NDLI: New combination of non-isothermal kinetics-revealing methods : Study of Se90Te10 powders with heterogeneous particle sizes and shapes

Content Provider	Springer Nature Link
Author	Hammam, Mohamed A. S. Abdel Rahim, M. A. Hafiz, M. M. Abu Sehly, A. A.
Copyright Year	2017
Abstract	This work introduces a new method of calculations depending on the essential assumptions of the kinetic methods, with the least amount of approximations to find the apparent kinetic parameters calculated for the crystallization of the Se$_{90}$Te$_{10}$ powders with heterogeneous particle sizes and shapes under non-isothermal conditions. The apparent kinetic parameters calculated by the new method are compared with that calculated blindly by applying Málek’s method, ignoring its applicability condition of invariant activation energy. The new method is based on the assumption that the kinetic function $$f\left( \alpha \right)$$ parameters are independent of the heating rate $$\beta$$ and time $$t$$ , and the fitting temperature function is assumed to be in the approximated form $$K\left( T \right) = K\left( {t,\beta } \right) = ct^{\text{r}} \beta^{\text{s}}$$ . The exponents $$r$$ and $$s$$ are calculated isoconversionally, while the constant $$c$$ and the kinetic function $$f\left( \alpha \right)$$ parameters are calculated by a curve fitting method using a generalized form of the Šesták and Berggren function, considering the steadily and logarithmic acceleration and deceleration of the curve. According to the data in this work, the fitting temperature function can be roughly approximated to the form $$K\left( T \right) \approx c/t$$ which work in with the physical dimensions of the rate constant. Moreover, the Arrhenian and the non-Arrhenian parameters, which describe the fitting temperature function $$K\left( T \right)$$ , are calculated isoconversionally. The deduced parameters work harmonically together to perfectly fit the experimental and the true data.
Starting Page	1391
Ending Page	1405
Page Count	15
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	128
Issue Number	3
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-01-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermal analysis Non-isothermal conditions Variant activation energy Chalcogenides Generalized Šesták–Berggren function New method 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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