Abstract
Powder agglomeration is a major problem in the fabrication of calcium and lanthanum modified lead titanate/vinylidene fluoride-trifluoroethylene [PCLT/P(VDF-TrFE)] 0–3 nanocomposites. To ensure uniform dispersion of the nanocrystalline PCLT powder in the P(VDF-TrFE) matrix, the powder is often dispersed in a liquid (e.g. methyl-ethyl ketone) placed in a high power ultrasonic bath. In this study, PCLT nanocrystalline powder derived from a sol-gel process was dispersed in various liquids placed in an ultrasonic bath for different periods of time tu. The size and specific surface area of the particles were measured as functions of tu. By choosing a good dispersing agent and an appropriate t, PCLT/P(VDF-TrFE) nanocomposites with a uniform dispersion of nanosized particles can be prepared. The dielectric, piezoelectric and pyroelectric properties of these composites have been investigated.
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