Ca3Hg2 crystallizes in the tetragonal P4/mbm space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a square co-planar geometry to four equivalent Hg(1) atoms. In the second Ca site, Ca(2) is bonded to six equivalent Hg(1) atoms to form a mixture of distorted corner, edge, and face-sharing CaHg6 pentagonal pyramids. Hg(1) is bonded in a 8-coordinate geometry to two equivalent Ca(1) and six equivalent Ca(2) atoms.
Ca3Hg2 crystallizes in the tetragonal P4/mbm space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a square co-planar geometry to four equivalent Hg(1) atoms. All Ca(1)-Hg(1) bond lengths are 3.29 Å. In the second Ca site, Ca(2) is bonded to six equivalent Hg(1) atoms to form a mixture of distorted corner, edge, and face-sharing CaHg6 pentagonal pyramids. There are two shorter (3.22 Å) and four longer (3.28 Å) Ca(2)-Hg(1) bond lengths. Hg(1) is bonded in a 8-coordinate geometry to two equivalent Ca(1) and six equivalent Ca(2) atoms.