Dielectric and piezoelectric properties of relaxor ferroelectrics in the solid solution, formulated (l-x)(Pb1-1.5yLay)(Mg1/3Nb2/3)— ϗ PbTiO3. have been investigated. The dielectric properties show typical first order ferroelectric behavior for PT ≥ 35% and relaxor type below being indicative of the morphotropic phase boundary. Lanthanum doping resulted in reduction of grain size and shifting of the Tc (Curie Temperature)—25 °C/mole% dounward in PMNPT polycrystalline ceramics. The optimum value of piezoelectric constant. d33, obtained was 560 pC/N for compositions near the morphotropic phase boundary. Based on this investigation, La doped PMN-PT compositions appear to be promising candidates. for fine grain size piezoelectrics. pyroelectric bolometers, and through hot pressing or hot isostatic pressing. for electro-optic applications.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics