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

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dc.contributor.authorPtáček, Petrcs
dc.contributor.authorOpravil, Tomášcs
dc.contributor.authorŠoukal, Františekcs
dc.coverage.issue15cs
dc.coverage.volume42cs
dc.date.accessioned2020-08-04T10:59:22Z
dc.date.available2020-08-04T10:59:22Z
dc.date.issued2016-11-05cs
dc.description.abstractThe 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 mol1, 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.en
dc.formattextcs
dc.format.extent16969-16980cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationCeramics International. 2016, vol. 42, issue 15, p. 16969-16980.en
dc.identifier.doi10.1016/j.ceramint.2016.07.203cs
dc.identifier.issn0272-8842cs
dc.identifier.other131610cs
dc.identifier.urihttp://hdl.handle.net/11012/70007
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofCeramics Internationalcs
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S0272884216312792cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/0272-8842/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectActivated complexen
dc.subjectCeramicsen
dc.subjectKineticsen
dc.subjectSr-celsianen
dc.subjectStrontian feldsparen
dc.subjectThermodynamicsen
dc.titleIntroduction of novel kinetic approach to calculation of activation energy and its application to the sinter-crystallization of strontian feldsparen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-131610en
sync.item.dbtypeVAVen
sync.item.insts2020.08.04 12:59:21en
sync.item.modts2020.08.04 12:24:52en
thesis.grantorVysoké učení technické v Brně. Fakulta chemická. CMV - laboratoř anorganických materiálůcs
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