Electromechanical properties of tetragonal Pb(In1∕2Nb1∕2)O3−Pb(Mg1∕3Nb2∕3)O3−PbTiO3 ferroelectric crystals

摘要

The ferroelectric, dielectric, elastic, piezoelectric, and electromechanical properties of tetragonal Pb(In1∕2Nb1∕2)O3−Pb(Mg1∕3Nb2∕3)O3−PbTiO3 (PIN–PMN–PT) crystals were investigated. The single domain piezoelectric coefficients d33, d15, and d31 were found to be 530, 2350, and −200 pC∕N, respectively, with electromechanical coupling factors k33, k15, and k31 being on the order of 0.84, 0.85, and 0.58. The mechanical quality factor Q for longitudinal mode was found to be >700, with high coercive field (Ec) being on the order of 10 kV∕cm. The temperature and dc bias electric-field characteristics of single domain tetragonal PIN–PMN–PT crystals were also investigated. In contrast to [001] oriented domain engineered rhombohedral crystals, tetragonal PIN–PMN–PT crystals exhibited broader temperature usage range and higher thermal∕electric field stability, with improved coercive field and mechanical quality factor.