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

Author

Namchul Kim
Wayne Huebner, Missouri University of Science and TechnologyFollow
SeiJoo Jang
Thomas Richard Shrout

Abstract

Dielectric and piezoelectric properties of relaxor ferroelectrics in the solid solution, formulated (1-x)(Pb_1-1.5yLa_y)(Mg_1/3Nb_2/3)-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 T_c (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.

Recommended Citation

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 https://doi.org/10.1080/00150198908017366

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0015-0193

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1989 Taylor and Francis, All rights reserved.

Publication Date

01 May 1989