Dielectric properties and electrical conductivity of CaCu₃Ti₄O₁₂ ceramics doped with Zr⁴⁺

Abstract

CaCu₃Ti₄O₁₂ (CCTO) ceramics doped with Zr⁴⁺ were prepared. Effects of Zr⁴⁺ on microstructure, dielectric properties and conduction behavior of CaCu₃Ti_4−xZr _xO₁₂ (x=0, 0.05, 0.10, 0.20) ceramics were studied in the frequency range of 10–10⁶ Hz. Grain size and dielectric loss of Zr⁴⁺-doped CCTO ceramic decreased compared with pure CCTO. The loss tangent (tanδ) of CaCu₃Ti_4−xZr _xO₁₂ (x=0.20) ceramic droped to 0.05 at a frequency of 1 kHz, which was reduced by 55% compared with pure CCTO ceramic. The mechanism effect of electrical conductivity on dielectric loss of Zr⁴⁺-doping CCTO ceramics was also discussed.

Keywords

CaCu₃Ti₄O₁₂ / sintering / dielectric properties / electrical conductivity

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