Dielectric, pyroelectric and ferroelectric properties of Bi4Ti2.98Nb0.01Ta0.01O12 ceramics

The electrical conductivity and electrical relaxation of ferroelectric Bi4Ti2.98Nb0.01Ta0.01O12 (BTNT) ceramics have been reported in the frequency range 0.1 Hz to 1 MHz and in the 300-550 C temperature range. The electrical data were analysed in the framework of the dielectric and electric modulus...

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Published inMaterials chemistry and physics Vol. 121; no. 1-2; pp. 32 - 36
Main Authors Hou, J, Vaish, R, Qu, Y, Krsmanovic, D, Varma, K B R, Kumar, R V
Format Journal Article
LanguageEnglish
Published 15.05.2010
Subjects
Activation energy
Ceramics
Coefficients
Conductivity
Direct current
Ferroelectric materials
Ferroelectricity
Resistivity
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Summary:The electrical conductivity and electrical relaxation of ferroelectric Bi4Ti2.98Nb0.01Ta0.01O12 (BTNT) ceramics have been reported in the frequency range 0.1 Hz to 1 MHz and in the 300-550 C temperature range. The electrical data were analysed in the framework of the dielectric and electric modulus formalisms. The bulk dc conductivity at various temperatures was extracted from the electrical relaxation data. The activation energy associated with the electrical relaxation determined from the electric modulus spectra was 0.93 plus or minus 0.03 eV, close to that of the activation energy for dc conductivity (1.03 plus or minus 0.02 eV). This suggests that the movement of oxygen ions is responsible for both ionic conduction and the relaxation process. The pyroelectric coefficient was 12 microC/m2.K at room temperature, which is higher than that of the reported value of pyroelectric coefficient for undoped Bi4Ti3O12 ceramics.
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ISSN:0254-0584
DOI:10.1016/j.matchemphys.2009.12.036