Kinetic analysis crystallization of alpha-Al2O3 by dynamic DTA technique

The phase transformation of seeded (5 mass% Fe2O3 as a Fe(NO3)(3) solution) boehmite derived alumina gel to alpha-Al2O3 was studied with DTA technique and compared with unseeded and alpha-Al2O3 seeded boehmite gels. Data for kinetic analysis of alpha-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 alpha-Al2O3 transformation for originally gamma-AlOOH/Fe(NO3)(3) gels goes like that of unseeded boehmite gels, only under lower temperatures (lower about 200degreesC).