SrCaEuBiO6 crystallizes in the orthorhombic P222 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted square co-planar geometry to four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent O(6) atoms. In the third Sr site, Sr(3) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(4) atoms. In the fourth Sr site, Sr(4) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(5) atoms. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. In the second Ca site, Ca(2) is bonded in a square co-planar geometry to four equivalent O(1) atoms. In the third Ca site, Ca(3) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form CaO12 cuboctahedra that share faces with four equivalent Eu(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form CaO12 cuboctahedra that share faces with four equivalent Eu(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. Eu(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form EuO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra,  a faceface with one Ca(3)O12 cuboctahedra, and  a faceface with one Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-34°. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form BiO6 octahedra that share corners with six equivalent Eu(1)O6 octahedra,  a faceface with one Ca(3)O12 cuboctahedra, and  a faceface with one Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-34°. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(4), one Ca(4), one Eu(1), and one Bi(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one Ca(4), one Eu(1), and one Bi(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Ca(2), one Ca(3), one Eu(1), and one Bi(1) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(3), one Eu(1), and one Bi(1) atom. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Ca(3), one Eu(1), and one Bi(1) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(3), one Ca(4), one Eu(1), and one Bi(1) atom.
SrCaEuBiO6 crystallizes in the orthorhombic P222 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted square co-planar geometry to four equivalent O(5) atoms. All Sr(1)-O(5) bond lengths are 2.51 Å. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent O(6) atoms. All Sr(2)-O(6) bond lengths are 2.49 Å. In the third Sr site, Sr(3) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(4) atoms. All Sr(3)-O(3) bond lengths are 3.17 Å. All Sr(3)-O(4) bond lengths are 2.50 Å. In the fourth Sr site, Sr(4) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(5) atoms. All Sr(4)-O(3) bond lengths are 2.49 Å. All Sr(4)-O(5) bond lengths are 3.12 Å. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. All Ca(1)-O(2) bond lengths are 2.38 Å. In the second Ca site, Ca(2) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Ca(2)-O(1) bond lengths are 2.38 Å. In the third Ca site, Ca(3) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form CaO12 cuboctahedra that share faces with four equivalent Eu(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. All Ca(3)-O(1) bond lengths are 3.00 Å. All Ca(3)-O(2) bond lengths are 3.02 Å. All Ca(3)-O(3) bond lengths are 2.97 Å. In the fourth Ca site, Ca(4) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form CaO12 cuboctahedra that share faces with four equivalent Eu(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. All Ca(4)-O(4) bond lengths are 2.97 Å. All Ca(4)-O(5) bond lengths are 3.01 Å. All Ca(4)-O(6) bond lengths are 2.99 Å. Eu(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form EuO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra,  a faceface with one Ca(3)O12 cuboctahedra, and  a faceface with one Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-34°. The Eu(1)-O(1) bond length is 2.31 Å. The Eu(1)-O(2) bond length is 2.29 Å. The Eu(1)-O(3) bond length is 2.28 Å. The Eu(1)-O(4) bond length is 2.28 Å. The Eu(1)-O(5) bond length is 2.30 Å. The Eu(1)-O(6) bond length is 2.27 Å. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form BiO6 octahedra that share corners with six equivalent Eu(1)O6 octahedra,  a faceface with one Ca(3)O12 cuboctahedra, and  a faceface with one Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-34°. The Bi(1)-O(1) bond length is 2.15 Å. The Bi(1)-O(2) bond length is 2.14 Å. The Bi(1)-O(3) bond length is 2.13 Å. The Bi(1)-O(4) bond length is 2.13 Å. The Bi(1)-O(5) bond length is 2.14 Å. The Bi(1)-O(6) bond length is 2.13 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(4), one Ca(4), one Eu(1), and one Bi(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one Ca(4), one Eu(1), and one Bi(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Ca(2), one Ca(3), one Eu(1), and one Bi(1) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(3), one Eu(1), and one Bi(1) atom. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Ca(3), one Eu(1), and one Bi(1) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(3), one Ca(4), one Eu(1), and one Bi(1) atom.