Homogeneity range and crystal structure of the Ca2Mg5Zn13 compound

► Solubility range and crystal structure of Ca2Mg5Zn13 were studied. ► The homogeneity range was determined using diffusion couples and key alloys. ► The crystal structure was found to have a Sm3Mg13Zn30 prototype. ► The atomic coordination spheres and site occupancy were discussed.