Abstract
The dielectric and piezoelectric properties of (1 − x)[(Pb0.988La0.012)(Zr0.53Ti0.47)0.997O3]–x[Pb0.557Ba0.38La0.022Bi0.02Nb2O6] composite system consisting of both perovskite tetragonal (4 mm) and tungsten bronze orthorhombic (m2 m) phases, prepared in situ by mechanical activation method are presented and discussed in relation to x (PBLBiN) variation. The crystal structure and morphology of the composites were examined with X-ray diffraction and scanning and transmission electron microscopes. Scanning electron micrographs showed structural homogeneity. Dielectric and piezoelectric properties were studied as a function of x to characterize electrical properties of composites. The presence of two trivalent ions (La3+ and Bi3+) in x resulted in high dielectric and piezoelectric properties. The possible mechanisms of mechanical activation technique of (1 − x)PLZT–xPBLBiN nanoceramic composite system are discussed. The optimum dielectric and piezoelectric properties were found in x = 0.6 in (1 − x)PLZT–xPBLBiN nanoceramic composite system which could be ideal for electromechanical and energy harvesting applications.
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