Ru2Si3 crystallizes in the orthorhombic Pbcn space group. There are three inequivalent Ru sites. In the first Ru site, Ru(3) is bonded in a 7-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and three equivalent Si(2) atoms. In the second Ru site, Ru(1) is bonded to two equivalent Si(3) and four equivalent Si(1) atoms to form distorted edge-sharing RuSi6 octahedra. In the third Ru site, Ru(2) is bonded in a 8-coordinate geometry to four 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 two equivalent Ru(1) and two equivalent Ru(3) atoms. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to two equivalent Ru(2) and three equivalent Ru(3) atoms. In the third Si site, Si(3) is bonded in a 5-coordinate geometry to one Ru(1), two equivalent Ru(2), and two equivalent Ru(3) atoms.
Ru2Si3 crystallizes in the orthorhombic Pbcn space group. There are three inequivalent Ru sites. In the first Ru site, Ru(3) is bonded in a 7-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and three equivalent Si(2) atoms. There is one shorter (2.42 Å) and one longer (2.44 Å) Ru(3)-Si(1) bond length. There is one shorter (2.49 Å) and one longer (2.51 Å) Ru(3)-Si(3) bond length. There are a spread of Ru(3)-Si(2) bond distances ranging from 2.35-2.52 Å. In the second Ru site, Ru(1) is bonded to two equivalent Si(3) and four equivalent Si(1) atoms to form distorted edge-sharing RuSi6 octahedra. Both Ru(1)-Si(3) bond lengths are 2.37 Å. There are two shorter (2.32 Å) and two longer (2.46 Å) Ru(1)-Si(1) bond lengths. In the third Ru site, Ru(2) is bonded in a 8-coordinate geometry to four equivalent Si(2) and four equivalent Si(3) atoms. There are two shorter (2.37 Å) and two longer (2.74 Å) Ru(2)-Si(2) bond lengths. There are two shorter (2.41 Å) and two longer (2.58 Å) Ru(2)-Si(3) bond lengths. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to two equivalent Ru(1) and two equivalent Ru(3) atoms. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to two equivalent Ru(2) and three equivalent Ru(3) atoms. In the third Si site, Si(3) is bonded in a 5-coordinate geometry to one Ru(1), two equivalent Ru(2), and two equivalent Ru(3) atoms.