EuNdHf4O12 crystallizes in the orthorhombic Amm2 space group. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(4) atoms. Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. Hf(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing HfO6 octahedra. The corner-sharing octahedral tilt angles range from 18-41°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Eu(1) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to one Eu(1), one Nd(1), and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nd(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and two equivalent Hf(1) atoms. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Hf(1) atoms.
EuNdHf4O12 crystallizes in the orthorhombic Amm2 space group. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(4) atoms. Both Eu(1)-O(2) bond lengths are 2.80 Å. All Eu(1)-O(1) bond lengths are 2.44 Å. There are two shorter (2.60 Å) and two longer (3.16 Å) Eu(1)-O(4) bond lengths. Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. Both Nd(1)-O(2) bond lengths are 2.74 Å. Both Nd(1)-O(3) bond lengths are 2.36 Å. Both Nd(1)-O(5) bond lengths are 2.30 Å. Hf(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing HfO6 octahedra. The corner-sharing octahedral tilt angles range from 18-41°. The Hf(1)-O(2) bond length is 2.12 Å. The Hf(1)-O(3) bond length is 2.05 Å. The Hf(1)-O(4) bond length is 2.05 Å. The Hf(1)-O(5) bond length is 2.09 Å. There is one shorter (2.08 Å) and one longer (2.09 Å) Hf(1)-O(1) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Eu(1) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to one Eu(1), one Nd(1), and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nd(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and two equivalent Hf(1) atoms. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Hf(1) atoms.