Publication detail

Introduction of novel kinetic approach to calculation of activation energy and its application to the sinter-crystallization of strontian feldspar

PTÁČEK, P. OPRAVIL, T. ŠOUKAL, F.

Original Title

Introduction of novel kinetic approach to calculation of activation energy and its application to the sinter-crystallization of strontian feldspar

Type

journal article in Web of Science

Language

English

Original Abstract

The kinetics, the mechanism and the thermodynamics of activated state of formation of primary strontian feldspar via sinter-crystallization of non-equilibrium melt during the thermal treatment of ceramic body was investigated in this work via differential thermal analysis using isoconversional Kissinger kinetic equation. The process of formation of non-equilibrium melt and subsequent crystallization of primary strontian feldspar requires the activation energy of 631±3 and 664±2 kJ mol−1, respectively. The investigation of mechanism of formation of primary strontian feldspar reveals that the process is driven by the surface nucleation and diffusion controlled growth of the new phase. The nucleation rate decreases with the time of process and non-equilibrium melt can be formed only in metastable equilibrium with activated state of strontian feldspar. Deep consideration of kinetic data leads to the deduction of new kinetic approach that enables single calculation of activation energy and frequency factor of heterogeneous processes as well as the dependence of thermodynamic parameters of activated state on temperature. Further consideration of kinetic data reveals that the activation energy is directly proportional to the function of csch (z)+1. For z=e, this term enables to derive the value for the parameter B(x) in empirical equation for Arrhenius temperature integral p(x) proposed by Doyle to be 1.0642.

Keywords

Activated complex; Ceramics; Kinetics; Sr-celsian; Strontian feldspar; Thermodynamics

Authors

PTÁČEK, P.; OPRAVIL, T.; ŠOUKAL, F.

Released

5. 11. 2016

Publisher

Elsevier

Location

Oxford, Velká Británie

ISBN

0272-8842

Periodical

Ceramics International

Year of study

42

Number

15

State

United Kingdom of Great Britain and Northern Ireland

Pages from

16969

Pages to

16980

Pages count

12

URL

http://www.sciencedirect.com/science/article/pii/S0272884216312792

Full text in the Digital Library

http://hdl.handle.net/11012/70007

BibTex

@article{BUT131610,
  author="Petr {Ptáček} and Tomáš {Opravil} and František {Šoukal}",
  title="Introduction of novel kinetic approach to calculation of activation energy and its application to the sinter-crystallization of strontian feldspar",
  journal="Ceramics International",
  year="2016",
  volume="42",
  number="15",
  pages="16969--16980",
  doi="10.1016/j.ceramint.2016.07.203",
  issn="0272-8842",
  url="http://www.sciencedirect.com/science/article/pii/S0272884216312792"
}