bond length is 3.29 Å. The Tb(8)-Bi(4) bond length is 3.30 Å. In the ninth Tb site, Tb(9) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Tb(9)-Fe(1) bond length is 3.31 Å. Both Tb(9)-Bi(1) bond lengths are 3.30 Å. Both Tb(9)-Bi(3) bond lengths are 3.33 Å. In the tenth Tb site, Tb(10) is bonded in a 5-coordinate geometry to one Co(1), two equivalent Bi(2), and two equivalent Bi(4) atoms. The Tb(10)-Co(1) bond length is 3.35 Å. Both Tb(10)-Bi(2) bond lengths are 3.32 Å. Both Tb(10)-Bi(4) bond lengths are 3.32 Å. In the eleventh Tb site, Tb(11) is bonded in a 5-coordinate geometry to one Co(1), two equivalent Bi(2), and two equivalent Bi(3) atoms. The Tb(11)-Co(1) bond length is 3.17 Å. Both Tb(11)-Bi(2) bond lengths are 3.33 Å. Both Tb(11)-Bi(3) bond lengths are 3.33 Å. In the twelfth Tb site, Tb(12) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(4) atoms. The Tb(12)-Fe(1) bond length is 3.22 Å. Both Tb(12)-Bi(1) bond lengths are 3.34 Å. Both Tb(12)-Bi(4) bond lengths are 3.31 Å. Fe(1) is bonded in a 9-coordinate geometry to one Tb(12), one Tb(2), one Tb(9), two equivalent Tb(4), two equivalent Tb(5), and two equivalent Tb(7) atoms. Co(1) is bonded in a 9-coordinate geometry to one Tb(1), one Tb(10), one Tb(11), two equivalent Tb(3), two equivalent Tb(6), and two equivalent Tb(8) atoms. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), two equivalent Tb(1), two equivalent Tb(12), and two equivalent Tb(9) atoms. In the second Bi site, Bi(2) is bonded in a 9-coordinate geometry to one Tb(4), one Tb(6), one Tb(8), two equivalent Tb(10), two equivalent Tb(11), and two equivalent Tb(2) atoms. In the third Bi site, Bi(3) is bonded in a 9-coordinate geometry to one Tb(3), one Tb(6), one Tb(7), two equivalent Tb(1), two equivalent Tb(11), and two equivalent Tb(9) atoms. In the fourth Bi site, Bi(4) is bonded in a 9-coordinate geometry to one Tb(4), one Tb(5), one Tb(8), two equivalent Tb(10), two equivalent Tb(12), and two equivalent Tb(2) atoms.