Ba2CeNbO6 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 12-coordinate geometry to four equivalent O(1) and eight equivalent O(2) atoms. Ce(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form CeO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-17°. Nb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NbO6 octahedra that share corners with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-17°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent Ba(1), one Ce(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to four equivalent Ba(1), one Ce(1), and one Nb(1) atom.
Ba2CeNbO6 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 12-coordinate geometry to four equivalent O(1) and eight equivalent O(2) atoms. There are a spread of Ba(1)-O(1) bond distances ranging from 2.78-3.39 Å. There are a spread of Ba(1)-O(2) bond distances ranging from 2.87-3.27 Å. Ce(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form CeO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-17°. Both Ce(1)-O(1) bond lengths are 2.31 Å. All Ce(1)-O(2) bond lengths are 2.31 Å. Nb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NbO6 octahedra that share corners with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-17°. Both Nb(1)-O(1) bond lengths are 2.05 Å. All Nb(1)-O(2) bond lengths are 2.06 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent Ba(1), one Ce(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to four equivalent Ba(1), one Ce(1), and one Nb(1) atom.