SrEuHf4O12 crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(5) atoms. Eu(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(1) 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 18-29°. 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 2-coordinate geometry to one Eu(1) and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one 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 Sr(1) and two equivalent Hf(1) atoms.
SrEuHf4O12 crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(5) atoms. Both Sr(1)-O(3) bond lengths are 2.46 Å. Both Sr(1)-O(5) bond lengths are 2.51 Å. Eu(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms. Both Eu(1)-O(2) bond lengths are 2.77 Å. Both Eu(1)-O(4) bond lengths are 2.64 Å. All Eu(1)-O(1) bond lengths are 2.49 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 18-29°. The Hf(1)-O(2) bond length is 2.11 Å. The Hf(1)-O(3) bond length is 2.03 Å. The Hf(1)-O(4) bond length is 2.07 Å. The Hf(1)-O(5) bond length is 2.06 Å. Both Hf(1)-O(1) bond lengths are 2.08 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 2-coordinate geometry to one Eu(1) and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one 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 Sr(1) and two equivalent Hf(1) atoms.