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The influence of the MnO content on the microstructure and the electrical response of liquid-phase sintered ZnO–V2O5 varistor ceramics wereanalysed using A.C. impedance spectroscopy on samples prepared via the conventional solid state route.The impedance spectra were analysed with the help of one model equivalent circuit at high frequencies and another at low frequencies, involving both resistor and...
Bi2/3Cu3Ti4O12 (BCTO) ceramics with pure perovskite phase were successfully prepared by traditional solid-state reaction technique. Uniformly distributed and dense grains with the grain size of 2–3μm were observed by SEM. A giant low-frequency dielectric permittivity of ~3.3×105 was obtained. The analysis of complex impedance revealed that Bi2/3Cu3Ti4O12 ceramics are electrically heterogeneous. There...
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