Investigation on dielectric and piezoelectric characterization of PLSZT-BT ceramics

¹ Departmento de Ingenieria de Materials (DIMAT), Facultad de Ingenieria, Universidad de Concepcion, Concepcion, Chile
² Department of Physics, Andhra University, Visakhapatnam, India

Corresponding author: ramamk@udec.cl

Received: 9 December 2007
Revised: 16 February 2008
Accepted: 22 February 2008
Published online: 30 April 2008

Abstract

In this paper, the ceramic compositions ()Pb_1−w−yLa_wSr_y(Zr_zTiO₃-xBaTiO₃, 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 Sr²⁺ modified PLZT and BaTiO₃) indicated that tetragonality enhanced further due to BaTiO₃ concentration in PLSZT lattice. The BaTiO₃ in PLSZT ceramics were homogeneously distributed within the two perovskite structured solid solutions. The dielectric characterization indicated that enhanced while and T_c decreased with increasing BT additions into PLSZT perovskite. The maximum = 2986 and = 21468 were found in 0.55PLSZT-0.45BT ceramic system. The piezoelectric properties were influenced by both BaTiO₃ and Sr²⁺ modified PLZT perovskite. The influence of BT modified PLSZT ceramics showed significant variations that has been discussed. The piezoelectric properties remarkably enhanced with maximum ( and 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.