SrCaHf4O12 crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(5) atoms. Ca(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) 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 9-35°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Ca(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 linear geometry to two equivalent Sr(1) and two equivalent Hf(1) atoms.
SrCaHf4O12 crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(5) atoms. Both Sr(1)-O(2) bond lengths are 2.75 Å. All Sr(1)-O(1) bond lengths are 2.61 Å. There are two shorter (2.85 Å) and two longer (2.95 Å) Sr(1)-O(5) bond lengths. Ca(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Ca(1)-O(2) bond lengths are 2.74 Å. Both Ca(1)-O(3) bond lengths are 2.41 Å. Both Ca(1)-O(4) bond lengths are 2.36 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 9-35°. The Hf(1)-O(2) bond length is 2.16 Å. The Hf(1)-O(3) bond length is 2.03 Å. The Hf(1)-O(4) bond length is 2.06 Å. The Hf(1)-O(5) bond length is 2.10 Å. Both Hf(1)-O(1) bond lengths are 2.07 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Ca(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 linear geometry to two equivalent Sr(1) and two equivalent Hf(1) atoms.