The elastic moduli, the volume contribution and the Cauchy ratio for d and f shell metals

The elastic constants of nine transitions metals and four rare-earths and actinides are calculated using the ion-ion interactions defined by us recently. The volume contribution to elastic moduli is calculated by exploiting the density dependence of the screening function. The calculated volume contribution to bulk modulus is found to vary between 17.1% and 62.4% for a number of metals, which is quite significant and play an important role for describing quantitatively the violation of the Cauchy ratio for these metals. (author). 48 refs., 2 tabs