Abstract
Electrical resistivity, ρ, for Na-based liquid alkali binary alloys namely NaxK1−x, NaxRb1−x, NaxCs1−x and NaxLi1−x are calculated using the extended Ziman's formula developed by Faber and Ziman. Form factor, Vij(q), and partial structure factor, Sij(q), are the main ingredients of this calculation. For Vij(q), we have chosen Bretonnet-Silbert (BS) pseudo-potential with Ichimaru-Utsumi (IU), and Vashishta-Singwi (VS) local field correction functions. For Sij(q), we have chosen linearized Weeks-Chandler-Andersen (LWCA) thermodynamic perturbation theory. From the comparison of the calculated results of ρ with available experimental data and other theoretical values, a good qualitative consistency is found except for liquid NaxLi1−x alloys. We observe that VS local field correction function along with LWCA theory provides much better results than those obtained with IU local field correction near melting point at the liquid state. Calculated results at temperatures far from the melting curve are deviated much from experimental data. Explanation behind this discrepancy requires a further study with more sophisticated theory.
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