BaMgMo(PO4)2 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 8-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(3), and three equivalent O(2) atoms. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to one O(4) and two equivalent O(1) atoms. Mo(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form MoO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(4), one O(6), and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 45°. In the second P site, P(2) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-44°. 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 Mg(1), one Mo(1), and one P(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to three equivalent Ba(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Mo(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mo(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1) and one P(1) atom.
BaMgMo(PO4)2 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 8-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(3), and three equivalent O(2) atoms. The Ba(1)-O(6) bond length is 2.76 Å. Both Ba(1)-O(1) bond lengths are 3.06 Å. Both Ba(1)-O(3) bond lengths are 2.81 Å. There is one shorter (3.16 Å) and two longer (3.20 Å) Ba(1)-O(2) bond lengths. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to one O(4) and two equivalent O(1) atoms. The Mg(1)-O(4) bond length is 2.03 Å. Both Mg(1)-O(1) bond lengths are 2.10 Å. Mo(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form MoO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The Mo(1)-O(4) bond length is 2.17 Å. The Mo(1)-O(5) bond length is 2.15 Å. Both Mo(1)-O(1) bond lengths are 2.20 Å. Both Mo(1)-O(3) bond lengths are 2.14 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(4), one O(6), and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 45°. The P(1)-O(4) bond length is 1.59 Å. The P(1)-O(6) bond length is 1.52 Å. Both P(1)-O(3) bond lengths are 1.56 Å. In the second P site, P(2) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-44°. The P(2)-O(2) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.53 Å. Both P(2)-O(1) bond lengths are 1.60 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 Mg(1), one Mo(1), and one P(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to three equivalent Ba(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Mo(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mo(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1) and one P(1) atom.