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Giant Dielectric, Low Loss Tangent and Non-Ohmics Properties of CaCu3Ti4.7O12 Ceramics Prepared by Polymer Pyrolysis Method

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Sunan Nonglek,Sasitorn Putjuso, and Thanin Putjuso

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In this work, CaCu3Ti4.7O12 (CCT4.7O) powder was prepared by polymer pyrolysis

method. The influence of phase composition and microstructure were characterized using

X‑ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that

the TiO2 secondary phase has a remarkable on the microstructure, dielectric loss tangent

(tand) and dielectric constant (e') of CCT4.7O ceramics, respectively. Interestingly, low

dielectric loss tangent of ~ 0.03 and giant dielectric constant of 31,908 with temperature

coefficients less than ± 15% in the temperature range of −50 – 90 ºC are observed in

a ceramic sintered at 1060 ºC for 10 h (CCT4.7O-2). Both of ceramics sintered at 1060 ºC

for 6 h (CCT4.7O-1) and 10 h (CCT4.7O-2) display a non linear current voltage with the

non-linear coefficient (a) and breakdown field (Eb) values of 6.4, 5.6 and 1554, 1020,

respectively. The dielectric constant, electrical response of grain boundaries, and related

nonlinear current-voltage behavior are found to be associated with the microstructure of

CCT4.7O ceramics.

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Dielectric; dielectric loss tangent; non-ohmics; polymer pyrolysis