Abstract
The lattice spacings of twenty-two alloys of the h.c.p. ζ-phase of the silver-tin-cadmium ternary system have been measured by X-ray powder photography. It is shown that the axial ratio of the ζ-phase is constant at a constant electron concentration of 1.40, despite variation in the a and c lattice spacings. At constant electron/atom ratios of 1.45, 1.50 and 1.55, however, the axial ratios of the ζ-phase alloys of the same electron concentrations are not constant; this behaviour is contrary to that observed for ternary copper-base ζ-phases and for the ζ-phase of the gold-tin-cadmium system. These phenomena are interpreted in terms of the interactions between the Fermi surface and the faces of the first Brillouin zone for the h.c.p. structure, and the possible effects of the solute elements on the band gaps across the zone faces are discussed.
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