Chiang Mai Journal of Science

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Self-diffusion coefficient ‘D’ of liquid metals has been evaluated under pseudopotential formalism and liquid state dynamics. A suitable expression of D (D=Kv_sβ_LT_m/r_s) of Swalin is used, during studies of melting behaviours of metals. We have reassessed various concepts of Ziman, Ascarelli – Harrisson – Paskin, Enderby – March – Tosi and Lindemann criteria. A new concept of isothermal compressibility βL
[β_L^-1 =( β_L^pl)^-1 + (β_L^st )^-1 ] of liquid metals is derived in terms of plasma ( β_L^Pl ) and band structural (β_L^st) contributions of compressibilities. Our methodology presents good results of self-diffusion coefficeient D of liquid alkali metals.

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