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Ca 3 Ru 3 Zn 13  was synthesized from the elements in a tantalum tube in a muffle furnace. The sample was annealed to 1123 K followed by slow cooling to enhance crystal growth. Ca 3 Ru 3 Zn 13  was characterized through a Guinier powder pattern. The structure was refined from single crystal X-ray diffractometer data: new type,  Pbcn ,  a  = 522.92(5),  b  = 1792.72(14),  c  = 2789.6(2) pm,  wR 2 = 0.0590, 3451  F  2  values, 177 variables. One can describe the Ca 3 Ru 3 Zn 13  structure by a stacking of closest packed layers of compositions Ca 6 Zn 10 , Ca 6 Zn 12  and Ru 6 Zn 15 . The calcium atoms have high coordination numbers: Ca1@Zn 13 Ru 3 Ca 2 , Ca2@Zn 15 Ru 4 Ca, Ca3@Zn 15 Ru 4 Ca and Ca4@Zn 15 Ru 4 Ca. The shortest interatomic distances occur between the ruthenium and zinc atoms (255–273 pm). The Ru1@Zn 8 , Ru2@Zn 10  and Ru3@Zn 8  polyhedra condense via common edges to the [Ru 3 Zn 13 ] substructure which hosts the calcium atoms. The zinc substructure consists of 15 crystallographically independent zinc sites with a broader range of Zn–Zn distances (255–307 pm).

Ca 3 Ru 3 Zn 13 – a zinc-rich intermetallic phase composed of closest-packed layers