The effect of CaCu3Ti3.95Zr0.05O12 fillers on microstructure and dielectric behaviour of CaCu3Ti3.95Zr0.05O12/Polyimide composites

In the present study, the microstructure and dielectric properties of composites comprising Polyimide (PI) and CaCu3Ti4O12 (CCTO) or CaCu
3
Ti
3.95
Zr
0.05
O
12
(CCTZO) particles have been investigated. CCTO and CCTZO were employed separately and investigated comparatively. The effective dielectric constant of the composite containing 40vol.% CCTZO filler is over 50 at 40°C (10
²
Hz), which is substantially higher than that of the composite containing CCTO. For the composite containing 40vol.% CCTZO, the dielectric constant and the conductivity increases sharply with increasing temperature. The mechanism of high dielectric constant was investigated finally.