Dielectric properties of CaCu3Ti4O12/Pb(Zr0.52Ti0.48)O3 composite ceramics

Abstract A new composite ceramics of CaCu3Ti4O12/Pb(Zr0.52Ti0.48)O3 have been designed and fabricated to reduce the dielectric loss with certain higher dielectric constant. Pb(Zr0.52Ti0.48)O3 was coated on the surface of CaCu3Ti4O12 particles, and then the composite particles were sintered to obtain CaCu3Ti4O12/Pb(Zr0.52Ti0.48)O3 composite ceramics using conventional technologies which include the spark plasma sintering. The phase composition and microstructure were studied by means of X-ray diffraction and scanning electron microscopy. The result shows that the ceramics are composed of CaCu3Ti4O12, Pb(Zr0.52Ti0.48)O3 phases (this phase mainly exists at the grain boundary) and some impurities. It is also found that the grain size and the grain shape of composite ceramics are greatly affected by interfacial coating of Pb(Zr0.52Ti0.48)O3. The impedance spectrum measurement result shows that the CaCu3Ti4O12/Pb(Zr0.52Ti0.48)O3 composite ceramics with the Pb(Zr0.52Ti0.48)O3 content of 20% has the highest dielectric constant and the lowest dielectric loss.