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Title:Domain Switching and Microcracking in Ferroelectric Single Crystals and Polycrystalline Ceramics
Author(s):Tan, Xiaoli
Doctoral Committee Chair(s):Zhong, Sheng
Department / Program:Materials Science and Engineering
Discipline:Materials Science and Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Engineering, Materials Science
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.
Issue Date:2002
Type:Text
Language:English
Description:147 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2002.
URI:http://hdl.handle.net/2142/82733
Other Identifier(s):(MiAaPQ)AAI3070453
Date Available in IDEALS:2015-09-25
Date Deposited:2002


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