Tb2Al5Ge2 is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Cmce space group. Tb(1) is bonded in a 14-coordinate geometry to two equivalent Al(2), four equivalent Al(1), four equivalent Al(3), and four equivalent Ge(1) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 6-coordinate geometry to four equivalent Tb(1), four equivalent Al(1), and two equivalent Ge(1) atoms. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to four equivalent Tb(1), one Al(1), two equivalent Al(3), and four equivalent Ge(1) atoms. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Al(2), and four equivalent Al(3) atoms.
Tb2Al5Ge2 is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Cmce space group. Tb(1) is bonded in a 14-coordinate geometry to two equivalent Al(2), four equivalent Al(1), four equivalent Al(3), and four equivalent Ge(1) atoms. Both Tb(1)-Al(2) bond lengths are 3.47 Å. There are two shorter (3.22 Å) and two longer (3.23 Å) Tb(1)-Al(1) bond lengths. There are two shorter (3.24 Å) and two longer (3.39 Å) Tb(1)-Al(3) bond lengths. There are a spread of Tb(1)-Ge(1) bond distances ranging from 3.06-3.28 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. The Al(1)-Al(3) bond length is 2.62 Å. Both Al(1)-Al(1) bond lengths are 2.88 Å. Both Al(1)-Al(2) bond lengths are 2.58 Å. In the second Al site, Al(2) is bonded in a 6-coordinate geometry to four equivalent Tb(1), four equivalent Al(1), and two equivalent Ge(1) atoms. Both Al(2)-Ge(1) bond lengths are 2.84 Å. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to four equivalent Tb(1), one Al(1), two equivalent Al(3), and four equivalent Ge(1) atoms. Both Al(3)-Al(3) bond lengths are 2.88 Å. There are two shorter (2.68 Å) and two longer (2.85 Å) Al(3)-Ge(1) bond lengths. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Al(2), and four equivalent Al(3) atoms.