AlNiEr crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to three equivalent Er(2), one Ni(3), two equivalent Ni(1), two equivalent Ni(2), three equivalent Al(1), and four equivalent Al(2) atoms. In the second Er site, Er(2) is bonded in a 16-coordinate geometry to one Er(2), three equivalent Er(1), one Ni(1), two equivalent Ni(3), four equivalent Ni(2), two equivalent Al(2), and three equivalent Al(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Er(2), four equivalent Er(1), two equivalent Al(1), and four equivalent Al(2) atoms to form NiEr6Al6 cuboctahedra that share corners with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with four equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with eight equivalent Ni(2)Er6Al2Ni4 cuboctahedra, edges with two equivalent Ni(1)Er6Al6 cuboctahedra, edges with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, faces with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra, and faces with eight equivalent Al(2)Er6Al4Ni2 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Er(1), four equivalent Er(2), two equivalent Ni(2), two equivalent Ni(3), and two equivalent Al(1) atoms to form distorted NiEr6Al2Ni4 cuboctahedra that share corners with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, corners with four equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with six equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with two equivalent Ni(2)Er6Al2Ni4 cuboctahedra, edges with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, faces with two equivalent Ni(1)Er6Al6 cuboctahedra, faces with two equivalent Al(2)Er6Al4Ni2 cuboctahedra, faces with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, and faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra. In the third Ni site, Ni(3) is bonded to two equivalent Er(1), four equivalent Er(2), four equivalent Ni(2), and two equivalent Al(1) atoms to form distorted NiEr6Al2Ni4 cuboctahedra that share corners with two equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with eight equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, edges with four equivalent Ni(1)Er6Al6 cuboctahedra, faces with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Er6Al2Ni4 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to three equivalent Er(1), three equivalent Er(2), one Ni(1), one Ni(3), two equivalent Ni(2), and two equivalent Al(2) atoms to form distorted AlEr6Al2Ni4 cuboctahedra that share corners with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with two equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with six equivalent Al(1)Er6Al2Ni4 cuboctahedra, faces with two equivalent Al(1)Er6Al2Ni4 cuboctahedra, faces with three equivalent Ni(3)Er6Al2Ni4 cuboctahedra, faces with three equivalent Ni(1)Er6Al6 cuboctahedra, faces with six equivalent Ni(2)Er6Al2Ni4 cuboctahedra, and faces with six equivalent Al(2)Er6Al4Ni2 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent Er(2), four equivalent Er(1), two equivalent Ni(1), two equivalent Al(1), and two equivalent Al(2) atoms to form distorted AlEr6Al4Ni2 cuboctahedra that share corners with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, corners with six equivalent Ni(2)Er6Al2Ni4 cuboctahedra, edges with two equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with two equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, faces with four equivalent Ni(1)Er6Al6 cuboctahedra, faces with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, and faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra.
AlNiEr crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to three equivalent Er(2), one Ni(3), two equivalent Ni(1), two equivalent Ni(2), three equivalent Al(1), and four equivalent Al(2) atoms. There are two shorter (3.24 Å) and one longer (3.26 Å) Er(1)-Er(2) bond length. The Er(1)-Ni(3) bond length is 2.93 Å. Both Er(1)-Ni(1) bond lengths are 3.19 Å. Both Er(1)-Ni(2) bond lengths are 2.94 Å. There are two shorter (3.11 Å) and one longer (3.14 Å) Er(1)-Al(1) bond length. There are two shorter (3.16 Å) and two longer (3.19 Å) Er(1)-Al(2) bond lengths. In the second Er site, Er(2) is bonded in a 16-coordinate geometry to one Er(2), three equivalent Er(1), one Ni(1), two equivalent Ni(3), four equivalent Ni(2), two equivalent Al(2), and three equivalent Al(1) atoms. The Er(2)-Er(2) bond length is 2.98 Å. The Er(2)-Ni(1) bond length is 3.12 Å. Both Er(2)-Ni(3) bond lengths are 3.07 Å. There are two shorter (3.03 Å) and two longer (3.07 Å) Er(2)-Ni(2) bond lengths. Both Er(2)-Al(2) bond lengths are 3.14 Å. There is one shorter (3.04 Å) and two longer (3.17 Å) Er(2)-Al(1) bond lengths. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Er(2), four equivalent Er(1), two equivalent Al(1), and four equivalent Al(2) atoms to form NiEr6Al6 cuboctahedra that share corners with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with four equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with eight equivalent Ni(2)Er6Al2Ni4 cuboctahedra, edges with two equivalent Ni(1)Er6Al6 cuboctahedra, edges with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, faces with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra, and faces with eight equivalent Al(2)Er6Al4Ni2 cuboctahedra. Both Ni(1)-Al(1) bond lengths are 2.68 Å. There are two shorter (2.61 Å) and two longer (2.71 Å) Ni(1)-Al(2) bond lengths. In the second Ni site, Ni(2) is bonded to two equivalent Er(1), four equivalent Er(2), two equivalent Ni(2), two equivalent Ni(3), and two equivalent Al(1) atoms to form distorted NiEr6Al2Ni4 cuboctahedra that share corners with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, corners with four equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with six equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with two equivalent Ni(2)Er6Al2Ni4 cuboctahedra, edges with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, faces with two equivalent Ni(1)Er6Al6 cuboctahedra, faces with two equivalent Al(2)Er6Al4Ni2 cuboctahedra, faces with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, and faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra. There is one shorter (2.66 Å) and one longer (2.71 Å) Ni(2)-Ni(2) bond length. There is one shorter (2.64 Å) and one longer (2.68 Å) Ni(2)-Ni(3) bond length. Both Ni(2)-Al(1) bond lengths are 2.53 Å. In the third Ni site, Ni(3) is bonded to two equivalent Er(1), four equivalent Er(2), four equivalent Ni(2), and two equivalent Al(1) atoms to form distorted NiEr6Al2Ni4 cuboctahedra that share corners with two equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with eight equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, edges with four equivalent Ni(1)Er6Al6 cuboctahedra, faces with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Er6Al2Ni4 cuboctahedra. Both Ni(3)-Al(1) bond lengths are 2.55 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to three equivalent Er(1), three equivalent Er(2), one Ni(1), one Ni(3), two equivalent Ni(2), and two equivalent Al(2) atoms to form distorted AlEr6Al2Ni4 cuboctahedra that share corners with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with two equivalent Ni(1)Er6Al6 cuboctahedra, corners with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with six equivalent Al(1)Er6Al2Ni4 cuboctahedra, faces with two equivalent Al(1)Er6Al2Ni4 cuboctahedra, faces with three equivalent Ni(3)Er6Al2Ni4 cuboctahedra, faces with three equivalent Ni(1)Er6Al6 cuboctahedra, faces with six equivalent Ni(2)Er6Al2Ni4 cuboctahedra, and faces with six equivalent Al(2)Er6Al4Ni2 cuboctahedra. Both Al(1)-Al(2) bond lengths are 2.74 Å. In the second Al site, Al(2) is bonded to two equivalent Er(2), four equivalent Er(1), two equivalent Ni(1), two equivalent Al(1), and two equivalent Al(2) atoms to form distorted AlEr6Al4Ni2 cuboctahedra that share corners with four equivalent Ni(3)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(1)Er6Al2Ni4 cuboctahedra, corners with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, corners with six equivalent Ni(2)Er6Al2Ni4 cuboctahedra, edges with two equivalent Al(2)Er6Al4Ni2 cuboctahedra, edges with four equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with two equivalent Ni(2)Er6Al2Ni4 cuboctahedra, faces with two equivalent Ni(3)Er6Al2Ni4 cuboctahedra, faces with four equivalent Ni(1)Er6Al6 cuboctahedra, faces with four equivalent Al(2)Er6Al4Ni2 cuboctahedra, and faces with six equivalent Al(1)Er6Al2Ni4 cuboctahedra. There is one shorter (2.63 Å) and one longer (2.74 Å) Al(2)-Al(2) bond length.