BaSrEuSeO6 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(5), two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form SrO6 octahedra that share corners with two equivalent Se(2)O6 octahedra and corners with four equivalent Se(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-26°. In the second Sr site, Sr(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form SrO6 octahedra that share corners with two equivalent Se(1)O6 octahedra and corners with four equivalent Se(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-29°. Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form SeO6 octahedra that share corners with two equivalent Sr(2)O6 octahedra and corners with four equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-29°. In the second Se site, Se(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form SeO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra and corners with four equivalent Sr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-27°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Sr(1), one Eu(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Sr(2), two equivalent Eu(1), and one Se(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Sr(1), two equivalent Eu(1), and one Se(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Sr(2), one Eu(1), and one Se(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Sr(1), one Eu(1), and one Se(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Sr(2), one Eu(1), and one Se(1) atom.
BaSrEuSeO6 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(5), two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms. The Ba(1)-O(2) bond length is 2.88 Å. The Ba(1)-O(3) bond length is 2.83 Å. The Ba(1)-O(5) bond length is 2.71 Å. There is one shorter (2.65 Å) and one longer (3.05 Å) Ba(1)-O(1) bond length. There is one shorter (2.70 Å) and one longer (2.93 Å) Ba(1)-O(4) bond length. There is one shorter (2.91 Å) and one longer (3.17 Å) Ba(1)-O(6) bond length. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form SrO6 octahedra that share corners with two equivalent Se(2)O6 octahedra and corners with four equivalent Se(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-26°. Both Sr(1)-O(1) bond lengths are 2.41 Å. Both Sr(1)-O(3) bond lengths are 2.45 Å. Both Sr(1)-O(5) bond lengths are 2.41 Å. In the second Sr site, Sr(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form SrO6 octahedra that share corners with two equivalent Se(1)O6 octahedra and corners with four equivalent Se(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-29°. Both Sr(2)-O(2) bond lengths are 2.44 Å. Both Sr(2)-O(4) bond lengths are 2.39 Å. Both Sr(2)-O(6) bond lengths are 2.45 Å. Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. The Eu(1)-O(1) bond length is 2.78 Å. The Eu(1)-O(4) bond length is 2.82 Å. The Eu(1)-O(5) bond length is 2.50 Å. The Eu(1)-O(6) bond length is 2.52 Å. There is one shorter (2.64 Å) and one longer (2.86 Å) Eu(1)-O(2) bond length. There is one shorter (2.59 Å) and one longer (3.12 Å) Eu(1)-O(3) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form SeO6 octahedra that share corners with two equivalent Sr(2)O6 octahedra and corners with four equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-29°. Both Se(1)-O(1) bond lengths are 1.85 Å. Both Se(1)-O(3) bond lengths are 1.87 Å. Both Se(1)-O(6) bond lengths are 1.87 Å. In the second Se site, Se(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form SeO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra and corners with four equivalent Sr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-27°. Both Se(2)-O(2) bond lengths are 1.88 Å. Both Se(2)-O(4) bond lengths are 1.85 Å. Both Se(2)-O(5) bond lengths are 1.85 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Sr(1), one Eu(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Sr(2), two equivalent Eu(1), and one Se(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Sr(1), two equivalent Eu(1), and one Se(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Sr(2), one Eu(1), and one Se(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Sr(1), one Eu(1), and one Se(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Sr(2), one Eu(1), and one Se(1) atom.