Preparation and characterisation of fine-grainedbarium lead titanate ceramics by spark plasmasintering technique

摘要

Barium lead titanate ferroelectric ceramic is a promising material for electronic devices at high frequencyand high temperatures. These fine-grained ceramics were obtained at a low sintering temperatureof 900℃ within a short sintering time by means of a new sintering method – spark plasma sintering(SPS). The ceramics are highly densified to >99% of the theoretical X-ray density with homogeneousmicrostructures, signifying that the SPS process is effective for the densifying of compacts and theinhibition of exaggerated grain growth. Temperature dependence of dielectric constant of SPS pelletsshows three times higher than the conventional sintering (CS) Ba_(0.8)Pb_(0.2)TiO_3 (BPT) pellet. The variationsin properties between SPS and CS materials are mainly because of the differences of the resultantmicrostructures, especially grain size, of the ceramics.