Effect of Microstructure and Texture on the Macroscopic Piezoelectric Response of Ferroelectric Barium Titanate and PZN—PT Films

A two-dimensional (2D) plane-strain finite element method (FEM) model of polycrystalline film wherein the film thickness is much greater than the microstructure is presented. A finite element based solution for the rigorous homogenization problem to quantify the microstructural features, such as ori...

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Bibliographic Details
Published in:Journal of intelligent material systems and structures 2009-01, Vol.20 (2), p.193-204
Main Authors: Jayachandran, K.P., Guedes, J.M., Rodrigues, H.C.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Physics
Piezoelectricity and electromechanical effects
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Summary:A two-dimensional (2D) plane-strain finite element method (FEM) model of polycrystalline film wherein the film thickness is much greater than the microstructure is presented. A finite element based solution for the rigorous homogenization problem to quantify the microstructural features, such as orientation and spatial distribution of crystallographic grains on the global piezoelectric response of unclamped polycrystalline ferroelectric films is implemented. The homogenized material parameters of the piezoelectric films are calculated using the FEM by the solution of the coupled equilibrium electrical and mechanical fields in the linear domain. The dependence of macroscopic electromechanical properties on domain orientation and texture of single-crystalline as well as polycrystalline ferroelectric BaTiO3 and PZN—PT films are demonstrated based on this model. The orientation dependent anisotropy of homogenized electromechanical moduli of polycrystalline and single-crystalline films are examined. The polycrystalline films can be improved in their out-of-plane global piezoelectric behavior by engineering microstructures that favor {111} texture in the case of BaTiO3 and {001} texture in the case of PZN—PT.
ISSN:1045-389X
1530-8138
DOI:10.1177/1045389X08091118