NDLI: Non-isothermal crystallization kinetics of a Si–Ca–P

Content Provider	Springer Nature Link
Author	Davim, E. J. C. Ses, A. M. R. Fernandes, M. H. V.
Copyright Year	2014
Abstract	In this work, the crystallization process of a SiO$_{2}$–3CaO·P$_{2}$O$_{5}$–MgO glass was studied by non-isothermal measurements using differential thermal analysis carried out at various heating rates. X-ray diffraction at room and high temperature was used to identify and follow the evolution of crystalline phases with temperature. The activation energy associated with glass transition, (E $_{g}$), the activation energy for the crystallization of the primary crystalline phase (E $_{c}$), and the Avrami exponent (n) were determined under non-isothermal conditions using different equations, namely from Kissinger, Matusita & Sakka, and Osawa. A complex crystallization process was observed with associated activation energies reflecting the change of behavior during in situ crystal precipitation. It was found that the crystallization process was affected by the fraction of crystallization, (x), giving rise to decreasing activation energy values, E $_{c}$(x), with the increase of x. Values ranging from about 580 kJ mol$^{−1}$ for the lower crystallized volume fraction to about 480 kJ mol$^{−1}$ for volume fractions higher than 80 % were found. The Avrami exponents, calculated for the crystallization process at a constant heating rate of 10 °C min$^{−1}$, increased with the crystallized fraction, from 1.6 to 2, indicating that the number of nucleant sites is temperature dependent and that crystals grow as near needle-like structures.
Starting Page	643
Ending Page	651
Page Count	9
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	117
Issue Number	2
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-04-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crystallization Activation energy Avrami exponent Glass transition Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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