Dielectric and piezoelectric properties of lanthanum-modified lead magnesium niobium-lead titanate ceramics

N. Kim, W. Huebner, S. J. Jang, Thomas R. Shrout

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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.

Original languageEnglish (US)
Pages (from-to)341-349
Number of pages9
Issue number1
StatePublished - May 1 1989


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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