Dielectric properties and current-voltage nonlinear behavior of Al2O3-doped CaCu3Ti4O12 ceramics
WANG Ya-juan, CAO Lei, JING Hui-xia, YANG Jing-na, ZHANG Yu, WU Yi, LIU Peng*
(College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
The CaCu3Ti4O12 ceramics doped with various Al2O3 (0, 0.15, 0.30 and 0.40) contents were fabricated by a solid-state reaction method. The results showed that, Al2O3 additive has not only reduced the dielectric loss of low frequency range but also significantly raised the breakdown voltage. When Al2O3 doping concentration x was 0.30, the specimen has achieved the best comprehensive electrical properties, including a dielectric constant (εr) of 2 000, dielectric loss (tan δ) of 0.04, breakdown voltage (Eb) of 1 084 V/mm, and a nonlinear coefficient of 4.6.
KeyWords:
breakdown voltage; I-U behavior; Giant dielectric constant
