ErVB4 crystallizes in the orthorhombic Pbam space group. Er(1) is bonded in a 14-coordinate geometry to two equivalent B(4), four equivalent B(1), four equivalent B(2), and four equivalent B(3) atoms. V(1) is bonded in a 10-coordinate geometry to two equivalent B(1), two equivalent B(2), two equivalent B(3), and four equivalent B(4) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Er(1), two equivalent V(1), one B(2), and two equivalent B(3) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Er(1), two equivalent V(1), one B(1), one B(2), and one B(4) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Er(1), two equivalent V(1), one B(4), and two equivalent B(1) atoms. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent V(1), one B(2), one B(3), and one B(4) atom.
ErVB4 crystallizes in the orthorhombic Pbam space group. Er(1) is bonded in a 14-coordinate geometry to two equivalent B(4), four equivalent B(1), four equivalent B(2), and four equivalent B(3) atoms. Both Er(1)-B(4) bond lengths are 2.61 Å. There are two shorter (2.67 Å) and two longer (2.72 Å) Er(1)-B(1) bond lengths. There are two shorter (2.69 Å) and two longer (2.73 Å) Er(1)-B(2) bond lengths. There are two shorter (2.64 Å) and two longer (2.76 Å) Er(1)-B(3) bond lengths. V(1) is bonded in a 10-coordinate geometry to two equivalent B(1), two equivalent B(2), two equivalent B(3), and four equivalent B(4) atoms. Both V(1)-B(1) bond lengths are 2.29 Å. Both V(1)-B(2) bond lengths are 2.30 Å. Both V(1)-B(3) bond lengths are 2.31 Å. There are two shorter (2.28 Å) and two longer (2.29 Å) V(1)-B(4) bond lengths. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to four equivalent Er(1), two equivalent V(1), one B(2), and two equivalent B(3) atoms. The B(1)-B(2) bond length is 1.84 Å. There is one shorter (1.81 Å) and one longer (1.86 Å) B(1)-B(3) bond length. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Er(1), two equivalent V(1), one B(1), one B(2), and one B(4) atom. The B(2)-B(2) bond length is 1.78 Å. The B(2)-B(4) bond length is 1.76 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Er(1), two equivalent V(1), one B(4), and two equivalent B(1) atoms. The B(3)-B(4) bond length is 1.77 Å. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent V(1), one B(2), one B(3), and one B(4) atom. The B(4)-B(4) bond length is 1.77 Å.