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Estimation of the Nucleation Rate by Differential Scanning Calorimetry
Author(s) -
Kelton Kenneth F.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb05597.x
Subject(s) - devitrification , nucleation , thermodynamics , isothermal process , differential scanning calorimetry , volume fraction , statistical physics , materials science , cluster (spacecraft) , mineralogy , chemistry , crystallization , physics , computer science , programming language
A realistic computer model is presented for calculating the time‐dependent volume fraction transformed during the devitrification of glasses, assuming the classical theory of nucleation and continuous growth. Time‐ and cluster‐dependent nucleation rates are calculated by modeling directly the evolving cluster distribution. Statistical overlap in the volume fraction transformed is taken into account using the standard Johnson–Mehl–Avrami formalism. Devitrification behavior under isothermal and nonisothermal conditions is described. The model is used to demonstrate that the recent suggestion by Ray and Day, 1 that nonisothermal DSC studies can be used to determine the temperature for the peak nucleation rate, is qualitatively correct for lithium disilicate, the glass investigated.