Dy3Fe2Si3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 10-coordinate geometry to four equivalent Fe(1), two equivalent Si(2), and five equivalent Si(1) atoms. In the second Dy site, Dy(2) is bonded in a 9-coordinate geometry to four equivalent Fe(1), two equivalent Si(1), and three equivalent Si(2) atoms. Fe(1) is bonded in a 10-coordinate geometry to two equivalent Dy(2), four equivalent Dy(1), one Si(2), and three equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to one Dy(2), five equivalent Dy(1), three equivalent Fe(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Dy(2), four equivalent Dy(1), and two equivalent Fe(1) atoms.
Dy3Fe2Si3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 10-coordinate geometry to four equivalent Fe(1), two equivalent Si(2), and five equivalent Si(1) atoms. There are a spread of Dy(1)-Fe(1) bond distances ranging from 2.98-3.15 Å. Both Dy(1)-Si(2) bond lengths are 2.95 Å. There are a spread of Dy(1)-Si(1) bond distances ranging from 2.94-3.25 Å. In the second Dy site, Dy(2) is bonded in a 9-coordinate geometry to four equivalent Fe(1), two equivalent Si(1), and three equivalent Si(2) atoms. All Dy(2)-Fe(1) bond lengths are 3.19 Å. Both Dy(2)-Si(1) bond lengths are 2.86 Å. There are two shorter (2.85 Å) and one longer (3.29 Å) Dy(2)-Si(2) bond length. Fe(1) is bonded in a 10-coordinate geometry to two equivalent Dy(2), four equivalent Dy(1), one Si(2), and three equivalent Si(1) atoms. The Fe(1)-Si(2) bond length is 2.57 Å. There are two shorter (2.31 Å) and one longer (2.34 Å) Fe(1)-Si(1) bond length. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to one Dy(2), five equivalent Dy(1), three equivalent Fe(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.87 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Dy(2), four equivalent Dy(1), and two equivalent Fe(1) atoms.