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Original Articles

Influence of dipole defects on polarization switching in the vicinity of a crack in relaxor ferroelectrics

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Pages 251-260 | Received 30 May 2009, Accepted 13 Jan 2010, Published online: 12 Mar 2010
 

Abstract

Simulations of the polarization switching process near the tip of an edge crack in relaxor ferroelectrics subjected to external electric field have been carried out by employing the time-dependent Ginzburg–Landau theory and the phase-field method. The electric boundary conditions of the crack and the material are assumed to be impermeable and isotropic, respectively. The interaction between dipole defects and the crack and the influence of the dipole defect concentration on the switching process are discussed. The results obtained show that, in relaxor materials, polarization switching in the vicinity of the crack tip is suppressed, and the electric field distribution is not symmetric with respect to the crack surface. These results arise on account of the interaction between dipole defects and the crack and the inhomogeneous electric field induced by dipole defects. Moreover, the polarization switching rate and switching zone area decrease with an increase of dipole defect concentration.

Acknowledgements

Support from the Research Grants Council of Hong Kong Special Administrative Region, China (Project Nos HKU 716007E and HKU 716508E), is acknowledged.

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