SrCaEuSbO6 crystallizes in the tetragonal P-4n2 space group. Sr(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Ca(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form CaO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-34°. Eu(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Sb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form SbO6 octahedra that share corners with six equivalent Ca(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-34°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Ca(1), two equivalent Eu(1), and one Sb(1) atom to form distorted OSr2CaEu2Sb octahedra that share corners with six equivalent O(1)Sr2CaEu2Sb octahedra, corners with eight equivalent O(2)SrCaEuSb tetrahedra, edges with four equivalent O(1)Sr2CaEu2Sb octahedra, and edges with eight equivalent O(2)SrCaEuSb tetrahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the second O site, O(2) is bonded to one Sr(1), one Ca(1), one Eu(1), and one Sb(1) atom to form distorted OSrCaEuSb tetrahedra that share corners with four equivalent O(1)Sr2CaEu2Sb octahedra, corners with ten equivalent O(2)SrCaEuSb tetrahedra, edges with four equivalent O(1)Sr2CaEu2Sb octahedra, and  an edgeedge with one O(2)SrCaEuSb tetrahedra. The corner-sharing octahedral tilt angles range from 65-68°.
SrCaEuSbO6 crystallizes in the tetragonal P-4n2 space group. Sr(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. All Sr(1)-O(1) bond lengths are 2.91 Å. All Sr(1)-O(2) bond lengths are 2.65 Å. Ca(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form CaO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-34°. Both Ca(1)-O(1) bond lengths are 2.23 Å. All Ca(1)-O(2) bond lengths are 2.30 Å. Eu(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. All Eu(1)-O(1) bond lengths are 2.91 Å. All Eu(1)-O(2) bond lengths are 2.47 Å. Sb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form SbO6 octahedra that share corners with six equivalent Ca(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-34°. Both Sb(1)-O(1) bond lengths are 2.00 Å. All Sb(1)-O(2) bond lengths are 2.01 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Ca(1), two equivalent Eu(1), and one Sb(1) atom to form distorted OSr2CaEu2Sb octahedra that share corners with six equivalent O(1)Sr2CaEu2Sb octahedra, corners with eight equivalent O(2)SrCaEuSb tetrahedra, edges with four equivalent O(1)Sr2CaEu2Sb octahedra, and edges with eight equivalent O(2)SrCaEuSb tetrahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the second O site, O(2) is bonded to one Sr(1), one Ca(1), one Eu(1), and one Sb(1) atom to form distorted OSrCaEuSb tetrahedra that share corners with four equivalent O(1)Sr2CaEu2Sb octahedra, corners with ten equivalent O(2)SrCaEuSb tetrahedra, edges with four equivalent O(1)Sr2CaEu2Sb octahedra, and  an edgeedge with one O(2)SrCaEuSb tetrahedra. The corner-sharing octahedral tilt angles range from 65-68°.