Determination of kinetic characteristics of polycrystalline ferrites oxidation using TG analisis

Anatoly Petrovich Surzhikov, Tamara Frangulyan, Serge Ghyngazov, Olga Kazakovskaya, Elena Lysenko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Using non-isothermal thermogravimetry (TG), the oxidation kinetics of oxygen-deficient lithium-titanium ferrospinel, Li0.649 Fe 1.598 Ti0..5Zn0..2Mn0.051O 4-δ, manufactured by ceramic engineering is investigated. The oxidation annealing of powder samples is performed in air. According to the X-ray phase analysis, the processes giving rise to variations in oxygen content occur within single-phase spinel structure. The experimental kinetic results are processed using the Netzsch Thermokinetics software. The oxidation rate constants and the effective coefficients of atmospheric oxygen diffusion into the ferrites are determined. The effective activation energy E of oxygen diffusion is found to be 1.95 eV. It is demonstrated that an increase in the oxygen non-stoichiometry parameter δ as a result of recovery annealing of ferrite powders in vacuum at T=1070 K for 2 hours gives rise to a slight decrease in E down to 1.89 eV. The activation energy of oxygen grain-boundary diffusion is identified by the electroconduction method. The resulting value 1.93 eV is fairly consistent with that obtained by TG.

Original languageEnglish
Title of host publicationProceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012
DOIs
Publication statusPublished - 2012
Event2012 7th International Forum on Strategic Technology, IFOST 2012 - Tomsk, Russian Federation
Duration: 18 Sep 201221 Sep 2012

Other

Other2012 7th International Forum on Strategic Technology, IFOST 2012
CountryRussian Federation
CityTomsk
Period18.9.1221.9.12

Keywords

  • kinetics
  • oxidation of lithium-titanium ferrites
  • oxygen diffusion
  • TG

ASJC Scopus subject areas

  • Management of Technology and Innovation

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    Surzhikov, A. P., Frangulyan, T., Ghyngazov, S., Kazakovskaya, O., & Lysenko, E. (2012). Determination of kinetic characteristics of polycrystalline ferrites oxidation using TG analisis. In Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012 [6357797] https://doi.org/10.1109/IFOST.2012.6357797