Ba2MgPrNbO6 is Krennerite-derived structured and crystallizes in the trigonal R3 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one Mg(1), three equivalent O(1), and six equivalent O(2) atoms. Mg(1) is bonded in a 3-coordinate geometry to one Ba(2) and three equivalent O(1) atoms. Pr(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted PrO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. Nb(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted NbO6 octahedra that share corners with six equivalent Pr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ba(2), two equivalent Ba(1), one Mg(1), one Pr(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(2), one Pr(1), and one Nb(1) atom.
Ba2MgPrNbO6 is Krennerite-derived structured and crystallizes in the trigonal R3 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. All Ba(1)-O(2) bond lengths are 2.84 Å. There are three shorter (2.85 Å) and three longer (3.19 Å) Ba(1)-O(1) bond lengths. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one Mg(1), three equivalent O(1), and six equivalent O(2) atoms. The Ba(2)-Mg(1) bond length is 3.19 Å. All Ba(2)-O(1) bond lengths are 2.60 Å. There are three shorter (3.01 Å) and three longer (3.16 Å) Ba(2)-O(2) bond lengths. Mg(1) is bonded in a 3-coordinate geometry to one Ba(2) and three equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.00 Å. Pr(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted PrO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. All Pr(1)-O(1) bond lengths are 2.70 Å. All Pr(1)-O(2) bond lengths are 2.47 Å. Nb(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted NbO6 octahedra that share corners with six equivalent Pr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. All Nb(1)-O(1) bond lengths are 2.24 Å. All Nb(1)-O(2) bond lengths are 1.95 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ba(2), two equivalent Ba(1), one Mg(1), one Pr(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(2), one Pr(1), and one Nb(1) atom.