Dielectric loss anomaly in Ba(Fe 1/2Ta 1/2)O 3 ceramics

The dielectric loss relaxation characteristic of Ba(Fe 1/2Ta 1/2)O 3 ceramics, which has cubic perovskite structure, was studied. The frequency dependence of dielectric loss, dielectric loss tangent and electric modulus were analyzed in the frequency range from 20 Hz to 1 MHz by changing the tempera...

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Bibliographic Details
Published inMaterials letters Vol. 56; no. 3; pp. 334 - 338
Main Authors Jung, Woo-Hwan, Lee, Joon-Hyung, Sohn, Jeong-Ho, Nam, Hyo-Duk, Cho, Sang-Hee
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2002
Subjects
Complex impedance spectroscopy
Dielectric loss
Perovskite Ba(Fe 1/2Ta 1/2)O 3
Thermal motion
Dielectric loss
Perovskite Ba(Fe 1/2Ta 1/2)O 3
Complex impedance spectroscopy
Thermal motion
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Summary:The dielectric loss relaxation characteristic of Ba(Fe 1/2Ta 1/2)O 3 ceramics, which has cubic perovskite structure, was studied. The frequency dependence of dielectric loss, dielectric loss tangent and electric modulus were analyzed in the frequency range from 20 Hz to 1 MHz by changing the temperature up to 372 K. Complex impedance spectroscopy technique was also used to examine the dielectric characteristics. A Debye-like dielectric loss relaxation was observed around room temperature, which was not reported so far. Its activation energy was 0.15 eV and the relaxation time was 10 −7 s. The Debye-like dielectric loss relaxation was explained by the different thermal motion of B-site ions.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(02)00478-0