Applied Physics Letters · 2008 · 244 citations · 10 references
Natural SciencesMaterials SciencePhysicsCeramic MaterialsCeramicsSolid State PhysicsFerroelectric CeramicsFerroelectric MaterialsPhase TransitionsPiezoelectric CeramicsPiezoelectric MaterialsField-induced TransitionsLead-free FerroelectricsLead-free Piezoelectric CeramicsLead-free PiezoelectricsMorphotropic Phase BoundaryPiezoelectric EffectPiezoelectric PropertiesPiezoelectricity
The electromechanical behavior of (1−x)Bi0.5Na0.5TiO3–xK0.5Na0.5NbO3 (BNT-KNN) lead free piezoelectric ceramics is investigated for 0⩽x⩽0.12 to gain insight into the antiferroelectric-ferroelectric (AFE-FE) phase transition on the basis of the giant strain recently observed in BNT-based systems. At x≈0.07, a morphotropic phase boundary (MPB) between a rhombohedral FE phase and a tetragonal AFE phase is found. While the piezoelectric coefficient is largest at this MPB, the total strain further increases with increasing KNN content, indicating the field-induced AFE-FE transition as the main reason for the large strain.
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Yasuyoshi Saito, Hisaaki Takao, Toshihiko Tani et al. · Nature · 2004 · 5.5K citations