ErGd3Ni4 crystallizes in the orthorhombic Pmm2 space group. Er(1) is bonded in a 7-coordinate geometry to one Ni(1), two equivalent Ni(2), and four equivalent Ni(3) atoms. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 7-coordinate geometry to one Ni(2), two equivalent Ni(1), and four equivalent Ni(4) atoms. In the second Gd site, Gd(2) is bonded in a 7-coordinate geometry to one Ni(3), two equivalent Ni(4), and four equivalent Ni(1) atoms. In the third Gd site, Gd(3) is bonded in a 7-coordinate geometry to one Ni(4), two equivalent Ni(3), and four equivalent Ni(2) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Gd(1), four equivalent Gd(2), and two equivalent Ni(4) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Gd(1), four equivalent Gd(3), and two equivalent Ni(3) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to four equivalent Er(1), one Gd(2), two equivalent Gd(3), and two equivalent Ni(2) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to one Gd(3), two equivalent Gd(2), four equivalent Gd(1), and two equivalent Ni(1) atoms.
ErGd3Ni4 crystallizes in the orthorhombic Pmm2 space group. Er(1) is bonded in a 7-coordinate geometry to one Ni(1), two equivalent Ni(2), and four equivalent Ni(3) atoms. The Er(1)-Ni(1) bond length is 2.94 Å. Both Er(1)-Ni(2) bond lengths are 2.79 Å. All Er(1)-Ni(3) bond lengths are 2.88 Å. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 7-coordinate geometry to one Ni(2), two equivalent Ni(1), and four equivalent Ni(4) atoms. The Gd(1)-Ni(2) bond length is 3.01 Å. Both Gd(1)-Ni(1) bond lengths are 2.85 Å. All Gd(1)-Ni(4) bond lengths are 2.90 Å. In the second Gd site, Gd(2) is bonded in a 7-coordinate geometry to one Ni(3), two equivalent Ni(4), and four equivalent Ni(1) atoms. The Gd(2)-Ni(3) bond length is 2.88 Å. Both Gd(2)-Ni(4) bond lengths are 2.86 Å. All Gd(2)-Ni(1) bond lengths are 2.90 Å. In the third Gd site, Gd(3) is bonded in a 7-coordinate geometry to one Ni(4), two equivalent Ni(3), and four equivalent Ni(2) atoms. The Gd(3)-Ni(4) bond length is 3.00 Å. Both Gd(3)-Ni(3) bond lengths are 2.84 Å. All Gd(3)-Ni(2) bond lengths are 2.90 Å. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Gd(1), four equivalent Gd(2), and two equivalent Ni(4) atoms. Both Ni(1)-Ni(4) bond lengths are 2.55 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Er(1), one Gd(1), four equivalent Gd(3), and two equivalent Ni(3) atoms. Both Ni(2)-Ni(3) bond lengths are 2.53 Å. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to four equivalent Er(1), one Gd(2), two equivalent Gd(3), and two equivalent Ni(2) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to one Gd(3), two equivalent Gd(2), four equivalent Gd(1), and two equivalent Ni(1) atoms.