Dy3Si4 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one Si(7), two equivalent Si(1), and four equivalent Si(10) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one Si(8), two equivalent Si(2), and four equivalent Si(11) atoms. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one Si(9), two equivalent Si(3), and four equivalent Si(12) atoms. In the fourth Dy site, Dy(4) is bonded in a 7-coordinate geometry to one Si(10), two equivalent Si(4), and four equivalent Si(7) atoms. In the fifth Dy site, Dy(5) is bonded in a 7-coordinate geometry to one Si(11), two equivalent Si(5), and four equivalent Si(8) atoms. In the sixth Dy site, Dy(6) is bonded in a 7-coordinate geometry to one Si(12), two equivalent Si(6), and four equivalent Si(9) atoms. In the seventh Dy site, Dy(7) is bonded to two equivalent Si(15), two equivalent Si(7), four equivalent Si(16), and four equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. In the eighth Dy site, Dy(8) is bonded in a 8-coordinate geometry to two equivalent Si(13), two equivalent Si(8), and four equivalent Si(5) atoms. In the ninth Dy site, Dy(9) is bonded to two equivalent Si(14), two equivalent Si(9), and four equivalent Si(6) atoms to form a mixture of distorted face, corner, and edge-sharing DySi8 hexagonal bipyramids. In the tenth Dy site, Dy(10) is bonded in a 10-coordinate geometry to two equivalent Si(10), four equivalent Si(1), and four equivalent Si(13) atoms. In the eleventh Dy site, Dy(11) is bonded in a 10-coordinate geometry to two equivalent Si(11), four equivalent Si(14), and four equivalent Si(2) atoms. In the twelfth Dy site, Dy(12) is bonded to two equivalent Si(12), two equivalent Si(16), four equivalent Si(15), and four equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. There are sixteen inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(10), one Si(13), and two equivalent Si(10) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Dy(2), four equivalent Dy(11), one Si(14), and two equivalent Si(11) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Dy(3), four equivalent Dy(12), one Si(15), and two equivalent Si(12) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Dy(4), four equivalent Dy(7), one Si(16), and two equivalent Si(7) atoms. In the fifth Si site, Si(5) is bonded in a 8-coordinate geometry to two equivalent Dy(5), four equivalent Dy(8), and two equivalent Si(8) atoms. In the sixth Si site, Si(6) is bonded in a 8-coordinate geometry to two equivalent Dy(6), four equivalent Dy(9), and two equivalent Si(9) atoms. In the seventh Si site, Si(7) is bonded in a 9-coordinate geometry to one Dy(1), two equivalent Dy(7), four equivalent Dy(4), and two equivalent Si(4) atoms. In the eighth Si site, Si(8) is bonded in a 9-coordinate geometry to one Dy(2), two equivalent Dy(8), four equivalent Dy(5), and two equivalent Si(5) atoms. In the ninth Si site, Si(9) is bonded in a 9-coordinate geometry to one Dy(3), two equivalent Dy(9), four equivalent Dy(6), and two equivalent Si(6) atoms. In the tenth Si site, Si(10) is bonded in a 9-coordinate geometry to one Dy(4), two equivalent Dy(10), four equivalent Dy(1), and two equivalent Si(1) atoms. In the eleventh Si site, Si(11) is bonded in a 9-coordinate geometry to one Dy(5), two equivalent Dy(11), four equivalent Dy(2), and two equivalent Si(2) atoms. In the twelfth Si site, Si(12) is bonded in a 9-coordinate geometry to one Dy(6), two equivalent Dy(12), four equivalent Dy(3), and two equivalent Si(3) atoms. In the thirteenth Si site, Si(13) is bonded in a 7-coordinate geometry to two equivalent Dy(8), four equivalent Dy(10), and one Si(1) atom. In the fourteenth Si site, Si(14) is bonded in a 7-coordinate geometry to two equivalent Dy(9), four equivalent Dy(11), and one Si(2) atom. In the fifteenth Si site, Si(15) is bonded in a 9-coordinate geometry to two equivalent Dy(7), four equivalent Dy(12), one Si(3), and two equivalent Si(16) atoms. In the sixteenth Si site, Si(16) is bonded in a 9-coordinate geometry to two equivalent Dy(12), four equivalent Dy(7), one Si(4), and two equivalent Si(15) atoms.
Dy3Si4 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one Si(7), two equivalent Si(1), and four equivalent Si(10) atoms. The Dy(1)-Si(7) bond length is 2.91 Å. Both Dy(1)-Si(1) bond lengths are 2.98 Å. All Dy(1)-Si(10) bond lengths are 2.92 Å. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one Si(8), two equivalent Si(2), and four equivalent Si(11) atoms. The Dy(2)-Si(8) bond length is 3.05 Å. Both Dy(2)-Si(2) bond lengths are 2.99 Å. There are two shorter (2.91 Å) and two longer (2.92 Å) Dy(2)-Si(11) bond lengths. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one Si(9), two equivalent Si(3), and four equivalent Si(12) atoms. The Dy(3)-Si(9) bond length is 3.02 Å. Both Dy(3)-Si(3) bond lengths are 2.90 Å. All Dy(3)-Si(12) bond lengths are 2.90 Å. In the fourth Dy site, Dy(4) is bonded in a 7-coordinate geometry to one Si(10), two equivalent Si(4), and four equivalent Si(7) atoms. The Dy(4)-Si(10) bond length is 2.98 Å. Both Dy(4)-Si(4) bond lengths are 2.90 Å. All Dy(4)-Si(7) bond lengths are 2.90 Å. In the fifth Dy site, Dy(5) is bonded in a 7-coordinate geometry to one Si(11), two equivalent Si(5), and four equivalent Si(8) atoms. The Dy(5)-Si(11) bond length is 3.00 Å. Both Dy(5)-Si(5) bond lengths are 3.04 Å. There are two shorter (2.92 Å) and two longer (2.93 Å) Dy(5)-Si(8) bond lengths. In the sixth Dy site, Dy(6) is bonded in a 7-coordinate geometry to one Si(12), two equivalent Si(6), and four equivalent Si(9) atoms. The Dy(6)-Si(12) bond length is 2.91 Å. Both Dy(6)-Si(6) bond lengths are 3.03 Å. There are two shorter (2.92 Å) and two longer (2.93 Å) Dy(6)-Si(9) bond lengths. In the seventh Dy site, Dy(7) is bonded to two equivalent Si(15), two equivalent Si(7), four equivalent Si(16), and four equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. Both Dy(7)-Si(15) bond lengths are 3.09 Å. Both Dy(7)-Si(7) bond lengths are 3.38 Å. There are two shorter (3.03 Å) and two longer (3.04 Å) Dy(7)-Si(16) bond lengths. There are two shorter (3.08 Å) and two longer (3.10 Å) Dy(7)-Si(4) bond lengths. In the eighth Dy site, Dy(8) is bonded in a 8-coordinate geometry to two equivalent Si(13), two equivalent Si(8), and four equivalent Si(5) atoms. Both Dy(8)-Si(13) bond lengths are 2.96 Å. Both Dy(8)-Si(8) bond lengths are 3.23 Å. All Dy(8)-Si(5) bond lengths are 2.99 Å. In the ninth Dy site, Dy(9) is bonded to two equivalent Si(14), two equivalent Si(9), and four equivalent Si(6) atoms to form a mixture of distorted face, corner, and edge-sharing DySi8 hexagonal bipyramids. Both Dy(9)-Si(14) bond lengths are 2.96 Å. Both Dy(9)-Si(9) bond lengths are 3.20 Å. All Dy(9)-Si(6) bond lengths are 2.99 Å. In the tenth Dy site, Dy(10) is bonded in a 10-coordinate geometry to two equivalent Si(10), four equivalent Si(1), and four equivalent Si(13) atoms. Both Dy(10)-Si(10) bond lengths are 3.24 Å. There are two shorter (3.00 Å) and two longer (3.03 Å) Dy(10)-Si(1) bond lengths. There are two shorter (3.05 Å) and two longer (3.22 Å) Dy(10)-Si(13) bond lengths. In the eleventh Dy site, Dy(11) is bonded in a 10-coordinate geometry to two equivalent Si(11), four equivalent Si(14), and four equivalent Si(2) atoms. Both Dy(11)-Si(11) bond lengths are 3.26 Å. There are two shorter (3.04 Å) and two longer (3.23 Å) Dy(11)-Si(14) bond lengths. There are two shorter (3.01 Å) and two longer (3.03 Å) Dy(11)-Si(2) bond lengths. In the twelfth Dy site, Dy(12) is bonded to two equivalent Si(12), two equivalent Si(16), four equivalent Si(15), and four equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. Both Dy(12)-Si(12) bond lengths are 3.38 Å. Both Dy(12)-Si(16) bond lengths are 3.09 Å. There are two shorter (3.03 Å) and two longer (3.04 Å) Dy(12)-Si(15) bond lengths. There are two shorter (3.08 Å) and two longer (3.10 Å) Dy(12)-Si(3) bond lengths. There are sixteen inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(10), one Si(13), and two equivalent Si(10) atoms. The Si(1)-Si(13) bond length is 2.35 Å. There is one shorter (2.42 Å) and one longer (2.45 Å) Si(1)-Si(10) bond length. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Dy(2), four equivalent Dy(11), one Si(14), and two equivalent Si(11) atoms. The Si(2)-Si(14) bond length is 2.35 Å. There is one shorter (2.43 Å) and one longer (2.46 Å) Si(2)-Si(11) bond length. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Dy(3), four equivalent Dy(12), one Si(15), and two equivalent Si(12) atoms. The Si(3)-Si(15) bond length is 2.30 Å. Both Si(3)-Si(12) bond lengths are 2.42 Å. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Dy(4), four equivalent Dy(7), one Si(16), and two equivalent Si(7) atoms. The Si(4)-Si(16) bond length is 2.30 Å. There is one shorter (2.41 Å) and one longer (2.42 Å) Si(4)-Si(7) bond length. In the fifth Si site, Si(5) is bonded in a 8-coordinate geometry to two equivalent Dy(5), four equivalent Dy(8), and two equivalent Si(8) atoms. Both Si(5)-Si(8) bond lengths are 2.47 Å. In the sixth Si site, Si(6) is bonded in a 8-coordinate geometry to two equivalent Dy(6), four equivalent Dy(9), and two equivalent Si(9) atoms. Both Si(6)-Si(9) bond lengths are 2.46 Å. In the seventh Si site, Si(7) is bonded in a 9-coordinate geometry to one Dy(1), two equivalent Dy(7), four equivalent Dy(4), and two equivalent Si(4) atoms. In the eighth Si site, Si(8) is bonded in a 9-coordinate geometry to one Dy(2), two equivalent Dy(8), four equivalent Dy(5), and two equivalent Si(5) atoms. In the ninth Si site, Si(9) is bonded in a 9-coordinate geometry to one Dy(3), two equivalent Dy(9), four equivalent Dy(6), and two equivalent Si(6) atoms. In the tenth Si site, Si(10) is bonded in a 9-coordinate geometry to one Dy(4), two equivalent Dy(10), four equivalent Dy(1), and two equivalent Si(1) atoms. In the eleventh Si site, Si(11) is bonded in a 9-coordinate geometry to one Dy(5), two equivalent Dy(11), four equivalent Dy(2), and two equivalent Si(2) atoms. In the twelfth Si site, Si(12) is bonded in a 9-coordinate geometry to one Dy(6), two equivalent Dy(12), four equivalent Dy(3), and two equivalent Si(3) atoms. In the thirteenth Si site, Si(13) is bonded in a 7-coordinate geometry to two equivalent Dy(8), four equivalent Dy(10), and one Si(1) atom. In the fourteenth Si site, Si(14) is bonded in a 7-coordinate geometry to two equivalent Dy(9), four equivalent Dy(11), and one Si(2) atom. In the fifteenth Si site, Si(15) is bonded in a 9-coordinate geometry to two equivalent Dy(7), four equivalent Dy(12), one Si(3), and two equivalent Si(16) atoms. Both Si(15)-Si(16) bond lengths are 2.29 Å. In the sixteenth Si site, Si(16) is bonded in a 9-coordinate geometry to two equivalent Dy(12), four equivalent Dy(7), one Si(4), and two equivalent Si(15) atoms.