Dy10Si17 crystallizes in the orthorhombic Imm2 space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 11-coordinate geometry to one Si(10), one Si(3), one Si(7), two equivalent Si(5), two equivalent Si(6), two equivalent Si(8), and two equivalent Si(9) atoms. In the second Dy site, Dy(2) is bonded in a 10-coordinate geometry to one Si(5), one Si(6), one Si(8), one Si(9), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms. In the third Dy site, Dy(3) is bonded in a 10-coordinate geometry to one Si(1), one Si(10), one Si(2), one Si(3), one Si(4), one Si(5), one Si(6), one Si(7), one Si(8), and one Si(9) atom. There are ten inequivalent Si sites. In the first Si site, Si(9) is bonded in a 9-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(1), one Si(10), and one Si(6) atom. In the second Si site, Si(10) is bonded in a 8-coordinate geometry to two equivalent Dy(1), four equivalent Dy(3), and two equivalent Si(9) atoms. In the third Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Dy(3), four equivalent Dy(2), one Si(4), and one Si(9) atom. In the fourth Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Dy(3), four equivalent Dy(2), one Si(4), and one Si(5) atom. In the fifth Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(3), one Si(7), and two equivalent Si(8) atoms. In the sixth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Dy(3), four equivalent Dy(2), one Si(1), one Si(2), and one Si(6) atom. In the seventh Si site, Si(5) is bonded in a 9-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(2), one Si(7), and one Si(8) atom. In the eighth Si site, Si(6) is bonded in a 8-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(4), and one Si(9) atom. In the ninth Si site, Si(7) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(3), one Si(3), and two equivalent Si(5) atoms. In the tenth Si site, Si(8) is bonded in a 8-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(3), and one Si(5) atom.
Dy10Si17 crystallizes in the orthorhombic Imm2 space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 11-coordinate geometry to one Si(10), one Si(3), one Si(7), two equivalent Si(5), two equivalent Si(6), two equivalent Si(8), and two equivalent Si(9) atoms. The Dy(1)-Si(10) bond length is 3.23 Å. The Dy(1)-Si(3) bond length is 2.95 Å. The Dy(1)-Si(7) bond length is 2.99 Å. Both Dy(1)-Si(5) bond lengths are 3.02 Å. Both Dy(1)-Si(6) bond lengths are 2.95 Å. Both Dy(1)-Si(8) bond lengths are 3.32 Å. Both Dy(1)-Si(9) bond lengths are 3.05 Å. In the second Dy site, Dy(2) is bonded in a 10-coordinate geometry to one Si(5), one Si(6), one Si(8), one Si(9), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms. The Dy(2)-Si(5) bond length is 2.96 Å. The Dy(2)-Si(6) bond length is 3.28 Å. The Dy(2)-Si(8) bond length is 2.91 Å. The Dy(2)-Si(9) bond length is 3.01 Å. There is one shorter (2.92 Å) and one longer (2.95 Å) Dy(2)-Si(1) bond length. There is one shorter (2.94 Å) and one longer (3.28 Å) Dy(2)-Si(2) bond length. There is one shorter (3.03 Å) and one longer (3.05 Å) Dy(2)-Si(4) bond length. In the third Dy site, Dy(3) is bonded in a 10-coordinate geometry to one Si(1), one Si(10), one Si(2), one Si(3), one Si(4), one Si(5), one Si(6), one Si(7), one Si(8), and one Si(9) atom. The Dy(3)-Si(1) bond length is 3.23 Å. The Dy(3)-Si(10) bond length is 2.94 Å. The Dy(3)-Si(2) bond length is 2.92 Å. The Dy(3)-Si(3) bond length is 3.09 Å. The Dy(3)-Si(4) bond length is 3.02 Å. The Dy(3)-Si(5) bond length is 3.09 Å. The Dy(3)-Si(6) bond length is 2.95 Å. The Dy(3)-Si(7) bond length is 3.04 Å. The Dy(3)-Si(8) bond length is 2.94 Å. The Dy(3)-Si(9) bond length is 3.03 Å. There are ten inequivalent Si sites. In the first Si site, Si(9) is bonded in a 9-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(1), one Si(10), and one Si(6) atom. The Si(9)-Si(1) bond length is 2.38 Å. The Si(9)-Si(10) bond length is 2.37 Å. The Si(9)-Si(6) bond length is 2.37 Å. In the second Si site, Si(10) is bonded in a 8-coordinate geometry to two equivalent Dy(1), four equivalent Dy(3), and two equivalent Si(9) atoms. In the third Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Dy(3), four equivalent Dy(2), one Si(4), and one Si(9) atom. The Si(1)-Si(4) bond length is 2.40 Å. In the fourth Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Dy(3), four equivalent Dy(2), one Si(4), and one Si(5) atom. The Si(2)-Si(4) bond length is 2.41 Å. The Si(2)-Si(5) bond length is 2.37 Å. In the fifth Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(3), one Si(7), and two equivalent Si(8) atoms. The Si(3)-Si(7) bond length is 2.33 Å. Both Si(3)-Si(8) bond lengths are 2.42 Å. In the sixth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Dy(3), four equivalent Dy(2), one Si(1), one Si(2), and one Si(6) atom. The Si(4)-Si(6) bond length is 2.42 Å. In the seventh Si site, Si(5) is bonded in a 9-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(2), one Si(7), and one Si(8) atom. The Si(5)-Si(7) bond length is 2.32 Å. The Si(5)-Si(8) bond length is 2.37 Å. In the eighth Si site, Si(6) is bonded in a 8-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(4), and one Si(9) atom. In the ninth Si site, Si(7) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(3), one Si(3), and two equivalent Si(5) atoms. In the tenth Si site, Si(8) is bonded in a 8-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), two equivalent Dy(3), one Si(3), and one Si(5) atom.