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The Ca–Zn–Al system has been investigated in the region from 8 to 33 at% Ca. The results show that the following phases are solid solutions based on the corresponding known binary compounds: Ca(Zn 1– x  Al  x  ) 3  ( x  = 0 – 0.23, CaZn 3  type), Ca(Zn 1– x  Al  x  ) 4  ( x  = 0.47 – 1.00, BaAl 4  type), Ca 1– y  (Zn 1– x  Al  x  ) 5+2y  ( x  = 0 – 0.12 and  y  = 0 – 0.12, CaCu 5 -derived TbCu 7  type), Ca(Zn 1– x  Al  x  ) 11  ( x  = 0 – 0.018, BaCd 11  type), while the phase Ca 2 (Zn 1– x  Al  x  ) 17  ( x  = 0.05 – 0.17, Th 2 Zn 17  type) exists with a ternary composition only. In all pseudobinary systems the cell volume generally increases with increasing Al content, as expected for the higher atomic volume of Al compared with Zn. A substitution of Al for Zn is generally observed, but preferential occupations, namely different Al/Zn ratio values, occur for different crystallographic sites. This phenomenon gives rise to anomalous trends in the variations of the lattice parameters.

Structural features of intermetallic phases in the Ca–Zn–Al system