Masters Theses

Chunhong Zhou

Keywords and Phrases

Antiferroelectric ceramics

Abstract

"To maximize energy storage in capacitors, materials that possess large dielectric constants and high breakdown strength are required. Antiferroelectric (AFE) compositions offer the potential for high energy storage densities, which are associated with a field induced AFE - FE transformation. However, the change in dielectric constant at the phase transition may result in significant field enhancement effects near pores and electrode edges that may lead to dielectric breakdown. In addition, significant strains are associated with this phase transformation, which may present reliability problems in applications where repeated charging and discharging are required.

PLZT (lead lanthanum zirconate titanate) 2/95/5 and 6/100/0, which have sharp and diffuse phase transitions, respectively, were selected for evaluation. The materials were fabricated using a traditional mixed oxide method, but it was not possible to prepare materials with adequate breakdown strengths for further mechanical reliability studies. Therefore, attention was given to factors that may lead to breakdown in these materials, i.e., field enhancements in the vicinity of pores and electrode edges.

The commercial software package Electro was used to carry out field enhancement factor and energy storage studies. Field enhancement effects for pores of various shapes (non-spherical) and orientations in both linear and non-linear dielectrics were studied. The simulation studies completed also include investigations of the influence of capacitor geometry on field enhancement/field management and energy storage capabilities of antiferroelectric materials. The behavior of linear and non-linear materials, including both BaTiO3 and PLZT antiferroelectrics, is compared"--Abstract, page iii.

Advisor(s)

Schwartz, Robert W.

Committee Member(s)

Dogan, Fatih
O'Keefe, Matthew

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Publisher

University of Missouri--Rolla

Publication Date

Fall 2004

Pagination

xv, 130 pages

Note about bibliography

Includes bibliographical references (pages 127-129).

Rights

© 2004 Chunhong Zhou, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Dielectric devicesEnergy storage

Thesis Number

T 8702

Print OCLC #

62267651

Electronic OCLC #

1088895277

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