Er6Pt5Ga17 crystallizes in the monoclinic C2/m space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to one Ga(1), one Ga(2), one Ga(3), one Ga(4), two equivalent Ga(5), two equivalent Ga(6), two equivalent Ga(7), and two equivalent Ga(8) atoms. In the second Er site, Er(2) is bonded in a 12-coordinate geometry to two equivalent Pt(2), two equivalent Pt(3), one Ga(3), two equivalent Ga(1), two equivalent Ga(4), two equivalent Ga(6), and two equivalent Ga(8) atoms. In the third Er site, Er(3) is bonded in a 12-coordinate geometry to two equivalent Pt(1), two equivalent Ga(3), two equivalent Ga(5), two equivalent Ga(7), two equivalent Ga(9), and three equivalent Ga(2) atoms. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 10-coordinate geometry to two equivalent Er(3), one Ga(5), one Ga(8), two equivalent Ga(2), two equivalent Ga(3), and two equivalent Ga(9) atoms. In the second Pt site, Pt(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), one Ga(6), one Ga(7), two equivalent Ga(1), and two equivalent Ga(4) atoms. In the third Pt site, Pt(3) is bonded in a 8-coordinate geometry to four equivalent Er(2), two equivalent Ga(1), and two equivalent Ga(4) atoms. There are nine inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Er(2), one Pt(3), two equivalent Pt(2), and three equivalent Ga(6) atoms. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Er(1), three equivalent Er(3), two equivalent Pt(1), one Ga(9), and three equivalent Ga(5) atoms. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), two equivalent Er(3), two equivalent Pt(1), one Ga(7), one Ga(9), and two equivalent Ga(8) atoms. In the fourth Ga site, Ga(4) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Er(2), one Pt(3), two equivalent Pt(2), one Ga(8), and two equivalent Ga(7) atoms. In the fifth Ga site, Ga(5) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Pt(1), one Ga(7), and three equivalent Ga(2) atoms. In the sixth Ga site, Ga(6) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), one Pt(2), one Ga(8), and three equivalent Ga(1) atoms. In the seventh Ga site, Ga(7) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Pt(2), one Ga(3), one Ga(5), and two equivalent Ga(4) atoms. In the eighth Ga site, Ga(8) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), one Pt(1), one Ga(4), one Ga(6), and two equivalent Ga(3) atoms. In the ninth Ga site, Ga(9) is bonded to four equivalent Er(3), four equivalent Pt(1), two equivalent Ga(2), and two equivalent Ga(3) atoms to form face-sharing GaEr4Ga4Pt4 cuboctahedra.
Er6Pt5Ga17 crystallizes in the monoclinic C2/m space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to one Ga(1), one Ga(2), one Ga(3), one Ga(4), two equivalent Ga(5), two equivalent Ga(6), two equivalent Ga(7), and two equivalent Ga(8) atoms. The Er(1)-Ga(1) bond length is 3.18 Å. The Er(1)-Ga(2) bond length is 3.31 Å. The Er(1)-Ga(3) bond length is 3.28 Å. The Er(1)-Ga(4) bond length is 3.21 Å. Both Er(1)-Ga(5) bond lengths are 3.16 Å. Both Er(1)-Ga(6) bond lengths are 3.16 Å. Both Er(1)-Ga(7) bond lengths are 3.16 Å. Both Er(1)-Ga(8) bond lengths are 3.17 Å. In the second Er site, Er(2) is bonded in a 12-coordinate geometry to two equivalent Pt(2), two equivalent Pt(3), one Ga(3), two equivalent Ga(1), two equivalent Ga(4), two equivalent Ga(6), and two equivalent Ga(8) atoms. There is one shorter (3.02 Å) and one longer (3.03 Å) Er(2)-Pt(2) bond length. Both Er(2)-Pt(3) bond lengths are 3.07 Å. The Er(2)-Ga(3) bond length is 3.58 Å. Both Er(2)-Ga(1) bond lengths are 3.09 Å. Both Er(2)-Ga(4) bond lengths are 3.06 Å. Both Er(2)-Ga(6) bond lengths are 3.11 Å. Both Er(2)-Ga(8) bond lengths are 3.15 Å. In the third Er site, Er(3) is bonded in a 12-coordinate geometry to two equivalent Pt(1), two equivalent Ga(3), two equivalent Ga(5), two equivalent Ga(7), two equivalent Ga(9), and three equivalent Ga(2) atoms. Both Er(3)-Pt(1) bond lengths are 3.04 Å. Both Er(3)-Ga(3) bond lengths are 3.10 Å. Both Er(3)-Ga(5) bond lengths are 3.09 Å. Both Er(3)-Ga(7) bond lengths are 3.06 Å. Both Er(3)-Ga(9) bond lengths are 3.18 Å. There are two shorter (3.08 Å) and one longer (3.44 Å) Er(3)-Ga(2) bond length. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 10-coordinate geometry to two equivalent Er(3), one Ga(5), one Ga(8), two equivalent Ga(2), two equivalent Ga(3), and two equivalent Ga(9) atoms. The Pt(1)-Ga(5) bond length is 2.60 Å. The Pt(1)-Ga(8) bond length is 2.62 Å. Both Pt(1)-Ga(2) bond lengths are 2.74 Å. Both Pt(1)-Ga(3) bond lengths are 2.71 Å. Both Pt(1)-Ga(9) bond lengths are 2.85 Å. In the second Pt site, Pt(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), one Ga(6), one Ga(7), two equivalent Ga(1), and two equivalent Ga(4) atoms. The Pt(2)-Ga(6) bond length is 2.59 Å. The Pt(2)-Ga(7) bond length is 2.57 Å. Both Pt(2)-Ga(1) bond lengths are 2.66 Å. Both Pt(2)-Ga(4) bond lengths are 2.68 Å. In the third Pt site, Pt(3) is bonded in a 8-coordinate geometry to four equivalent Er(2), two equivalent Ga(1), and two equivalent Ga(4) atoms. Both Pt(3)-Ga(1) bond lengths are 2.68 Å. Both Pt(3)-Ga(4) bond lengths are 2.69 Å. There are nine inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Er(2), one Pt(3), two equivalent Pt(2), and three equivalent Ga(6) atoms. There is one shorter (2.65 Å) and two longer (2.66 Å) Ga(1)-Ga(6) bond lengths. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Er(1), three equivalent Er(3), two equivalent Pt(1), one Ga(9), and three equivalent Ga(5) atoms. The Ga(2)-Ga(9) bond length is 2.74 Å. There are two shorter (2.61 Å) and one longer (2.69 Å) Ga(2)-Ga(5) bond length. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), two equivalent Er(3), two equivalent Pt(1), one Ga(7), one Ga(9), and two equivalent Ga(8) atoms. The Ga(3)-Ga(7) bond length is 2.64 Å. The Ga(3)-Ga(9) bond length is 2.72 Å. Both Ga(3)-Ga(8) bond lengths are 2.62 Å. In the fourth Ga site, Ga(4) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Er(2), one Pt(3), two equivalent Pt(2), one Ga(8), and two equivalent Ga(7) atoms. The Ga(4)-Ga(8) bond length is 2.68 Å. Both Ga(4)-Ga(7) bond lengths are 2.65 Å. In the fifth Ga site, Ga(5) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Pt(1), one Ga(7), and three equivalent Ga(2) atoms. The Ga(5)-Ga(7) bond length is 2.52 Å. In the sixth Ga site, Ga(6) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), one Pt(2), one Ga(8), and three equivalent Ga(1) atoms. The Ga(6)-Ga(8) bond length is 2.54 Å. In the seventh Ga site, Ga(7) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Pt(2), one Ga(3), one Ga(5), and two equivalent Ga(4) atoms. In the eighth Ga site, Ga(8) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), one Pt(1), one Ga(4), one Ga(6), and two equivalent Ga(3) atoms. In the ninth Ga site, Ga(9) is bonded to four equivalent Er(3), four equivalent Pt(1), two equivalent Ga(2), and two equivalent Ga(3) atoms to form face-sharing GaEr4Ga4Pt4 cuboctahedra.