Radial Mode Piezoelectric Response of La Modified Lead Zirconate Titanate in Morphotropic Phase Boundary Region

Room temperature radial mode piezoelectric response of Lanthanum modified Lead Zirconate Titanate (Pb(Zr0.57Ti0.43)O3+X at%La) (PLZT) is characterized by Vector Impedance Spectroscopy. Piezoelectric parameters (electromechanical constants KP, K31, elastic compliance sE11, strain constants d31, dh, voltage constant g31and planar piezoelectric constants radial mode coupling constant kp, piezoelectric constant ep31and mechanical constant cp11) have been determined for La doping ranging from 3 to 12 at%. Piezoelectric parameters KP, kp, d33and d31peak at 5–6 at%of La while dielectric constants˜T33,˜P33and piezoelectric constant ep31peak at 8 at%. An average value of Poisson's ratioσEis found to be 0.34±0.01. The conductivity of PLZTs follows the universal behavior.