Title

Dielectric and Piezoelectric Properties of Lanthanum-Modified Lead Magnesium Niobium-Lead Titanate Ceramics

Abstract

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.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

150193

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1989 Taylor and Francis, All rights reserved.

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