Detail publikace

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.

Originální název

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

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

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

Autoři

PTÁČEK, P.; OPRAVIL, T.; ŠOUKAL, F.

Vydáno

5. 11. 2016

Nakladatel

Elsevier

Místo

Oxford, Velká Británie

ISSN

0272-8842

Periodikum

Ceramics International

Ročník

42

Číslo

15

Stát

Spojené království Velké Británie a Severního Irska

Strany od

16969

Strany do

16980

Strany počet

12

URL

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

Plný text v Digitální knihovně

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"
}