ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The nucleation rate (I) versus temperature type of curves for a Na2O2·CaO·3SiO2 (NC2S3) glass doped with 0.1 wt% platinum, 0.5 wt% Ag2O, and 2.0 wt% P2O5 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 ((deltaT)p) or the inverse temperature at the DTA peak maximum (Tp−1) on the nucleation temperature (Tn) was used to determine the nucleation rate versus temperature type of curves. Calculations for qualitatively assessing the dependence of (deltaT)p on Tn were performed using I and crystal growth rate (U) curves for a hypothetical system. Values of (deltaT)p calculated for different degrees of overlap between the I and U curves were compared with those measured experimentally. The (deltaT)p vs Tn curves depended strongly on the overlap of I and U, whereas the Tp−1 vs Tn curves were unaffected by the overlap.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.1997.tb03238.x
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