Naslov
Resolution of overlapping peaks and the determination of kinetic parameters for the crystallization of multicomponent system from DTA or DSC curves: II. Isothermal kinetics

Autori
Kurajica, Stanislav ; Bezjak, Aleksandar ; Tkalčec, Emilija

Izvornik
Thermochimica Acta (0040-6031) (2000), 360; 63-70

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Computer program; Crystallization kinetics; Differential thermal analysis; Mullite; Overlapping

Sažetak
A computer program has been created to separate overlapping exothermic DTA (DSC) effects, obtained under isothermal conditions, occuring due to simultaneous crystallization processes, and also to calculate the kinetic parameters of the processes represented by each peak. A graphical method for the estimation of the required parameters, i.e. initialization, and the refinement of the initial values by the least square method is presented. The procedure for determination of the kinetic parameters from DTA data is demonstrated on a model system and on a kinetic analysis of mullite formation from single phase gel. The two-step mullite crystallization model was proposed and the fitting was remarkably good throughout the whole temperature range.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA