Domain Switching and Microcracking in Ferroelectric Single Crystals and Polycrystalline Ceramics

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Tan, Xiaoli

Contributors dc:contributor

• Zhong, Sheng

• Engineering, Materials Science

Language dc:language

eng

Identifier

(MiAaPQ)AAI3070453

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/82733