Er4Ir13Si9 crystallizes in the orthorhombic Pmmn space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to one Ir(3), one Ir(4), one Ir(6), one Ir(8), two equivalent Ir(1), two equivalent Ir(2), two equivalent Ir(7), two equivalent Si(3), two equivalent Si(5), and two equivalent Si(6) atoms. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to two equivalent Ir(1), two equivalent Ir(3), two equivalent Ir(8), six equivalent Ir(5), two equivalent Si(1), and four equivalent Si(2) atoms. In the third Er site, Er(3) is bonded in a 16-coordinate geometry to two equivalent Ir(2), two equivalent Ir(7), six equivalent Ir(6), two equivalent Si(4), and four equivalent Si(3) atoms. There are eight inequivalent Ir sites. In the first Ir site, Ir(3) is bonded to two equivalent Er(1), two equivalent Er(2), two equivalent Si(2), and two equivalent Si(6) atoms to form a mixture of distorted corner and edge-sharing IrEr4Si4 tetrahedra. In the second Ir site, Ir(4) is bonded in a 5-coordinate geometry to two equivalent Er(1), one Si(4), and four equivalent Si(5) atoms. In the third Ir site, Ir(5) is bonded in a 6-coordinate geometry to three equivalent Er(2), one Si(1), and three equivalent Si(2) atoms. In the fourth Ir site, Ir(6) is bonded to one Er(1), three equivalent Er(3), one Si(4), and three equivalent Si(3) atoms to form a mixture of distorted corner, face, and edge-sharing IrEr4Si4 tetrahedra. In the fifth Ir site, Ir(7) is bonded in a 6-coordinate geometry to one Er(3), two equivalent Er(1), one Si(3), one Si(5), and two equivalent Si(4) atoms. In the sixth Ir site, Ir(8) is bonded in a 5-coordinate geometry to one Er(1), one Er(2), one Si(2), two equivalent Si(1), and two equivalent Si(5) atoms. In the seventh Ir site, Ir(1) is bonded in a 4-coordinate geometry to one Er(2), two equivalent Er(1), one Si(5), one Si(6), and two equivalent Si(2) atoms. In the eighth Ir site, Ir(2) is bonded in a 9-coordinate geometry to two equivalent Er(3), four equivalent Er(1), one Si(6), and two equivalent Si(3) atoms. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Ir(5), four equivalent Ir(8), and two equivalent Si(5) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Ir(3), one Ir(8), two equivalent Ir(1), and three equivalent Ir(5) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Ir(2), one Ir(7), and three equivalent Ir(6) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Er(3), one Ir(4), two equivalent Ir(6), and four equivalent Ir(7) atoms. In the fifth Si site, Si(5) is bonded in a 10-coordinate geometry to two equivalent Er(1), one Ir(1), one Ir(7), two equivalent Ir(4), two equivalent Ir(8), one Si(1), and one Si(5) atom. In the sixth Si site, Si(6) is bonded in a 9-coordinate geometry to four equivalent Er(1), one Ir(2), two equivalent Ir(1), and two equivalent Ir(3) atoms.
Er4Ir13Si9 crystallizes in the orthorhombic Pmmn space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to one Ir(3), one Ir(4), one Ir(6), one Ir(8), two equivalent Ir(1), two equivalent Ir(2), two equivalent Ir(7), two equivalent Si(3), two equivalent Si(5), and two equivalent Si(6) atoms. The Er(1)-Ir(3) bond length is 3.29 Å. The Er(1)-Ir(4) bond length is 3.40 Å. The Er(1)-Ir(6) bond length is 3.27 Å. The Er(1)-Ir(8) bond length is 3.42 Å. Both Er(1)-Ir(1) bond lengths are 3.10 Å. Both Er(1)-Ir(2) bond lengths are 3.13 Å. Both Er(1)-Ir(7) bond lengths are 3.07 Å. Both Er(1)-Si(3) bond lengths are 3.11 Å. Both Er(1)-Si(5) bond lengths are 3.04 Å. Both Er(1)-Si(6) bond lengths are 3.08 Å. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to two equivalent Ir(1), two equivalent Ir(3), two equivalent Ir(8), six equivalent Ir(5), two equivalent Si(1), and four equivalent Si(2) atoms. Both Er(2)-Ir(1) bond lengths are 3.41 Å. Both Er(2)-Ir(3) bond lengths are 3.27 Å. Both Er(2)-Ir(8) bond lengths are 3.38 Å. There are four shorter (3.05 Å) and two longer (3.43 Å) Er(2)-Ir(5) bond lengths. Both Er(2)-Si(1) bond lengths are 3.02 Å. All Er(2)-Si(2) bond lengths are 3.07 Å. In the third Er site, Er(3) is bonded in a 16-coordinate geometry to two equivalent Ir(2), two equivalent Ir(7), six equivalent Ir(6), two equivalent Si(4), and four equivalent Si(3) atoms. Both Er(3)-Ir(2) bond lengths are 2.99 Å. Both Er(3)-Ir(7) bond lengths are 3.42 Å. There are four shorter (3.22 Å) and two longer (3.31 Å) Er(3)-Ir(6) bond lengths. Both Er(3)-Si(4) bond lengths are 3.07 Å. All Er(3)-Si(3) bond lengths are 3.05 Å. There are eight inequivalent Ir sites. In the first Ir site, Ir(3) is bonded to two equivalent Er(1), two equivalent Er(2), two equivalent Si(2), and two equivalent Si(6) atoms to form a mixture of distorted corner and edge-sharing IrEr4Si4 tetrahedra. Both Ir(3)-Si(2) bond lengths are 2.40 Å. Both Ir(3)-Si(6) bond lengths are 2.42 Å. In the second Ir site, Ir(4) is bonded in a 5-coordinate geometry to two equivalent Er(1), one Si(4), and four equivalent Si(5) atoms. The Ir(4)-Si(4) bond length is 2.36 Å. All Ir(4)-Si(5) bond lengths are 2.54 Å. In the third Ir site, Ir(5) is bonded in a 6-coordinate geometry to three equivalent Er(2), one Si(1), and three equivalent Si(2) atoms. The Ir(5)-Si(1) bond length is 2.39 Å. There is one shorter (2.35 Å) and two longer (2.58 Å) Ir(5)-Si(2) bond lengths. In the fourth Ir site, Ir(6) is bonded to one Er(1), three equivalent Er(3), one Si(4), and three equivalent Si(3) atoms to form a mixture of distorted corner, face, and edge-sharing IrEr4Si4 tetrahedra. The Ir(6)-Si(4) bond length is 2.43 Å. There are two shorter (2.40 Å) and one longer (2.41 Å) Ir(6)-Si(3) bond length. In the fifth Ir site, Ir(7) is bonded in a 6-coordinate geometry to one Er(3), two equivalent Er(1), one Si(3), one Si(5), and two equivalent Si(4) atoms. The Ir(7)-Si(3) bond length is 2.37 Å. The Ir(7)-Si(5) bond length is 2.40 Å. Both Ir(7)-Si(4) bond lengths are 2.52 Å. In the sixth Ir site, Ir(8) is bonded in a 5-coordinate geometry to one Er(1), one Er(2), one Si(2), two equivalent Si(1), and two equivalent Si(5) atoms. The Ir(8)-Si(2) bond length is 2.36 Å. Both Ir(8)-Si(1) bond lengths are 2.54 Å. Both Ir(8)-Si(5) bond lengths are 2.53 Å. In the seventh Ir site, Ir(1) is bonded in a 4-coordinate geometry to one Er(2), two equivalent Er(1), one Si(5), one Si(6), and two equivalent Si(2) atoms. The Ir(1)-Si(5) bond length is 2.40 Å. The Ir(1)-Si(6) bond length is 2.38 Å. Both Ir(1)-Si(2) bond lengths are 2.47 Å. In the eighth Ir site, Ir(2) is bonded in a 9-coordinate geometry to two equivalent Er(3), four equivalent Er(1), one Si(6), and two equivalent Si(3) atoms. The Ir(2)-Si(6) bond length is 2.38 Å. Both Ir(2)-Si(3) bond lengths are 2.36 Å. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Ir(5), four equivalent Ir(8), and two equivalent Si(5) atoms. Both Si(1)-Si(5) bond lengths are 2.76 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Er(2), one Ir(3), one Ir(8), two equivalent Ir(1), and three equivalent Ir(5) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Ir(2), one Ir(7), and three equivalent Ir(6) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Er(3), one Ir(4), two equivalent Ir(6), and four equivalent Ir(7) atoms. In the fifth Si site, Si(5) is bonded in a 10-coordinate geometry to two equivalent Er(1), one Ir(1), one Ir(7), two equivalent Ir(4), two equivalent Ir(8), one Si(1), and one Si(5) atom. The Si(5)-Si(5) bond length is 2.76 Å. In the sixth Si site, Si(6) is bonded in a 9-coordinate geometry to four equivalent Er(1), one Ir(2), two equivalent Ir(1), and two equivalent Ir(3) atoms.