Complex impedance analysis of NaLaTiO4 electroceramics

A layered perovskite type ceramic oxide, NaLaTiO^sub 4^, has been prepared by a standard high temperature solid-state reaction route. Material formation has been confirmed by x-ray diffraction (XRD) studies. Complex impedance analysis on this system has been carried out, to investigate its electrica...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2006-03, Vol.17 (3), p.157-164
Main Authors: PRADHAN, Dillip K, SAMANTARAY, B. K, CHOUDHARY, R. N. P, THAKUR, Awalendra K
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Materials
Microelectronics
Studies
Temperature
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Summary:A layered perovskite type ceramic oxide, NaLaTiO^sub 4^, has been prepared by a standard high temperature solid-state reaction route. Material formation has been confirmed by x-ray diffraction (XRD) studies. Complex impedance analysis on this system has been carried out, to investigate its electrical properties in details. The impedance analysis results have indicated the electrical conduction process to be governed by the contribution of both the grain (bulk) and grain boundaries above a temperature of 350 ^sup ^C with typical negative temperature coefficient of resistance (NTCR) type behaviour like that of a semiconductor. The d. c. conductivity of the material as evaluated from the impedance analysis has been observed to be of the order of 10^sup -9^ Scm^sup -1^ at room temperature and 10^sup -6^ Scm^sup -1^ at 500 ^sup ^C. The conductivity variation shows a cross over from Mott-type hopping behaviour at lower temperatures to a thermally activated Arrhenius behaviour at higher temperatures.[PUBLICATION ABSTRACT]
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-006-6756-0