Abstract
Using an ordinary Arrhenius equation kDl=k0e−EIRT, energy (E), enthalpy (ΔHa), entropy (ΔSa), and free energy (δGa) of activation and the preexponential factor (K0) were estimated for diffusion‐controlled crystal growth of calcium tungstate from solutions in lithium chloride and sodium tungstate melts. Although E was small and increased slightly with increased cooling rates (RT), there was no direct correlation. The ΔHa, ΔSa, and ΔGa were unaffected by the changes in RT and crystallization temperature (T0). The distance (d12) between a diffusing particle and its host crystal, necessary for a successful diffusion, was estimated. Such distances increased with T0 and RT for the system CaWO4‐Na2WO4 but, for the system CaWO4‐LiCl, they decreased with RT and increased with T0.
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