Abstract
In this paper, the ceramic compositions (1 - x)Pb1_ w _ y La w Sr y (Zr z Ti 1 _ z ) (1_w/4) O 3 -xBaTiO 3 , where x = 0.15, 0.25, 0.35 and 0.45, fabricated through solid state reaction method were investigated for phase formation, microstructure, density, dielectric and piezoelectric properties. The combination of the two perovskite structured stoichiometric compositions (i.e., isovalent Sr 2+ modified PLZT and BaTiO 3 ) indicated that tetragonality enhanced further due to BaTiO 3 concentration in PLSZT lattice. The BaTiO 3 in PLSZT ceramics were homogeneously distributed within the two perovskite structured solid solutions. The dielectric characterization indicated that e RT enhanced while tan δ RT and T c decreased with increasing BT additions into PLSZT perovskite. The maximum e RT = 2986 and e Tc = 21468 were found in 0.55PLSZT-0.45BT ceramic system. The piezoelectric properties were influenced by both BaTiO 3 and Sr 2+ modified PLZT perovskite. The influence of BT modified PLSZT ceramics showed significant variations that has been discussed. The piezoelectric properties remarkably enhanced with maximum (kp = 0.541 and d 33 = 518 pC/N) values in the 0.55PLSZT-0.45BT composition and thus, could be a promising candidate among this series for possible capacitor, sensor and actuator applications.
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