An Analysis of Nucleation-Rate Type of Curves in Glass As Determined by Differential Thermal Analysis


The nucleation rate (I) versus temperature type of curves for a Na 2O·2CaO·3SiO 2 (NC 2S 3) glass doped with 0.1 wt% platinum, 0.5 wt% Ag 2O, and 2.0 wt% P 2O 5 were determined using a previously developed differential thermal analysis (DTA) technique. In this DTA technique, a constant amount of glass sample was nucleated at selected temperatures for a specific time, followed by a DTA scan at a fixed heating rate. The functional dependence of the maximum intensity of the exothermic DTA crystallization peak ((δT) p) or the inverse temperature at the DTA peak maximum (T -1 p) on the nucleation temperature (T n) was used to determine the nucleation rate versus temperature type of curves. Calculations for qualitatively assessing the dependence of (δT) p on T n were performed using I and crystal growth rate (U) curves for a hypothetical system. Values of (δT) p calculated for different degrees of overlap between the I and U curves were compared with those measured experimentally. The (δT) p vs T n curves depended strongly on the overlap of I and U, whereas the T -1 p vs T n curves were unaffected by the overlap.


Materials Science and Engineering

Keywords and Phrases

Calculations; Crystallization; Differential thermal analysis; Platinum; Silver compounds; Nucleation rate; Nucleation temperature, Glass

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Article - Journal

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