TbGe2 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to two equivalent Ge(1), four equivalent Ge(5), and six equivalent Ge(2) atoms to form a mixture of distorted face and edge-sharing TbGe12 cuboctahedra. In the second Tb site, Tb(2) is bonded in a 10-coordinate geometry to two equivalent Ge(3), two equivalent Ge(4), two equivalent Ge(5), and four equivalent Ge(1) atoms. There are five inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Tb(1), four equivalent Tb(2), and two equivalent Ge(5) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to six equivalent Tb(1), one Ge(5), and two equivalent Ge(2) atoms. In the third Ge site, Ge(3) is bonded in a 8-coordinate geometry to four equivalent Tb(2) and four equivalent Ge(4) atoms. In the fourth Ge site, Ge(4) is bonded in a distorted body-centered cubic geometry to four equivalent Tb(2) and four equivalent Ge(3) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to two equivalent Tb(2), four equivalent Tb(1), one Ge(2), and two equivalent Ge(1) atoms.
TbGe2 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to two equivalent Ge(1), four equivalent Ge(5), and six equivalent Ge(2) atoms to form a mixture of distorted face and edge-sharing TbGe12 cuboctahedra. Both Tb(1)-Ge(1) bond lengths are 3.56 Å. All Tb(1)-Ge(5) bond lengths are 3.14 Å. There are four shorter (3.15 Å) and two longer (3.34 Å) Tb(1)-Ge(2) bond lengths. In the second Tb site, Tb(2) is bonded in a 10-coordinate geometry to two equivalent Ge(3), two equivalent Ge(4), two equivalent Ge(5), and four equivalent Ge(1) atoms. Both Tb(2)-Ge(3) bond lengths are 3.04 Å. Both Tb(2)-Ge(4) bond lengths are 2.99 Å. Both Tb(2)-Ge(5) bond lengths are 3.17 Å. All Tb(2)-Ge(1) bond lengths are 2.98 Å. There are five inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Tb(1), four equivalent Tb(2), and two equivalent Ge(5) atoms. Both Ge(1)-Ge(5) bond lengths are 2.58 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to six equivalent Tb(1), one Ge(5), and two equivalent Ge(2) atoms. The Ge(2)-Ge(5) bond length is 2.53 Å. Both Ge(2)-Ge(2) bond lengths are 2.51 Å. In the third Ge site, Ge(3) is bonded in a 8-coordinate geometry to four equivalent Tb(2) and four equivalent Ge(4) atoms. All Ge(3)-Ge(4) bond lengths are 2.88 Å. In the fourth Ge site, Ge(4) is bonded in a distorted body-centered cubic geometry to four equivalent Tb(2) and four equivalent Ge(3) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to two equivalent Tb(2), four equivalent Tb(1), one Ge(2), and two equivalent Ge(1) atoms.