Mg3Ca is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. Ca(1) is bonded in a distorted body-centered cubic geometry to six equivalent Mg(1) and eight equivalent Mg(2) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 14-coordinate geometry to six equivalent Ca(1) and eight equivalent Mg(2) atoms. In the second Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Ca(1) and four equivalent Mg(1) atoms.
Mg3Ca is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. Ca(1) is bonded in a distorted body-centered cubic geometry to six equivalent Mg(1) and eight equivalent Mg(2) atoms. All Ca(1)-Mg(1) bond lengths are 3.72 Å. All Ca(1)-Mg(2) bond lengths are 3.22 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 14-coordinate geometry to six equivalent Ca(1) and eight equivalent Mg(2) atoms. All Mg(1)-Mg(2) bond lengths are 3.22 Å. In the second Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Ca(1) and four equivalent Mg(1) atoms.