The tetramethylsilane (TMS) self-diffusion coefficients in the binary solvent carbon tetrachloride (CTC) – acetone-d6 (A-d6) have been obtained by the pulsed gradient spin-echo nuclear magnetic resonance (PGSE NMR) method at 278, 298, and 318 K. The TMS self-diffusion coefficients increase as the A-d6 concentration and temperature become higher. The temperature dependences of the TMS self-diffusion coefficients at various concentrations of the binary solvent have been analysed based on the random discrete displacements model of self-diffusion presented in this paper. Within the framework of the proposed model, it is shown that the Arrhenius type of the temperature dependence of the self-diffusion coefficient (which is observed for TMS in this work) is a special case when the diffusion activation energy ED > kBT. In the opposite case, the temperature dependence of the self-diffusion coefficient tends to the form of the equation obtained for an ideal gas.
