BaPr2O4 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(2), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of corner and edge-sharing PrO6 octahedra. The corner-sharing octahedral tilt angles range from 51-64°. In the second Pr site, Pr(2) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing PrO6 octahedra. The corner-sharing octahedral tilt angles range from 51-64°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and three equivalent Pr(1) atoms to form a mixture of distorted corner and edge-sharing OBa2Pr3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ba(1), one Pr(1), and two equivalent Pr(2) atoms to form a mixture of distorted corner and edge-sharing OBa2Pr3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Ba(1) and three equivalent Pr(2) atoms to form a mixture of corner and edge-sharing OBa2Pr3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Pr(2), and two equivalent Pr(1) atoms.
BaPr2O4 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Ba(1)-O(1) bond lengths are 2.80 Å. There is one shorter (2.95 Å) and one longer (3.04 Å) Ba(1)-O(2) bond length. Both Ba(1)-O(3) bond lengths are 2.80 Å. Both Ba(1)-O(4) bond lengths are 2.93 Å. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(2), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of corner and edge-sharing PrO6 octahedra. The corner-sharing octahedral tilt angles range from 51-64°. The Pr(1)-O(2) bond length is 2.39 Å. Both Pr(1)-O(4) bond lengths are 2.43 Å. There is one shorter (2.38 Å) and two longer (2.48 Å) Pr(1)-O(1) bond lengths. In the second Pr site, Pr(2) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing PrO6 octahedra. The corner-sharing octahedral tilt angles range from 51-64°. The Pr(2)-O(4) bond length is 2.39 Å. Both Pr(2)-O(2) bond lengths are 2.35 Å. There is one shorter (2.45 Å) and two longer (2.52 Å) Pr(2)-O(3) bond lengths. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and three equivalent Pr(1) atoms to form a mixture of distorted corner and edge-sharing OBa2Pr3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ba(1), one Pr(1), and two equivalent Pr(2) atoms to form a mixture of distorted corner and edge-sharing OBa2Pr3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Ba(1) and three equivalent Pr(2) atoms to form a mixture of corner and edge-sharing OBa2Pr3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Pr(2), and two equivalent Pr(1) atoms.