Fine grains ceramics of PIN-PT, PIN-PMN-PT and PMN-PT systems: Drift of the dielectric constant under high electric field

Lead- based ferroelectric ceramics with ( 1 - x) Pb( B-1 B-2) O-3 - xPbTiO(3) formula have emerged as a group of promising materials for various applications like ultrasonic sonars or medical imaging transducers. ( 1 - x) PMN - xPT, ( 1 - x) PIN - xPT and ternary solutions xPIN yPMN - zPT ceramics are synthesised using the solid state reaction method. Our objective is to achieve higher structural transition temperatures than those of PMN - PT ceramics with as good dielectric, piezoelectric and electromechanical properties. Ceramics capacitance and loss tangent are measured when the ac field of measurement increases up to E = 500 V/ mm. Behaviours of these materials under ac field are related to their coercive field and Curie temperature. (c) 2006 Elsevier B. V. All rights reserved.