BaMgTiF7 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded in a 12-coordinate geometry to one F(1), one F(2), two equivalent F(3), two equivalent F(4), two equivalent F(5), two equivalent F(6), and two equivalent F(7) atoms. Mg(1) is bonded to one F(1), one F(2), one F(3), one F(5), one F(6), and one F(7) atom to form MgF6 octahedra that share corners with three equivalent Ti(1)F6 octahedra and  an edgeedge with one Ti(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. Ti(1) is bonded to one F(1), one F(2), one F(3), one F(4), one F(5), and one F(6) atom to form TiF6 octahedra that share corners with three equivalent Mg(1)F6 octahedra and  an edgeedge with one Mg(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Mg(1), and one Ti(1) atom. In the second F site, F(2) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Mg(1), and one Ti(1) atom. In the third F site, F(3) is bonded in a distorted water-like geometry to two equivalent Ba(1), one Mg(1), and one Ti(1) atom. In the fourth F site, F(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one Ti(1) atom. In the fifth F site, F(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one Mg(1), and one Ti(1) atom. In the sixth F site, F(6) is bonded in a distorted water-like geometry to two equivalent Ba(1), one Mg(1), and one Ti(1) atom. In the seventh F site, F(7) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Mg(1) atom.
BaMgTiF7 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded in a 12-coordinate geometry to one F(1), one F(2), two equivalent F(3), two equivalent F(4), two equivalent F(5), two equivalent F(6), and two equivalent F(7) atoms. The Ba(1)-F(1) bond length is 3.08 Å. The Ba(1)-F(2) bond length is 3.00 Å. There is one shorter (2.89 Å) and one longer (2.96 Å) Ba(1)-F(3) bond length. There is one shorter (2.78 Å) and one longer (2.80 Å) Ba(1)-F(4) bond length. There is one shorter (3.00 Å) and one longer (3.27 Å) Ba(1)-F(5) bond length. Both Ba(1)-F(6) bond lengths are 3.05 Å. There is one shorter (2.64 Å) and one longer (2.66 Å) Ba(1)-F(7) bond length. Mg(1) is bonded to one F(1), one F(2), one F(3), one F(5), one F(6), and one F(7) atom to form MgF6 octahedra that share corners with three equivalent Ti(1)F6 octahedra and  an edgeedge with one Ti(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. The Mg(1)-F(1) bond length is 1.97 Å. The Mg(1)-F(2) bond length is 2.01 Å. The Mg(1)-F(3) bond length is 2.11 Å. The Mg(1)-F(5) bond length is 2.06 Å. The Mg(1)-F(6) bond length is 2.06 Å. The Mg(1)-F(7) bond length is 1.93 Å. Ti(1) is bonded to one F(1), one F(2), one F(3), one F(4), one F(5), and one F(6) atom to form TiF6 octahedra that share corners with three equivalent Mg(1)F6 octahedra and  an edgeedge with one Mg(1)F6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. The Ti(1)-F(1) bond length is 2.02 Å. The Ti(1)-F(2) bond length is 2.01 Å. The Ti(1)-F(3) bond length is 2.05 Å. The Ti(1)-F(4) bond length is 1.90 Å. The Ti(1)-F(5) bond length is 1.98 Å. The Ti(1)-F(6) bond length is 2.05 Å. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Mg(1), and one Ti(1) atom. In the second F site, F(2) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Mg(1), and one Ti(1) atom. In the third F site, F(3) is bonded in a distorted water-like geometry to two equivalent Ba(1), one Mg(1), and one Ti(1) atom. In the fourth F site, F(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one Ti(1) atom. In the fifth F site, F(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one Mg(1), and one Ti(1) atom. In the sixth F site, F(6) is bonded in a distorted water-like geometry to two equivalent Ba(1), one Mg(1), and one Ti(1) atom. In the seventh F site, F(7) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Mg(1) atom.