Domain Switching and Microcracking in Ferroelectric Single Crystals and Polycrystalline Ceramics
Tan, Xiaoli
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https://hdl.handle.net/2142/82733
Description
Title
Domain Switching and Microcracking in Ferroelectric Single Crystals and Polycrystalline Ceramics
Author(s)
Tan, Xiaoli
Issue Date
2002
Doctoral Committee Chair(s)
Zhong, Sheng
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
In polycrystalline piezoelectric ceramics, electric field-induced cracking occurred by intergranular fracture. The macroscopic path of the crack growth depended strongly upon the applied field and the poling direction. Analysis showed that cracks extended along the place of maximum normal strain. Mechanisms for the intergranular fracture were investigated by the in-situ TEM technique. During electrical cycling, transient dielectric breakdown and local melting in the amorphous grain boundary layers were the likely precursors to fracture. Assisted by the incompatible stresses, cavitation took place. The increase of the density and the linkage of these cavities weakened the grain boundary, leading to crack growth along the boundary.
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