Journal of Applied Physics · 2013 · 172 citations · 35 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsSolid State PhysicsDielectric CeramicsDielectricsFerroelectric CeramicsFerroelectric MaterialsPiezoelectric CeramicsPiezoelectric MaterialsElectrostrictionField-induced StrainLead-free Piezoelectric CeramicsPiezoelectric PropertiesPiezoelectric StrainPiezoelectricityPoling BehaviorRelaxor Ferroelectric Ceramics
Dielectric, ferroelectric, piezoelectric, and strain properties of lead-free Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) were investigated. A crossover from a nonergodic relaxor to an ergodic relaxor state at room temperature, accompanied by a giant electric-field-induced strain, was observed at 5 at. % Sn doping. Switching dynamics monitored during a bipolar poling cycle manifested that the observed giant strain originates from incipient piezoelectricity. When Sn doping level reached 8 at. %, BNKT exhibited an electrostrictive behavior with a highly temperature-insensitive electrostrictive coefficient of Q11 = 0.023 m4 C−2.
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