Effects of PVA organic binder on electric properties of CaCu3Ti4O12 ceramics

CaCu3Ti4O12 ceramics with incorporation of polyvinyl alcohol (PVA) are prepared from the powder synthesized by a solid state reaction. Their electric and dielectric properties are investigated in this study. It is found that adding PVA can dramatically reduce the dielectric loss of CCTO in the low frequency region, and stabilize the dependence of dielectric constant on the measuring frequency. The minimum dielectric loss of 0.045 is obtained from the sample with 8 wt% PVA. The nonlinear coefficient (α) and breakdown electric field (Eb) increase with an increase of PVA binder.

► Adding PVA makes CuO locate in the as-sintered samples.
► PVA stabilizes the frequency dependence of dielectric constant.
► PVA leads to a decrease of dielectric loss in the low frequency region.
► The nonlinear coefficient increases with the increasing PVA concentration.
► The breakdown electric field increases with the increasing PVA concentration.