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The ITC technique versatility has been exploited to analyze : 1) the kinetics of the nucleation and growth of segregated phase occlusions at the expense ofimpurity-vacancy (I. V.) dipoles in KCl : Pb in the annealing température range 420-500 K ; 2) the related Maxwell-Wagner-like relaxation which originates the huge ITC-B band ; 3) the structure of the occlusions, which is tentatively identified as the Suzuki phase ; 4) the shape of the occlusions which turned out to be rod like. 5) the huge ITC band which appears in the high temperature (T > 273 K) side of the ITC plot upon annealing LiF : Be in the température range 100 ⩽ Ta ⩽ 700 °C and which can berelated to impurity clouds surrounding dislocations

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