SrMgF4 crystallizes in the orthorhombic Cmc2_1 space group. Sr(1) is bonded in a 9-coordinate geometry to one F(4), two equivalent F(2), three equivalent F(1), and three equivalent F(3) atoms. Mg(1) is bonded to one F(1), one F(3), two equivalent F(2), and two equivalent F(4) atoms to form corner-sharing MgF6 octahedra. The corner-sharing octahedral tilt angles range from 6-41°. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to three equivalent Sr(1) and one Mg(1) atom. In the second F site, F(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1) and two equivalent Mg(1) atoms. In the third F site, F(3) is bonded to three equivalent Sr(1) and one Mg(1) atom to form distorted corner-sharing FSr3Mg trigonal pyramids. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent Mg(1) atoms.
SrMgF4 crystallizes in the orthorhombic Cmc2_1 space group. Sr(1) is bonded in a 9-coordinate geometry to one F(4), two equivalent F(2), three equivalent F(1), and three equivalent F(3) atoms. The Sr(1)-F(4) bond length is 2.68 Å. Both Sr(1)-F(2) bond lengths are 2.77 Å. There are two shorter (2.50 Å) and one longer (2.96 Å) Sr(1)-F(1) bond length. There is one shorter (2.48 Å) and two longer (2.55 Å) Sr(1)-F(3) bond lengths. Mg(1) is bonded to one F(1), one F(3), two equivalent F(2), and two equivalent F(4) atoms to form corner-sharing MgF6 octahedra. The corner-sharing octahedral tilt angles range from 6-41°. The Mg(1)-F(1) bond length is 1.98 Å. The Mg(1)-F(3) bond length is 2.04 Å. There is one shorter (1.97 Å) and one longer (2.04 Å) Mg(1)-F(2) bond length. Both Mg(1)-F(4) bond lengths are 2.00 Å. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to three equivalent Sr(1) and one Mg(1) atom. In the second F site, F(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1) and two equivalent Mg(1) atoms. In the third F site, F(3) is bonded to three equivalent Sr(1) and one Mg(1) atom to form distorted corner-sharing FSr3Mg trigonal pyramids. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent Mg(1) atoms.