BaEuCeNbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. Ba(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. Eu(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(1), and two equivalent O(4) atoms. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form CeO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-29°. In the second Ce site, Ce(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form CeO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra and corners with four equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-30°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form NbO6 octahedra that share corners with two equivalent Ce(2)O6 octahedra and corners with four equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-30°. In the second Nb site, Nb(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form NbO6 octahedra that share corners with two equivalent Ce(1)O6 octahedra and corners with four equivalent Ce(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-29°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Eu(1), one Ce(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Eu(1), one Ce(2), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Eu(1), one Ce(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Eu(1), one Ce(2), and one Nb(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Eu(1), one Ce(2), and one Nb(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Eu(1), one Ce(1), and one Nb(2) atom.
BaEuCeNbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. Ba(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 Ba(1)-O(1) bond length is 2.95 Å. The Ba(1)-O(4) bond length is 2.98 Å. The Ba(1)-O(5) bond length is 2.88 Å. The Ba(1)-O(6) bond length is 2.73 Å. There is one shorter (2.71 Å) and one longer (3.11 Å) Ba(1)-O(2) bond length. There is one shorter (2.70 Å) and one longer (3.07 Å) Ba(1)-O(3) bond length. Eu(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(1), and two equivalent O(4) atoms. The Eu(1)-O(2) bond length is 2.85 Å. The Eu(1)-O(3) bond length is 2.89 Å. The Eu(1)-O(5) bond length is 2.57 Å. The Eu(1)-O(6) bond length is 2.66 Å. There is one shorter (2.64 Å) and one longer (3.09 Å) Eu(1)-O(1) bond length. There is one shorter (2.66 Å) and one longer (2.98 Å) Eu(1)-O(4) bond length. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form CeO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-29°. Both Ce(1)-O(1) bond lengths are 2.40 Å. Both Ce(1)-O(3) bond lengths are 2.38 Å. Both Ce(1)-O(6) bond lengths are 2.37 Å. In the second Ce site, Ce(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form CeO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra and corners with four equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-30°. Both Ce(2)-O(2) bond lengths are 2.37 Å. Both Ce(2)-O(4) bond lengths are 2.40 Å. Both Ce(2)-O(5) bond lengths are 2.40 Å. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form NbO6 octahedra that share corners with two equivalent Ce(2)O6 octahedra and corners with four equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-30°. Both Nb(1)-O(1) bond lengths are 2.08 Å. Both Nb(1)-O(3) bond lengths are 2.07 Å. Both Nb(1)-O(5) bond lengths are 2.08 Å. In the second Nb site, Nb(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form NbO6 octahedra that share corners with two equivalent Ce(1)O6 octahedra and corners with four equivalent Ce(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-29°. Both Nb(2)-O(2) bond lengths are 2.06 Å. Both Nb(2)-O(4) bond lengths are 2.08 Å. Both Nb(2)-O(6) bond lengths are 2.06 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Eu(1), one Ce(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Eu(1), one Ce(2), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Eu(1), one Ce(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Eu(1), one Ce(2), and one Nb(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Eu(1), one Ce(2), and one Nb(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Eu(1), one Ce(1), and one Nb(2) atom.