Ba2MgPrSbO6 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. In the second Ba site, Ba(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted BaO6 octahedra that share corners with three equivalent Pr(1)O6 octahedra and  a faceface with one Pr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 62-63°. Mg(1) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. Pr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form PrO6 octahedra that share corners with three equivalent Ba(2)O6 octahedra and  a faceface with one Ba(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 62-63°. Sb(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Pr(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Pr(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Pr(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded to one Ba(1), one Ba(2), one Mg(1), and one Pr(1) atom to form a mixture of distorted corner and edge-sharing OBa2PrMg tetrahedra. In the fifth O site, O(5) is bonded to one Ba(1), one Ba(2), one Mg(1), and one Pr(1) atom to form a mixture of distorted corner and edge-sharing OBa2PrMg tetrahedra. In the sixth O site, O(6) is bonded to one Ba(1), one Ba(2), one Mg(1), and one Pr(1) atom to form a mixture of distorted corner and edge-sharing OBa2PrMg tetrahedra.
Ba2MgPrSbO6 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Ba(1)-O(1) bond length is 3.02 Å. The Ba(1)-O(2) bond length is 3.03 Å. The Ba(1)-O(3) bond length is 3.03 Å. The Ba(1)-O(4) bond length is 2.63 Å. The Ba(1)-O(5) bond length is 2.63 Å. The Ba(1)-O(6) bond length is 2.63 Å. In the second Ba site, Ba(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted BaO6 octahedra that share corners with three equivalent Pr(1)O6 octahedra and  a faceface with one Pr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 62-63°. The Ba(2)-O(1) bond length is 2.91 Å. The Ba(2)-O(2) bond length is 2.90 Å. The Ba(2)-O(3) bond length is 2.90 Å. The Ba(2)-O(4) bond length is 2.73 Å. The Ba(2)-O(5) bond length is 2.73 Å. The Ba(2)-O(6) bond length is 2.73 Å. Mg(1) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. The Mg(1)-O(4) bond length is 1.95 Å. The Mg(1)-O(5) bond length is 1.95 Å. The Mg(1)-O(6) bond length is 1.95 Å. Pr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form PrO6 octahedra that share corners with three equivalent Ba(2)O6 octahedra and  a faceface with one Ba(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 62-63°. The Pr(1)-O(1) bond length is 2.49 Å. The Pr(1)-O(2) bond length is 2.49 Å. The Pr(1)-O(3) bond length is 2.49 Å. The Pr(1)-O(4) bond length is 2.37 Å. The Pr(1)-O(5) bond length is 2.37 Å. The Pr(1)-O(6) bond length is 2.37 Å. Sb(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. The Sb(1)-O(1) bond length is 1.98 Å. The Sb(1)-O(2) bond length is 1.98 Å. The Sb(1)-O(3) bond length is 1.98 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Pr(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Pr(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Pr(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded to one Ba(1), one Ba(2), one Mg(1), and one Pr(1) atom to form a mixture of distorted corner and edge-sharing OBa2PrMg tetrahedra. In the fifth O site, O(5) is bonded to one Ba(1), one Ba(2), one Mg(1), and one Pr(1) atom to form a mixture of distorted corner and edge-sharing OBa2PrMg tetrahedra. In the sixth O site, O(6) is bonded to one Ba(1), one Ba(2), one Mg(1), and one Pr(1) atom to form a mixture of distorted corner and edge-sharing OBa2PrMg tetrahedra.