Doctoral Dissertations

Abstract

"The magnetic susceptibility and spontaneous magnetic moment of the perovskitic, polycrystalline solid solutions of BiFeO3 with PbTiO3, PbZrO3, and [50PbZrO3·50PbTiO3] were determined using the Faraday method. Pure BiFeO3 has a G-type antiferromagnetic structure. Although the perovskite BiFeO3 exhibits a sharp peak in the susceptibility at the Néel temperature, it does not possess a spontaneous magnetic moment. The solid solutions investigated possessed a spontaneous magnetic moment throughout the multiple cell rhombohedral region of the BiFeO3-PbTiO3-PbZrO3 ternary phase diagram, which extends from pure BiFeO3 to 75 to 80 percent BiFeO3 content on both sides and extends to nearly 50 percent BiFeO3 content in the center region. Except for some anomalous cases in the BiFeO3-PbTiO3 system, no spontaneous magnetic moments were observed outside the multiple cell rhombohedral region. Extrapolated values for the spontaneous moment for pure BiFeO3 ranged from 0.03 to 0.06 G cm3/g. For compositions containing from 10 to 60 percent BiFeO3, the susceptibility varied inversely with T+θ where T is the absolute temperature and θ is a positive constant. Thus, antiferromagnetic ordering was evident throughout the composition range.

Although BiFeO3 has been proposed as a material in which the electric and magnetic properties interact, no evidence was found to support this assertion"--Abstract, pages i-ii.

Advisor(s)

Gerson, Robert, 1923-2013

Committee Member(s)

James, William Joseph
Lund, Louis H., 1919-1998
Johnson, Charles A.
McFarland, Charles E.

Department(s)

Physics

Degree Name

Ph. D. in Physics

Sponsor(s)

U. S. Atomic Energy Commission

Publisher

University of Missouri at Rolla

Publication Date

1967

Pagination

xiii, 224 pages

Note about bibliography

Includes bibliographical references (pages 205-215).

Rights

© 1967 James Ivan Latham, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Ferroelectric crystals -- Magnetic propertiesSolids -- Magnetic propertiesCrystals -- Magnetic propertiesAntiferromagnetismPerovskite

Thesis Number

T 1979

Print OCLC #

5981187

Electronic OCLC #

910243481

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