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Kinetic study of the solid state reaction between alpha-Fe2O3 and ZnO for zinc ferrite formation

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dc.contributor.author Halikia, Iliana en
dc.contributor.author Milona, Evangelia en
dc.date.accessioned 2014-03-01T01:09:57Z
dc.date.available 2014-03-01T01:09:57Z
dc.date.issued 1994 en
dc.identifier.issn 0008-4433 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/11255
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-0028421061&partnerID=40&md5=5386f5398f4fbdebcb7a5f86b33c2656 en
dc.subject.classification Metallurgy & Metallurgical Engineering en
dc.subject.other Approximation theory en
dc.subject.other Calculations en
dc.subject.other Calibration en
dc.subject.other Diffusion en
dc.subject.other Ferrites en
dc.subject.other Iron oxides en
dc.subject.other Low temperature operations en
dc.subject.other Mathematical models en
dc.subject.other Mixtures en
dc.subject.other Temperature en
dc.subject.other X ray analysis en
dc.subject.other Zinc oxide en
dc.subject.other Activation energy en
dc.subject.other Arrhenius expression en
dc.subject.other Molar ratio en
dc.subject.other Nucleation en
dc.subject.other Phase boundary reaction en
dc.subject.other Solid state reaction en
dc.subject.other Time en
dc.subject.other X ray diffraction en
dc.subject.other Zinc ferrite en
dc.subject.other Reaction kinetics en
dc.title Kinetic study of the solid state reaction between alpha-Fe2O3 and ZnO for zinc ferrite formation en
heal.type journalArticle en
heal.language English en
heal.publicationDate 1994 en
heal.abstract The solid state reaction between ferric oxide and zinc oxide to form zinc ferrite was studied considering the variables of temperature, time and molar ratio of the reactant oxides. The reaction mixtures were analysed by X-ray diffraction and the external standard method was applied to follow the reaction quantitatively. The intensity of the strongest reflections of alpha-Fe2O3 and ZnO were measured and calibration graphs, prepared for standard mixtures, were used to calculate the fraction reacted, alpha. Selection of the strongest oxide lines improved the sensitivity and lowered the detection limit of the quantitative analysis. The nucleation of zinc ferrite was retarded in reaction mixtures with an excess of ferric oxide. The presence of zinc oxide, in ratios higher than equimolar, accelerated the reaction. Reaction data were analysed using kinetic equations corresponding to models of (a) diffusion, (b) nucleation and (c) phase boundary reaction. After an initial period at low temperature, during which the interface reaction rate and diffusion through the layer product contributed comparably to the reaction rate, the reaction in equimolar mixtures was approximated by the diffusion equations. The Arrhenius expression was used to calculate the activation energy. en
heal.publisher Pergamon Press Inc, Tarrytown, NY, United States en
heal.journalName Canadian Metallurgical Quarterly en
dc.identifier.isi ISI:A1994NF55600002 en
dc.identifier.volume 33 en
dc.identifier.issue 2 en
dc.identifier.spage 99 en
dc.identifier.epage 109 en


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