Ba2PrNbO6 crystallizes in the cubic Pn-3 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to twelve equivalent O(1) atoms to form BaO12 cuboctahedra that share faces with four equivalent Pr(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. In the second Ba site, Ba(2) is bonded in a 12-coordinate geometry to twelve equivalent O(1) atoms. Pr(1) is bonded to six equivalent O(1) atoms to form PrO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and faces with two equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 17°. Nb(1) is bonded to six equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Pr(1)O6 octahedra and faces with two equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 17°. O(1) is bonded in a 3-coordinate geometry to one Ba(1), three equivalent Ba(2), one Pr(1), and one Nb(1) atom.
Ba2PrNbO6 crystallizes in the cubic Pn-3 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to twelve equivalent O(1) atoms to form BaO12 cuboctahedra that share faces with four equivalent Pr(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. All Ba(1)-O(1) bond lengths are 3.09 Å. In the second Ba site, Ba(2) is bonded in a 12-coordinate geometry to twelve equivalent O(1) atoms. There are a spread of Ba(2)-O(1) bond distances ranging from 2.77-3.41 Å. Pr(1) is bonded to six equivalent O(1) atoms to form PrO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and faces with two equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 17°. All Pr(1)-O(1) bond lengths are 2.38 Å. Nb(1) is bonded to six equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Pr(1)O6 octahedra and faces with two equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 17°. All Nb(1)-O(1) bond lengths are 2.03 Å. O(1) is bonded in a 3-coordinate geometry to one Ba(1), three equivalent Ba(2), one Pr(1), and one Nb(1) atom.