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 language | English |
|---|---|
| Title of host publication | Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012 |
| DOIs | |
| Publication status | Published - 2012 |
| Event | 2012 7th International Forum on Strategic Technology, IFOST 2012 - Tomsk, Russian Federation Duration: 18 Sep 2012 → 21 Sep 2012 |
Other
| Other | 2012 7th International Forum on Strategic Technology, IFOST 2012 |
|---|---|
| Country | Russian Federation |
| City | Tomsk |
| Period | 18.9.12 → 21.9.12 |
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Keywords
- kinetics
- oxidation of lithium-titanium ferrites
- oxygen diffusion
- TG
ASJC Scopus subject areas
- Management of Technology and Innovation
Cite this
Determination of kinetic characteristics of polycrystalline ferrites oxidation using TG analisis. / Surzhikov, Anatoly Petrovich; Frangulyan, Tamara; Ghyngazov, Serge; Kazakovskaya, Olga; Lysenko, Elena.
Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012. 2012. 6357797.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Determination of kinetic characteristics of polycrystalline ferrites oxidation using TG analisis
AU - Surzhikov, Anatoly Petrovich
AU - Frangulyan, Tamara
AU - Ghyngazov, Serge
AU - Kazakovskaya, Olga
AU - Lysenko, Elena
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - kinetics
KW - oxidation of lithium-titanium ferrites
KW - oxygen diffusion
KW - TG
UR - http://www.scopus.com/inward/record.url?scp=84871826302&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871826302&partnerID=8YFLogxK
U2 - 10.1109/IFOST.2012.6357797
DO - 10.1109/IFOST.2012.6357797
M3 - Conference contribution
SN - 9781467317702
BT - Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012
ER -