Ca1−xSrxCu3Ti4O12 (x=0, 0.1, and 0.2) ceramics were fabricated and their dielectric properties were investigated. It was found that the dielectric constant significantly decreased with the increase of Sr content at low temperature region (<250 K) and remained almost unchanged at high temperature region (>250 K). Three sets of relaxation peaks were observed in electric modulus plots, which were considered to be associated with grains, domain boundaries, and grain boundaries, respectively. Through the analysis of the heights and calculated activation energies of the relaxation peaks, it is strongly believed that the suppressed dielectric constant is related to the change of domain boundaries with Sr doping. ©2007 American Institute of Physics
W. Li et al., "Dielectric Response of Sr Doped CaCu₃Ti₄O₁₂ Ceramics," Applied Physics Letters, American Institute of Physics (AIP), Mar 2007.
The definitive version is available at http://dx.doi.org/10.1063/1.2713167
Mechanical and Aerospace Engineering
National Natural Science Foundation (China)
United States. Office of Naval Research
Keywords and Phrases
Calcium Compounds; Copper Compounds; Dielectric Relaxation; Doping; Grain Boundaries; Permittivity; Strontium Compounds
Article - Journal
© 2007 American Institute of Physics (AIP), All rights reserved.