title: Stability of morphotropic (110) oriented 0.65PMN-0.35PT single crystals.
abstract: Electromechanical properties of (1-x)Pb (Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) single crystals with x = 0.35 were investigated as a function of different external disturbances. The polarization dependence on the electromechanical properties was first studied in order to determine the best polarization path. The correlation with X-ray measured phase ratio is presented and shows that the maximum of electromechanical properties may be correlated with a minimum rhombohedral/tetragonal phase ratio. Temperature, stress, electric field, and time (aging) stability was studied in order to determine performance-limiting factors of these materials. The rhombohedral/tetragonal phase transition is observed on temperature (80 degrees C), inducing a decrease of the electromechanical coupling factor (from 85% to 50%); but the whole properties are recovered while returning to room temperature. Stress measurement shows a large depoling of sample for stresses above 30 MPa. The PMN-PT single crystals were found to be surprisingly stable during aging, except for mechanical and dielectric losses. The same tendency was found on alternating current (AC) electric field dependence.
authors.affiliation: Electrical Engineering Laboratory, Insa de Lyon, 69621 Villeurbanne, France. gael.sebald@insalyon.fr
authors.forename: Gaël
authors.initials: G
authors.lastname: Sébald
authors.forename: Laurent
authors.initials: L
authors.lastname: Lebrun
authors.forename: Daniel
authors.initials: D
authors.lastname: Guyomar