NDLI: Crystallization kinetics of Al$_{2}$O$_{3}$–Yb$_{2}$O$

Content Provider	Springer Nature Link
Author	Plško, Alfonz Liška, Marek Pagáčová, Jana
Copyright Year	2011
Abstract	Crystallization kinetics of Al$_{2}$O$_{3}$–Yb$_{2}$O$_{3}$ glass microspheres with two different compositions was studied by DTA. Heating rates ranging from 3 to 15 °C min$^{−1}$ were used for DTA measurement. The DTA curves obtained were transformed into the dependence of conversion, α, on temperature. The model f(α) = α$^{ n }$(1 − α)$^{ m }$, i.e., the model of Sestak and Berggren, was found suitable for the description of crystallization kinetics. The best fit of experimental data was obtained if the full set of measured conversion degrees was used for calculation of kinetic parameters. In this manner, the following results were obtained: A = 6.10 × 10$^{20 }$min$^{−1}$, E = 4.68 × 10$^{5}$ J mol$^{−1}$, n = 0.634, m = 1.037 for 30 wt% Al$_{2}$O$_{3}$–70 wt% Yb$_{2}$O$_{3}$ glass, and A = 6.98 × 10$^{25 }$min$^{−1}$, E = 5.97 × 10$^{5}$ J mol$^{−1}$, n = 0.562, m = 0.975 for 45 wt% Al$_{2}$O$_{3}$–55 wt% Yb$_{2}$O$_{3}$ glass.
Starting Page	505
Ending Page	509
Page Count	5
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	108
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-10-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aluminate glass Crystallization kinetics Regression analysis DTA Inorganic Chemistry Polymer Sciences Measurement Science and Instrumentation Analytical Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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