ErMnGa crystallizes in the orthorhombic Ima2 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to two equivalent Mn(1), one Ga(1), and four equivalent Ga(2) atoms. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to two equivalent Mn(1), one Ga(1), and four equivalent Ga(2) atoms. In the third Er site, Er(3) is bonded in a 11-coordinate geometry to two equivalent Mn(1), four equivalent Mn(2), one Ga(1), and four equivalent Ga(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent Er(1), two equivalent Er(2), two equivalent Er(3), two equivalent Mn(2), two equivalent Ga(1), and two equivalent Ga(2) atoms to form distorted face-sharing MnEr6Mn2Ga4 cuboctahedra. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to two equivalent Er(3), one Mn(1), two equivalent Ga(1), and two equivalent Ga(2) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Er(1), one Er(2), one Er(3), two equivalent Mn(1), and four equivalent Mn(2) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Er(3), one Mn(1), and two equivalent Mn(2) atoms.
ErMnGa crystallizes in the orthorhombic Ima2 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to two equivalent Mn(1), one Ga(1), and four equivalent Ga(2) atoms. Both Er(1)-Mn(1) bond lengths are 3.36 Å. The Er(1)-Ga(1) bond length is 2.93 Å. There are two shorter (2.92 Å) and two longer (2.96 Å) Er(1)-Ga(2) bond lengths. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to two equivalent Mn(1), one Ga(1), and four equivalent Ga(2) atoms. Both Er(2)-Mn(1) bond lengths are 3.21 Å. The Er(2)-Ga(1) bond length is 2.94 Å. There are two shorter (2.93 Å) and two longer (2.96 Å) Er(2)-Ga(2) bond lengths. In the third Er site, Er(3) is bonded in a 11-coordinate geometry to two equivalent Mn(1), four equivalent Mn(2), one Ga(1), and four equivalent Ga(2) atoms. Both Er(3)-Mn(1) bond lengths are 3.17 Å. There are two shorter (3.11 Å) and two longer (3.22 Å) Er(3)-Mn(2) bond lengths. The Er(3)-Ga(1) bond length is 3.01 Å. There are two shorter (2.94 Å) and two longer (2.97 Å) Er(3)-Ga(2) bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent Er(1), two equivalent Er(2), two equivalent Er(3), two equivalent Mn(2), two equivalent Ga(1), and two equivalent Ga(2) atoms to form distorted face-sharing MnEr6Mn2Ga4 cuboctahedra. Both Mn(1)-Mn(2) bond lengths are 2.89 Å. Both Mn(1)-Ga(1) bond lengths are 2.66 Å. Both Mn(1)-Ga(2) bond lengths are 2.79 Å. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to two equivalent Er(3), one Mn(1), two equivalent Ga(1), and two equivalent Ga(2) atoms. There is one shorter (2.62 Å) and one longer (2.65 Å) Mn(2)-Ga(1) bond length. Both Mn(2)-Ga(2) bond lengths are 2.76 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Er(1), one Er(2), one Er(3), two equivalent Mn(1), and four equivalent Mn(2) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Er(3), one Mn(1), and two equivalent Mn(2) atoms.