Dielectric and Piezoelectric Properties of Lanthanum-Modified Lead Magnesium Niobium-Lead Titanate Ceramics
Dielectric and piezoelectric properties of relaxor ferroelectrics in the solid solution, formulated (1-x)(Pb1-1.5yLay)(Mg1/3Nb2/3)-x 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% downward in PMNPT polycrystalline ceramics. The optimum value of piezoelectric constant, d 33, 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.
N. Kim et al., "Dielectric and Piezoelectric Properties of Lanthanum-Modified Lead Magnesium Niobium-Lead Titanate Ceramics," Ferroelectrics, vol. 93, no. 1, pp. 341-349, Taylor and Francis, May 1989.
The definitive version is available at http://dx.doi.org/10.1080/00150198908017366
Materials Science and Engineering
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