Non-isothermal kinetic equations applied to crystallization of glasses

Three of the most important equations for evaluating the activation energy of a chemical reaction are discussed in the present paper: a modification of the Kissinger equation, a graphic method and a derivative method. They are based on thermal analysis measurements under non-isothermal conditions. T...

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Bibliographic Details
Published in:Thermochimica acta 1993-11, Vol.227, p.125-133
Main Authors: Barbieri, L., Leonelli, C., Manfredini, T., Romagnoli, M., Pellacani, G.C., Siligardi, C.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Glasses
Structure, analysis, properties
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Summary:Three of the most important equations for evaluating the activation energy of a chemical reaction are discussed in the present paper: a modification of the Kissinger equation, a graphic method and a derivative method. They are based on thermal analysis measurements under non-isothermal conditions. These mathematical approaches were applied to the study of the crystallization of quaternary glassy systems RO-MgO-Al 2O 3-SiO 2 (where R is Ca, Sr, Ba, Zn), which separate from two to four crystalline phases. The nucleation mechanism was also determined by equations applied to DTA curves. Although the activation energy values obtained are similar to those given in the literature, some significant differences were present that depend on the method used and the nature of the crucibles.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(93)80256-A