Ca5Ga3 crystallizes in the tetragonal I4/mcm 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 Ga(2) atoms. In the second Ca site, Ca(2) is bonded to two equivalent Ga(1) and three equivalent Ga(2) atoms to form a mixture of distorted face, corner, and edge-sharing CaGa5 trigonal bipyramids. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to eight equivalent Ca(2) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Ca(1), six equivalent Ca(2), and one Ga(2) atom.
Ca5Ga3 crystallizes in the tetragonal I4/mcm 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 Ga(2) atoms. All Ca(1)-Ga(2) bond lengths are 3.22 Å. In the second Ca site, Ca(2) is bonded to two equivalent Ga(1) and three equivalent Ga(2) atoms to form a mixture of distorted face, corner, and edge-sharing CaGa5 trigonal bipyramids. Both Ca(2)-Ga(1) bond lengths are 3.32 Å. There are two shorter (3.18 Å) and one longer (3.20 Å) Ca(2)-Ga(2) bond length. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to eight equivalent Ca(2) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Ca(1), six equivalent Ca(2), and one Ga(2) atom. The Ga(2)-Ga(2) bond length is 2.44 Å.