Smart Materials: The Functional Properties of Ceramic/Polymer Composites and their Relation to Sol-Gel Powder Preparation

摘要

Ferroelectric powders of lead titanate (PT) and calcium modified lead titanate (PTCa) were prepared by the sol-gel process. the gels were dried and heat treated near 500 deg. C (crystallisation temperature) using various procedures. The final ceramic powders were mixed with a polymer, in this case P (VDF-TrFE), 50/100 in volume and films of about 100 μm were obtained by hot pressing, The DC conductivity of the composite films at high fields (＞10 MV/m) seems to be dependent on the crystallisation process to which the sample was submited. The electroactive properties of the composites were studied.