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Study of the dielectric properties of ACu3Ti4O12 (A = Eu2/3, Tb2/3, and Na1/2Eu1/2)

Published online by Cambridge University Press:  20 September 2019

M. Li Open the ORCID record for M. Li [Opens in a new window] ,
Y. Shen  and
C. X. Li
M. Li*
Affiliation:
Department of Applied Physics, Xi'an University of Technology, Xi'an 710054, China
Y. Shen
Affiliation:
Department of Applied Physics, Xi'an University of Technology, Xi'an 710054, China
C. X. Li
Affiliation:
Department of Applied Physics, Xi'an University of Technology, Xi'an 710054, China
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

We report the dielectric properties of ACu3Ti4O12 (A = Eu2/3, Tb2/3, and Na1/2Eu1/2) (ACTO) in the frequency range of 40 Hz–2.5 MHz and in the temperature range of 293–473 K. The experimental results show that substituting for Ca improves the loss tangent of CaCu3Ti4O12 (CCTO). Although the dielectric constants largely decrease, they remain at a high level of 103. To identify the observed dielectric performances of ACTO, scanning electron microscopy and complex impedance measurements were conducted. The conducting mechanism for the grain of ACTO was found to be ion jumping rather than electron hopping (for the grain of CCTO). The results show that the decreased dielectric constant may be related to the decreased grain size, the different carrier in the grain, the different grain boundary properties, or a combination of these factors. All these factors are associated with the deficiency of oxygen vacancies in the samples of ACTO. The decreased loss tangent may be due to the increase in the grain boundary resistance.

Keywords

CaCu3Ti4O12microstructuredielectric propertiesoxygen vacancy
Type
Technical Article
Information
Powder Diffraction , Volume 34 , Issue 4 , December 2019 , pp. 345 - 351
Copyright
Copyright © International Centre for Diffraction Data 2019 

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