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Characterization of ZrO2/PZT Nanocomposites Ceramics Prepared by the Citrate Precursor Route

Lead zirconate titanate (PZT)-based nanocomposites embedded with ZrO2 nanoparticles were fabricated by citrate precursor route from metastable phases in situ. The effect of ZrO2 content on mechanical and piezoelectric properties of composites was investigated. m-ZrO2 particles covering 30-70 nm are dispersed homogenously inside the PZT matrix grain with stress strips around m-ZrO2 nanoparticles. The fracture mode changes from intergranular to intragranular with increasing the amount of ZrO2. Transformation toughening and nanoparticle dispersion toughening of ZrO2 contributed to the reinforcement of the PZT/ZrO2 nanocomposites. It is exciting to found that the mechanical properties as well as the piezoelectric properties were both increased compared with those of monolithic PZT when add a certain amount of ZrO2.