Piezoelectric and dielectric properties of barium titanate polycrystals

Abstract eng:
This work deals with the electromechanical problems of poled barium titanate (BaTiO3) polycrystals with oxygen vacancies. A phase field model is developed for ferroelectric polycrystals, coupled with the time-dependent Ginzburg-Landau theory and the oxygen vacancies diffilsion, to demonstrate the interaction between oxygen vacancies and domain evolutions. To generate grain structures, the phase field model for grain growth is also used. The strain vs stress curve and strain vs electric field curve are calculated, and the effects of grain size and oxygen vacancy density on the piezoelectric and dielectric properties of the BaTiO3 polycrystals are discussed.

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