Tb4Ni3Bi8 crystallizes in the tetragonal P-4m2 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 12-coordinate geometry to four equivalent Ni(1,3); two equivalent Bi(3); two equivalent Bi(4); and four equivalent Bi(2) atoms. In the second Tb site, Tb(2) is bonded in a 11-coordinate geometry to two equivalent Ni(2), two equivalent Bi(3), two equivalent Bi(4), and five equivalent Bi(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1,3) is bonded in a body-centered cubic geometry to four equivalent Tb(1) and four equivalent Bi(2) atoms. In the second Ni site, Ni(2) is bonded in a body-centered cubic geometry to four equivalent Tb(2) and four equivalent Bi(1) atoms. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to five equivalent Tb(2) and two equivalent Ni(2) atoms. In the second Bi site, Bi(2) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Ni(1,3) atoms. In the third Bi site, Bi(3) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), and four equivalent Bi(4) atoms. In the fourth Bi site, Bi(4) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), and four equivalent Bi(3) atoms.
Tb4Ni3Bi8 crystallizes in the tetragonal P-4m2 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 12-coordinate geometry to four equivalent Ni(1,3); two equivalent Bi(3); two equivalent Bi(4); and four equivalent Bi(2) atoms. All Tb(1)-Ni(1,3) bond lengths are 3.11 Å. Both Tb(1)-Bi(3) bond lengths are 3.43 Å. Both Tb(1)-Bi(4) bond lengths are 3.43 Å. All Tb(1)-Bi(2) bond lengths are 3.29 Å. In the second Tb site, Tb(2) is bonded in a 11-coordinate geometry to two equivalent Ni(2), two equivalent Bi(3), two equivalent Bi(4), and five equivalent Bi(1) atoms. Both Tb(2)-Ni(2) bond lengths are 3.10 Å. Both Tb(2)-Bi(3) bond lengths are 3.41 Å. Both Tb(2)-Bi(4) bond lengths are 3.41 Å. There are four shorter (3.31 Å) and one longer (3.41 Å) Tb(2)-Bi(1) bond length. There are two inequivalent Ni sites. In the first Ni site, Ni(1,3) is bonded in a body-centered cubic geometry to four equivalent Tb(1) and four equivalent Bi(2) atoms. All Ni(1,3)-Bi(2) bond lengths are 2.67 Å. In the second Ni site, Ni(2) is bonded in a body-centered cubic geometry to four equivalent Tb(2) and four equivalent Bi(1) atoms. All Ni(2)-Bi(1) bond lengths are 2.62 Å. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to five equivalent Tb(2) and two equivalent Ni(2) atoms. In the second Bi site, Bi(2) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Ni(1,3) atoms. In the third Bi site, Bi(3) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), and four equivalent Bi(4) atoms. All Bi(3)-Bi(4) bond lengths are 3.21 Å. In the fourth Bi site, Bi(4) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), and four equivalent Bi(3) atoms.