Values for the Debye temperatures and bulk moduli for these phases appear to be determined primarily by the aluminum sublattice. This obser¬vation is consistent with the atomic contacts which are constrained to occur because of the atomic radius ratios within the geometry of the crys¬tal structure. The phase LaAl2 appears to be atypical.nExtensive work in the literature shows two separate ranges of electron-to-atom ratios for which the cubic Laves phases are stable. The present elasticity data when combined with previously available data show that the elastic anisotropy ratios, Poisson's ratios, and electronic bulk moduli have distinctively different values within the two groups of electron-to-atomic ratios.
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