Dy2Mn3Si5 crystallizes in the tetragonal P4/mnc space group. Dy(1) is bonded in a 13-coordinate geometry to two equivalent Mn(1), two equivalent Mn(2), two equivalent Si(1), three equivalent Si(3), and four equivalent Si(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to four equivalent Dy(1), two equivalent Si(2), and four equivalent Si(3) atoms. In the second Mn site, Mn(2) is bonded in a 6-coordinate geometry to two equivalent Dy(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(3) is bonded in a 9-coordinate geometry to three equivalent Dy(1), two equivalent Mn(1), two equivalent Mn(2), and two equivalent Si(2) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Dy(1), four equivalent Mn(2), and one Si(1) atom. In the third Si site, Si(2) is bonded in a 11-coordinate geometry to four equivalent Dy(1), one Mn(1), two equivalent Mn(2), two equivalent Si(2), and two equivalent Si(3) atoms.
Dy2Mn3Si5 crystallizes in the tetragonal P4/mnc space group. Dy(1) is bonded in a 13-coordinate geometry to two equivalent Mn(1), two equivalent Mn(2), two equivalent Si(1), three equivalent Si(3), and four equivalent Si(2) atoms. Both Dy(1)-Mn(1) bond lengths are 3.20 Å. Both Dy(1)-Mn(2) bond lengths are 3.09 Å. Both Dy(1)-Si(1) bond lengths are 2.96 Å. There is one shorter (2.80 Å) and two longer (2.91 Å) Dy(1)-Si(3) bond lengths. There are two shorter (3.05 Å) and two longer (3.13 Å) Dy(1)-Si(2) bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to four equivalent Dy(1), two equivalent Si(2), and four equivalent Si(3) atoms. Both Mn(1)-Si(2) bond lengths are 2.64 Å. All Mn(1)-Si(3) bond lengths are 2.40 Å. In the second Mn site, Mn(2) is bonded in a 6-coordinate geometry to two equivalent Dy(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. Both Mn(2)-Si(1) bond lengths are 2.41 Å. Both Mn(2)-Si(2) bond lengths are 2.46 Å. There is one shorter (2.39 Å) and one longer (2.44 Å) Mn(2)-Si(3) bond length. There are three inequivalent Si sites. In the first Si site, Si(3) is bonded in a 9-coordinate geometry to three equivalent Dy(1), two equivalent Mn(1), two equivalent Mn(2), and two equivalent Si(2) atoms. Both Si(3)-Si(2) bond lengths are 2.50 Å. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Dy(1), four equivalent Mn(2), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.63 Å. In the third Si site, Si(2) is bonded in a 11-coordinate geometry to four equivalent Dy(1), one Mn(1), two equivalent Mn(2), two equivalent Si(2), and two equivalent Si(3) atoms. Both Si(2)-Si(2) bond lengths are 2.73 Å.