Abstract
The transverse piezoelectric coefficient d31* has been calculated for the domain engineered structures formed by poling rhombohedral 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-33PT) along the (001)C and (101)C directions (C: pseudocubic) using monodomain piezoelectric coefficients available in the literature. It is found that, although the longitudinal piezoelectric coefficient d33* is higher in the (001)C-poled (4R) domain engineered structure, the maximum transverse coefficient is higher (more negative) in the (101)C-poled (2R) structure; a maximum value of -1630 pm/V is calculated depending on the choice of transverse (x 1 ') direction of the as-cut crystal. Such high values of d 31 * are technologically exploitable e.g. in flextensional actuators (e.g. bimorphs), and cymbal actuators and sensors. Finally, for a different choice of x 1 ' in the 2R crystal, positive values of d31* (+700 pm/V) are predicted. This could be exploitable in 2-2 type piezoelectric/polymer composites for ultrasound applications.
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