Er3Ni13B2 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 18-coordinate geometry to four equivalent Ni(4), eight equivalent Ni(5), and six equivalent B(1) atoms. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to two equivalent Ni(1), two equivalent Ni(4), four equivalent Ni(2), four equivalent Ni(5), and six equivalent Ni(3) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Er(2), four equivalent Ni(2), and four equivalent Ni(3) atoms to form a mixture of edge, face, and corner-sharing NiEr4Ni8 cuboctahedra. In the second Ni site, Ni(2) is bonded to four equivalent Er(2), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(3) atoms to form a mixture of edge, face, and corner-sharing NiEr4Ni8 cuboctahedra. In the third Ni site, Ni(3) is bonded in a 12-coordinate geometry to three equivalent Er(2), one Ni(1), one Ni(4), two equivalent Ni(2), two equivalent Ni(5), and three equivalent Ni(3) atoms. In the fourth Ni site, Ni(4) is bonded in a distorted L-shaped geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Ni(3), and two equivalent B(1) atoms. In the fifth Ni site, Ni(5) is bonded in a distorted L-shaped geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Ni(3), and two equivalent B(1) atoms. B(1) is bonded in a 6-coordinate geometry to three equivalent Er(1), two equivalent Ni(4), and four equivalent Ni(5) atoms.
Er3Ni13B2 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 18-coordinate geometry to four equivalent Ni(4), eight equivalent Ni(5), and six equivalent B(1) atoms. All Er(1)-Ni(4) bond lengths are 2.85 Å. All Er(1)-Ni(5) bond lengths are 2.86 Å. There are four shorter (2.83 Å) and two longer (2.85 Å) Er(1)-B(1) bond lengths. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to two equivalent Ni(1), two equivalent Ni(4), four equivalent Ni(2), four equivalent Ni(5), and six equivalent Ni(3) atoms. Both Er(2)-Ni(1) bond lengths are 3.08 Å. Both Er(2)-Ni(4) bond lengths are 3.25 Å. All Er(2)-Ni(2) bond lengths are 3.09 Å. All Er(2)-Ni(5) bond lengths are 3.25 Å. There are four shorter (2.84 Å) and two longer (2.85 Å) Er(2)-Ni(3) bond lengths. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Er(2), four equivalent Ni(2), and four equivalent Ni(3) atoms to form a mixture of edge, face, and corner-sharing NiEr4Ni8 cuboctahedra. All Ni(1)-Ni(2) bond lengths are 2.46 Å. All Ni(1)-Ni(3) bond lengths are 2.43 Å. In the second Ni site, Ni(2) is bonded to four equivalent Er(2), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(3) atoms to form a mixture of edge, face, and corner-sharing NiEr4Ni8 cuboctahedra. Both Ni(2)-Ni(2) bond lengths are 2.45 Å. All Ni(2)-Ni(3) bond lengths are 2.43 Å. In the third Ni site, Ni(3) is bonded in a 12-coordinate geometry to three equivalent Er(2), one Ni(1), one Ni(4), two equivalent Ni(2), two equivalent Ni(5), and three equivalent Ni(3) atoms. The Ni(3)-Ni(4) bond length is 2.47 Å. Both Ni(3)-Ni(5) bond lengths are 2.47 Å. There are two shorter (2.83 Å) and one longer (2.85 Å) Ni(3)-Ni(3) bond length. In the fourth Ni site, Ni(4) is bonded in a distorted L-shaped geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Ni(3), and two equivalent B(1) atoms. Both Ni(4)-B(1) bond lengths are 2.04 Å. In the fifth Ni site, Ni(5) is bonded in a distorted L-shaped geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Ni(3), and two equivalent B(1) atoms. Both Ni(5)-B(1) bond lengths are 2.04 Å. B(1) is bonded in a 6-coordinate geometry to three equivalent Er(1), two equivalent Ni(4), and four equivalent Ni(5) atoms.