Ferroelectrics · 1994 · 19 citations · 2 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsMaterials CharacterizationDielectricsFerroelectric CeramicsFerroelectric MaterialsPiezoelectric CeramicsPiezoelectric MaterialsStress-strain BehaviorMorphotropic Phase BoundaryPiezoelectric CharacterizationPiezoelectric CoefficientsPiezoelectric EffectPiezoelectric PropertiesPiezoelectric StrainPiezoelectricityPolar Axis Measurements
Abstract The main characteristics of a PZT ceramic, such as the piezoelectric charge coefficient or the permittivity, may change drastically when the ceramic undergoes a high uniaxial stress along its polar axis in the 10 to 150 MPa range. A special device has been built to measure accurately and directly the d33 and ϵT 33 parameters of a PZT rod with a superimposed controlled uniaxial stress. Experimental results are proposed showing the uniaxial stress dependence on several PZT samples near the morphotropic phase boundary. These results point out the influence of the Zr/Ti ratio on the uniaxial stress and show that according to a given working stress range, it could be possible to optimize the evolution of the piezoelectric coefficients such as d33 or ϵT 33.
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