ELECTROMECHANICAL TESTING AND MODELING OF A PB(MG1 3NB2/3)O-3-PBTIO3-BATIO3 RELAXOR FERROELECTRIC/

Compressive prestress effects on the electrical and mechanical propert ies of relaxer ferroelectric materials were studied as a function of t emperature for several formulations of Pb(Mg1/3Nb2/3) O-3-PbTiO3-BaTiO 3 (PMN-PT-BT) ceramics. Experimentally measured polarization and strai n, induced by an ac electric field, decreased as compressive stress in creased, Effective Young's moduli also were measured under constant de electric fields, A significant decrease in modulus was observed with increasing field, The prestress and modulus experiments were modeled a nalytically using a proposed relaxer ferroelectric constitutive law, I n general, excellent agreement between the model and experiments was o btained, indicating that the model accurately predicted the coupled be havior of this relaxer ferroelectric material.