Journal of Materials Science

, Volume 44, Issue 19, pp 5383–5392 | Cite as

Ferroelastic interactions in bilayered ferroelectric thin films

  • R. Mahjoub
  • V. Anbusathaiah
  • V. NagarajanEmail author


We present a theoretical investigation of the elastic interactions in a heteroepitaxial bilayer consisting of a (001) tetragonal PbZrxTi1−xO3 and (001) rhombohedral PbZr1−xTixO3 on a thick (001) passive substrate. Analytical expressions for the elastic interaction energies between the layers and the resultant ferroelastic twin formation have been derived as a function of the lattice misfit strain (between layers and the substrate), composition of the ferroelectric and thickness. It is found that the elastic coupling between the tetragonal and rhombohedral layers leads to the equilibrium domain fraction in the tetragonal layer several time larger than that in single-layer films of similar thickness. Most critically, the model finds a significant change in the ferroelastic domain volume fraction in the presence of an applied electric field and hence enhanced piezoelectric properties compared to single-layered epitaxial PZT thin films.


External Electric Field Free Energy Density Piezoelectric Coefficient Total Free Energy Misfit Strain 



We would like acknowledge financial support from ARC DP0666231 and UNSW Faculty Research Grant.


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringUniversity of New South WalesSydneyAustralia

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