Dy2Sc3Si4 crystallizes in the orthorhombic Pnma space group. Dy(1) is bonded in a 7-coordinate geometry to one Si(1), two equivalent Si(2), and four equivalent Si(3) atoms. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form distorted corner-sharing ScSi6 octahedra. The corner-sharing octahedral tilt angles range from 53-54°. In the second Sc site, Sc(2) is bonded in a 6-coordinate geometry to one Si(2), two equivalent Si(1), and three equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Dy(1), two equivalent Sc(1), four equivalent Sc(2), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Dy(1), two equivalent Sc(1), two equivalent Sc(2), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Dy(1), one Sc(1), three equivalent Sc(2), and one Si(3) atom.
Dy2Sc3Si4 crystallizes in the orthorhombic Pnma space group. Dy(1) is bonded in a 7-coordinate geometry to one Si(1), two equivalent Si(2), and four equivalent Si(3) atoms. The Dy(1)-Si(1) bond length is 3.05 Å. There is one shorter (2.95 Å) and one longer (3.02 Å) Dy(1)-Si(2) bond length. There are a spread of Dy(1)-Si(3) bond distances ranging from 2.93-3.32 Å. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form distorted corner-sharing ScSi6 octahedra. The corner-sharing octahedral tilt angles range from 53-54°. There is one shorter (2.77 Å) and one longer (3.01 Å) Sc(1)-Si(1) bond length. There is one shorter (2.82 Å) and one longer (2.87 Å) Sc(1)-Si(2) bond length. Both Sc(1)-Si(3) bond lengths are 2.96 Å. In the second Sc site, Sc(2) is bonded in a 6-coordinate geometry to one Si(2), two equivalent Si(1), and three equivalent Si(3) atoms. The Sc(2)-Si(2) bond length is 2.86 Å. There is one shorter (2.73 Å) and one longer (2.76 Å) Sc(2)-Si(1) bond length. There are a spread of Sc(2)-Si(3) bond distances ranging from 2.74-2.82 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Dy(1), two equivalent Sc(1), four equivalent Sc(2), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.53 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Dy(1), two equivalent Sc(1), two equivalent Sc(2), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Dy(1), one Sc(1), three equivalent Sc(2), and one Si(3) atom. The Si(3)-Si(3) bond length is 2.54 Å.