CaEuHf4O12 crystallizes in the orthorhombic Amm2 space group. Ca(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(4) atoms. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four 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 23-35°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Eu(1) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Ca(1) and two equivalent Hf(1) atoms. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Eu(1) and two equivalent Hf(1) atoms.
CaEuHf4O12 crystallizes in the orthorhombic Amm2 space group. Ca(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Ca(1)-O(3) bond lengths are 2.33 Å. Both Ca(1)-O(4) bond lengths are 2.38 Å. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(5) atoms. Both Eu(1)-O(2) bond lengths are 2.72 Å. All Eu(1)-O(1) bond lengths are 2.55 Å. There are two shorter (2.75 Å) and two longer (2.95 Å) Eu(1)-O(5) bond lengths. 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 23-35°. The Hf(1)-O(2) bond length is 2.05 Å. The Hf(1)-O(3) bond length is 2.06 Å. The Hf(1)-O(4) bond length is 2.06 Å. The Hf(1)-O(5) bond length is 2.05 Å. Both Hf(1)-O(1) bond lengths are 2.05 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Eu(1) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Ca(1) and two equivalent Hf(1) atoms. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Eu(1) and two equivalent Hf(1) atoms.