Doctoral Dissertations

Abstract

"The Mössbauer Effect was used to measure the phase transitions in the following ferroelectric compounds: 95% PbZ4₀.₈Ti₀.₂ - 5% BiFeO₃ [and] 95% PbZ4₀.₇Ti₀.₃ - 5% BiFeO₃ and in the antiferroelectric compound: 95% PbZrO₃ - 5% BiFeO₃. The parameters obtained were the area under the resonance peak, the isomer shift, and the electric quadrupole splitting, all as a function of temperature. The ionicity, electric field gradient, and Debye temperature were determined for room temperature. The data are discussed in terms of the lattice vibration model of ferroelectrics and antiferroelectrics, and the structural phase transitions as recently defined for these compounds. The ionicity is determined and discussed in relation to crystal distortion and Curie temperature. The electric field gradient is related to the relative polarizations of the different samples. A discussion of the mixture of charge states on the A and B ion sites of the perovskite structure, and the oxygen defect problem in these compounds, completes the discussion"--Abstract, page i.

Advisor(s)

Gerson, Robert, 1923-2013

Committee Member(s)

Park, John T.
Wesley, James Paul
Danner, Horace R.
Tefft, Wayne E., 1929-1973
James, William Joseph

Department(s)

Physics

Degree Name

Ph. D. in Physics

Sponsor(s)

U.S. Atomic Energy Commission
United States. National Aeronautics and Space Administration

Publisher

University of Missouri--Rolla

Publication Date

1969

Pagination

viii, 170 pages

Note about bibliography

Includes bibliographical references (pages 115-124).

Rights

© 1969 James Philip Canner, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Ferroelectric crystals
Mössbauer effect
Antiferromagnetism
Perovskite

Thesis Number

T 2282

Print OCLC #

6012091

Electronic OCLC #

833159803

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