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January 26th, 2010

Enhancement of Giant Dielectric Response in CaCu3Ti4O12 Ceramics by Zn Substitution

Published on January 26th, 2010 | By: pwray@ceramics.org

Volume 93 Issue 1, Pages 184 – 189

 

Lei Ni, Xiang Ming Chen
Published Online: Oct 29 2009 4:24PM
DOI: 10.1111/j.1551-2916.2009.03384.x

 

ABSTRACT

Zn-substituted CaCu3Ti4O12 ceramics were synthesized by solid-state sintering. Their microstructures and dielectric properties were investigated. Ca(Cu1-xZnx)3Ti4O12 single-phase structures were obtained up to x=0.1, and the Cu+/Cu2+ and Ti3+/Ti4+ mixed-valent structure was enhanced with increasing Zn substitution. The giant dielectric response was significantly enhanced by Zn substitution. The dielectric constant increased with increasing x, and a giant dielectric constant plateau as high as ∼9 × 104 was achieved for x=0.1 at 10 kHz, while that for x=0 was ∼3 × 104. The enhanced giant dielectric response was profoundly concerned with the modified mixed-valent structure.

 

Online Access to Journal of the American Ceramic Society


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