Tb2Ru3Si5 crystallizes in the orthorhombic Ibam space group. Tb(1) is bonded in a 16-coordinate geometry to two equivalent Ru(2), four equivalent Ru(1), two equivalent Si(1), four equivalent Si(2), and four equivalent Si(3) atoms. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Si(3), two equivalent Si(1), and two equivalent Si(2) atoms. In the second Ru site, Ru(2) is bonded in a 6-coordinate geometry to four equivalent Tb(1), two equivalent Si(2), and four equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to four equivalent Tb(1) and four equivalent Ru(1) atoms. In the second Si site, Si(2) is bonded in a 11-coordinate geometry to four equivalent Tb(1), one Ru(2), two equivalent Ru(1), two equivalent Si(2), and two equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Ru(1), two equivalent Ru(2), and two equivalent Si(2) atoms.
Tb2Ru3Si5 crystallizes in the orthorhombic Ibam space group. Tb(1) is bonded in a 16-coordinate geometry to two equivalent Ru(2), four equivalent Ru(1), two equivalent Si(1), four equivalent Si(2), and four equivalent Si(3) atoms. Both Tb(1)-Ru(2) bond lengths are 3.36 Å. There are a spread of Tb(1)-Ru(1) bond distances ranging from 3.10-3.14 Å. Both Tb(1)-Si(1) bond lengths are 3.10 Å. There are two shorter (3.06 Å) and two longer (3.24 Å) Tb(1)-Si(2) bond lengths. There are a spread of Tb(1)-Si(3) bond distances ranging from 2.96-3.31 Å. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Si(3), two equivalent Si(1), and two equivalent Si(2) atoms. The Ru(1)-Si(3) bond length is 2.37 Å. Both Ru(1)-Si(1) bond lengths are 2.42 Å. Both Ru(1)-Si(2) bond lengths are 2.42 Å. In the second Ru site, Ru(2) is bonded in a 6-coordinate geometry to four equivalent Tb(1), two equivalent Si(2), and four equivalent Si(3) atoms. Both Ru(2)-Si(2) bond lengths are 2.52 Å. All Ru(2)-Si(3) bond lengths are 2.43 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to four equivalent Tb(1) and four equivalent Ru(1) atoms. In the second Si site, Si(2) is bonded in a 11-coordinate geometry to four equivalent Tb(1), one Ru(2), two equivalent Ru(1), two equivalent Si(2), and two equivalent Si(3) atoms. Both Si(2)-Si(2) bond lengths are 2.80 Å. Both Si(2)-Si(3) bond lengths are 2.53 Å. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Ru(1), two equivalent Ru(2), and two equivalent Si(2) atoms.