Study of concentration fluctuations in liquid Li-Na alloy

• Published in: Indian journal of pure & applied physics 2003-10, Vol.41 (10), p.810-813
• Main Authors: Lad, K N, Raval, K G, Pratap, A
• Format: Article
• Language: English
• ISSN: 0019-5596

The concentration fluctuations in the long-wavelength limit, Scc(0), in liquid Li-Na alloy have been studied using the Bhatia-March formula, re-derived for binary liquid alloys by Hoshino and Young from the first principle calculations. The effective inter-atomic pair potentials in the binary liquid alloy are obtained in the pseudopotential formulism. Since Li possesses simple 1 s electronic structure, the choice of the pseudopotential is critical for it. The effect of the choice of the input parameter, namely core radius, in the Ashcroft pseudopotential and different local field correction to the dielectric function, on the effective pair potential in Li has been studied. It has been found that, the Ashcroft potential with a suitable choice of the core radius still works. The concentration dependence of Scc(0) shows asymmetrical behaviour in qualitative agreement with molecular dynamics results of Mori et al., J Phys Soc Japan, 61 (1992) 1218. The asymmetrical behaviour indicates the phase separation tendency in the Li-Na alloy.