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Kinetic Analysis Crystallization of α-Al2O3 by Dynamic DTA Technique

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Abstract

The phase transformation of seeded (5 mass% Fe2O3 as a Fe(NO3)3 solution) boehmite derived alumina gel to α-Al2O3 was studied with DTA technique and compared with unseeded and α-Al2O3 seeded boehmite gels. Data for kinetic analysis of α-Al2O3 crystallization were obtained from quantitative DTA curves. The kinetic parameters were analysed by traditional Kissinger analysis and Friedman and Ozawa-Flynn-Wall methods using the Netzsch Thermokinetics program. Results of the comparison of values of activation energies for all three gels and methods are the process of α-Al2O3 transformation for originally γ-AlOOH/Fe(NO3)3 gels goes like that of unseeded boehmite gels,only under lower temperatures (lower about 200°C).

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36, Bratislava, Slovak Republic

    L'. Bača

  2. Fachhochschule Münster, Fachbereich Chemieingenieurwesen, Supraleiter-Keramik-Kristalle and SIMa, Stegerwaldstrasse 39, 485 65, Steinfurt, Germany

    J. Plewa

  3. Faculty of Chemical Technology, Department of Ceramics, Glass and Cement, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovak Republic

    L. Pach

  4. Netzsch-Gerätebau GmbH, Wittelsbacherstrasse 42, 951 00, Selb, Germany

    J. Opfermann

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  1. L'. Bača
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  2. J. Plewa
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  3. L. Pach
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  4. J. Opfermann
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Bača, L., Plewa, J., Pach, L. et al. Kinetic Analysis Crystallization of α-Al2O3 by Dynamic DTA Technique. Journal of Thermal Analysis and Calorimetry 66, 803–813 (2001). https://doi.org/10.1023/A:1013148223203

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