Generic Influences of Charged Defects on the Structure-Property Relationships of Modified Ferroelectric Barium Titanate and Antiferroelectric Sodium Niobate
Zhang, Ruitao
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https://hdl.handle.net/2142/82919
Description
Title
Generic Influences of Charged Defects on the Structure-Property Relationships of Modified Ferroelectric Barium Titanate and Antiferroelectric Sodium Niobate
Author(s)
Zhang, Ruitao
Issue Date
1999
Doctoral Committee Chair(s)
Dwight Viehland
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
A preliminary two-dimensional cellular automaton model of defect distribution was proposed based on space charge neutrality considerations. It used only pairwise nearest-neighbor interactions and neglected the elastic effects associated with lattice distortions. Simulations demonstrated a general distribution pattern for charged defects. With increasing substituent concentration, more and larger defect clusters formed, which might be related with the formation of polar nanodomains in the modified ferroelectric BaTiO3. The influence of charged defects on field-induced AFE-FE transition was discussed in terms of elastic strain effects.
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