Tb3Au3Ga8 crystallizes in the orthorhombic Immm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 16-coordinate geometry to four equivalent Au(2), four equivalent Ga(1), and eight equivalent Ga(2) atoms. In the second Tb site, Tb(2) is bonded in a 12-coordinate geometry to two equivalent Au(1), two equivalent Au(2), four equivalent Ga(2), and six equivalent Ga(1) atoms. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 12-coordinate geometry to four equivalent Tb(2), four equivalent Au(2), and four equivalent Ga(1) atoms. In the second Au site, Au(2) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), two equivalent Au(1), two equivalent Ga(2), and four equivalent Ga(1) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to one Tb(1), three equivalent Tb(2), one Au(1), two equivalent Au(2), and three equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded in a 1-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), one Au(2), and three equivalent Ga(1) atoms.
Tb3Au3Ga8 crystallizes in the orthorhombic Immm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 16-coordinate geometry to four equivalent Au(2), four equivalent Ga(1), and eight equivalent Ga(2) atoms. All Tb(1)-Au(2) bond lengths are 3.52 Å. All Tb(1)-Ga(1) bond lengths are 3.22 Å. All Tb(1)-Ga(2) bond lengths are 3.23 Å. In the second Tb site, Tb(2) is bonded in a 12-coordinate geometry to two equivalent Au(1), two equivalent Au(2), four equivalent Ga(2), and six equivalent Ga(1) atoms. Both Tb(2)-Au(1) bond lengths are 3.27 Å. Both Tb(2)-Au(2) bond lengths are 3.16 Å. All Tb(2)-Ga(2) bond lengths are 3.09 Å. There are four shorter (3.08 Å) and two longer (3.40 Å) Tb(2)-Ga(1) bond lengths. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 12-coordinate geometry to four equivalent Tb(2), four equivalent Au(2), and four equivalent Ga(1) atoms. All Au(1)-Au(2) bond lengths are 2.93 Å. All Au(1)-Ga(1) bond lengths are 2.76 Å. In the second Au site, Au(2) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), two equivalent Au(1), two equivalent Ga(2), and four equivalent Ga(1) atoms. Both Au(2)-Ga(2) bond lengths are 2.58 Å. All Au(2)-Ga(1) bond lengths are 2.81 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to one Tb(1), three equivalent Tb(2), one Au(1), two equivalent Au(2), and three equivalent Ga(2) atoms. There are two shorter (2.60 Å) and one longer (2.64 Å) Ga(1)-Ga(2) bond length. In the second Ga site, Ga(2) is bonded in a 1-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), one Au(2), and three equivalent Ga(1) atoms.