Ferroelectric Domain Controlled Pb[(Zn_(1/3)Nb_(2/3))_(0.91)Ti_(0.09)]O_3 Single Crystal with Giant Electromechanical Coupling Factor of k_(31) Mode and Piezoelectric d_(31) Constant

摘要

Temperature and poling field dependences of the properties of large high-quality piezoelectric single crystals of Pb[(Zn_(1/3)Nb_(2/3))_(0.91)Ti_(0.09)]O_3 (PZNT91/09) grown by the Bridgman method were measured. The single crystals poled along [001] of the original cubic direction possess giant electromechanical coupling factor k_(31) over 80 percent and piezoelectric d_(31) constant nearly- 1700 pC/N. These giant k_(31) and d_(31) constants results from the control of ferroelectric domain configuration. PZNT91/09 multi-domain single crystal became single-domain in the directions parallel and perpendicular to the poling field resulting in the appearance of giant k_(31) and d_(31).