J. Phys. IV France 126 (2005) 77-80
Temperature dependence of piezoelectric coefficients of 0.71 Pb(Mg Nb )O0.29 PbTiO3 piezoelectric single crystalsM. Sulc and M. Pokorny
Technical University of Liberec, Halkova 6, 461 17 Liberec, Czech Republic
Piezoelectrically induced displacements were measured by the laser interferometry method for multidomain-engineered 0.71 Pb(Mg1 / 3Nb2 / 3) O3-0.29 PbTiO3 single crystals in the temperature range 260 K-333 K. It was confirmed that this single crystal has large piezoelectric coefficients if the poling is done along the -direction. Assuming an effective tetragonal symmetry, we determined the piezoelectric d31 coefficient by measuring the displacement on (100) and (110) crystal faces. Coefficient d31 = - 611 pC/N was calculated for the -direction at room temperature. Its value is higher at 330 K (-820 pC/N). Piezoelectric coefficient d31 measured on a second sample in the -direction exhibited a higher value than the previous one, about -808 pC/N at room temperature, -1180 pC/N at 331 K and -605 pC/N at 262 K. Temperature dependencies of piezoelectric coefficient d33 were also investigated. The second sample exhibits about 15% higher d33 than the first one -1598 pC/N and 1390 pC/N at RT. This difference is 50% -2355 pC/N and 1600 pC/N at 331 K.
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