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Phase Transition Temperatures and Piezoelectric Properties of (Bi<sub>1/2</sub>Na<sub>1/2</sub>)TiO<sub>3</sub>–(Bi<sub>1/2</sub>K<sub>1/2</sub>)TiO<sub>3</sub>–BaTiO<sub>3</sub> Lead-Free Piezoelectric Ceramics
205
Citations
13
References
2006
Year
Materials ScienceHigh Temperature MaterialsEngineeringFerroelectric ApplicationDepolarization TemperatureFunctional CeramicApplied PhysicsCondensed Matter PhysicsFerroelectric MaterialsCeramics MaterialsPhase Transition TemperaturesPiezoelectric MeasurementsPiezoelectric MaterialsPiezoelectric PropertiesPiezoelectricityCrystallographyPiezoelectric MaterialFunctional Materials
The phase transition temperatures of x(Bi1/2Na1/2)TiO3–y(Bi1/2K1/2)TiO3–zBaTiO3) [x+y+z=1, y:z=2:1] [abbreviate to BNBK2:1(x)] ceramics were investigated using electrical measurements. We discussed the determination of the depolarization temperature, Td, and defined the Td for (Bi1/2Na1/2)TiO3 (BNT)-based solid solutions. We also determined the rhombohedral–tetragonal phase transition temperatures, TR–T, for BNBK2:1(x), and verified them using dielectric and piezoelectric measurements. It was demonstrated that TR–T corresponded with Td at x=0.94. The existence of an intermediate phase with ferroelectric and antiferroelectric properties at temperatures higher than the Td around the morphotropic phase boundary (MPB) was also revealed.
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