Dielectric and ac impedance studies of nanostructured CaCu3Ti3.90Ce0.10O12 electro-ceramic synthesized by citrate-gel route

Effect of doping at Ti 4+ site by Ce 3+ has been examined in CaCu 3 Ti 3.90 Ce 0.10 O 12 synthesized by citrate-gel route. DTA/TG analysis of dry powder gives pre-information about formation of final product around 850 °C. X ray diffraction analysis confirmed the formation of CaCu 3 Ti 3.90 Ce 0.10...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2013-04, Vol.66 (1), p.50-58
Main Authors: Mandal, K. D., Singh, Laxman, Sharma, Sunita, Rai, U. S., Singh, M. M.
Format: Article
Language:English
Subjects:
Bulk modulus
Ceramics
Cerium
Chemistry
Chemistry and Materials Science
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Composites
Doping
Electrodes
Exact sciences and technology
General and physical chemistry
Glass
Grain boundaries
Grain size
Impedance
Inorganic Chemistry
Materials Science
Nanostructure
Nanotechnology
Natural Materials
Optical and Electronic Materials
Original Paper
Relaxation time
Scanning electron microscopy
Sintering (powder metallurgy)
Synthesis
Time constant
X-ray diffraction
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Summary:Effect of doping at Ti 4+ site by Ce 3+ has been examined in CaCu 3 Ti 3.90 Ce 0.10 O 12 synthesized by citrate-gel route. DTA/TG analysis of dry powder gives pre-information about formation of final product around 850 °C. X ray diffraction analysis confirmed the formation of CaCu 3 Ti 3.90 Ce 0.10 O 12 phase of the ceramic sintered at 950 °C for 12 h. Microstructure has been studied using scanning electron microscopy and confirmed the average grain size found in nano range 200–400 nm in system CaCu 3 Ti 3.90 Ce 0.10 O 12 .The nature of relaxation behavior of ceramic was also rationalized by using the impedance and modulus spectroscopy. The bulk conductivity indicates an Arrhenius-type thermally activated process. The ac conductivity spectrum obeyed the Jonscher power law. The complex impedance diagrams of the ceramic exhibited a significant contribution from the grains, grain boundaries and electrode. The activation energies calculated from the grain-boundary relaxation time constant was found to be 0.49 eV which confirmed the Maxwell–Wagner type of relaxation present in the ceramic.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-013-2965-1