Abstract
The effects of Cu-deficient on the microstructures, dielectric properties, and voltage–current nonlinearity of various Cu-deficient CaCu3Ti4O12 (CCTO) ceramics prepared by solid-state reactions were investigated. Owing to the Cu-deficient, the CuO secondary phase disappeared and the TiO2 and CaCO3 phases were gradually observed from CaCu2.95Ti4O12 (Cu-05). The Cu-related, especially Ti-related phase content in the small heterogeneous grains embedding around the large grains, initially increased and then decreased with Cu reducing with CaCu2.9Ti4O12 (Cu-10) as the critical composition. The novel enhancement of the εhigh′ value up to 4.96 × 105 in Cu-10 was attributed to the enhanced Maxwell-Wagner-type relaxation related to the small grains heterogeneity increase and the surface roughness reduction. The voltage–current nonlinearity of CCTO was attributed to the internal barrier layer capacitor (IBLC) model and surface effect as the Cu content reduced from Cu-10. Besides, an interesting backward phenomenon found in the J-E curves was also discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
