Abstract
The electrical properties and dielectric response in Na1/2Y1/2Cu3Ti4O12 ceramic prepared by conventional solid-state reaction method and sintered at 1,090 °C for 5 h were investigated as functions of frequency and temperature. Main phase of Na1/2Y1/2Cu3Ti4O12 with CaCu3Ti4O12-like crystallographic structure and CuO secondary phase were observed in the X-ray diffraction pattern. Abnormal grain growth was observed just as observed in CaCu3Ti4O12 ceramics. The Na1/2Y1/2Cu3Ti4O12 ceramic exhibits a high e′ of ~2.04 × 104 at 20 °C and 1 kHz and low tan δ (with the minimum 0.080 at 5 kHz). Impedance spectroscopy analysis reveals that Na1/2Y1/2Cu3Ti4O12 ceramic is electrically heterogeneous, consisting of semiconducting grains and insulating grain boundaries. Giant e′ response in Na1/2Y1/2Cu3Ti4O12 ceramic is therefore attributed to an internal barrier layer capacitor effect.
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