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Combined effect of grain size and tensile stresses on the ferroelectric properties of sol-gel (Pb,La)TiO3 thin films

Published online by Cambridge University Press:  31 January 2011

M. Alguerá ,
M. L. Calzada ,
L. Pardo  and
E. Snoeck
M. Alguerá
Affiliation:
Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Cientificas, Cantoblanco 28049, Madrid, Spain
L. Pardo
Affiliation:
Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Cientificas, Cantoblanco 28049, Madrid, Spain
E. Snoeck
Affiliation:
Centre d'Elaboration des Materiaux et dés Etudes Strucuturales, Centre National de la Recherche Scientifique, BP4347, F-31055 Toulouse, France
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Abstract

Transmission electron microscopy has shown that the grain size of sol-gel-prepared lanthanum-modified lead titanate films increases from ∼100 to ∼1 μm when the excess of PbO in the precursor solution is reduced from 20 to 10 mol%. Switchable polarization is higher in the films with a smaller grain size. Profilometry and the temperature dependence of the dielectric permittivity indicate that films are tensile stressed by the substrate. The grain-size effect on polarization switching is explainedby taking into account this tensile stress, which is thought to induce some a-domain orientation and 90° domain wall clamping in the grains attached to the substrate.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4570 - 4580
Copyright
Copyright © Materials Research Society 1999

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