Abstract
An experimental study of the kinetics of clustering and precipitation in the system LiF:MgF 2 has been undertaken. The results showed that the pre-plateau region of the ageing curves is due to a homogeneous clustering reaction dominated by third-order kinetics with an activation energy of 0.85 ± 0.05 eV. The trimer binding energy was found to be 0.95 ± 0.05 eV. The post-plateau reaction has been shown to be a precipitation reaction in which a Suzuki phase is formed. These kinetic data have been analysed in terms of an Avrami equation and shown to be consistent with the idea of precipitate particles growing from a solid solution.
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