Defect contributions to the anomalous permittivity in CaCu 3Ti 4O 12 ceramics

Seymen Aygün, Xiaoli Tan, David Cann, Jon Paul Maria

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Recent reports on CaCu 3Ti 4O 12 (CCT) have attributed the anomalously large permittivity to Maxwell-Wagner effects due to the presence of space charge [I. P. Raevski et al. J. Appl. Phys. 93, 4130 (2003)]. In this work, TEM analysis on polycrystalline samples revealed unique microstructural features including dislocation networks on the micrometer scale and twin-like structures on the 10 nm scale. In addition, the dielectric spectra exhibited two relaxation-like features at approximately 100 K and 400 K. The low temperature permittivity was relatively insensitive to processing conditions. However, the high temperature permittivity increased dramatically with increasing oxygen partial pressure during annealing. This suggests that while the presence of charge carriers plays a role in the dielectric response of CaCu 3Ti 4O 12, they are not solely responsible for the anomalously large room temperature permittivity.

Original languageEnglish (US)
Title of host publicationInterfaces in Electronic Materials - Proceedings of the International Symposium
Pages197-205
Number of pages9
StatePublished - Jul 20 2006
Event204th Electrochemical Society Fall Meeting - Orlando, FL, United States
Duration: Oct 12 2003Oct 16 2003

Publication series

NameProceedings - Electrochemical Society
VolumePV 2003-31

Other

Other204th Electrochemical Society Fall Meeting
CountryUnited States
CityOrlando, FL
Period10/12/0310/16/03

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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