Ceramics-Silikáty 53 (3) 189-194 (2009)

DIELECTRIC AND PIEZOELECTRIC PROPERTIES OF COMBINATORY EFFECT OF A-SITE ISOVALENT AND B-SITE ACCEPTOR DOPED PLZT CERAMICS

K. Ramam, K. Chandramouli

This investigation highlights the influence of isovalent Sr or acceptor Mn modified PLZT near morphotrophic phase boundary for phase formation, microstructure, density, dielectric and piezoelectric properties. [Pb_0.9896-yLa_0.0104Sr_y][Zr_0.529Ti_0.471]_0.9949 Mn_0.005O₃ (PLSZMT) where y = 0, 0.2, 0.4, 0.6, 0.8 and 1 mol.%, polycrystalline solid solutions were synthesized by solid state reaction method. X-ray diffraction patterns indicated that undoped composition had shown coexistence of both rhom-bohedral and tetragonal phases while increasing Sr content resulted in phase shift to tetragonal phase. Grain size and apparent density enhanced with the increasing Sr content up to y = 1 mol.%. The optimum ε_RT, d₃₃ and kp were observed aty = 1 mol.%, respectively which could be suitable for piezoelectric applications.

Keywords: Electroceramics; Micro and Nanostructure; Dielectrics; Piezoelectrics