Masters Theses

Pen-chu Chou

Abstract

"The lead zirconate-bismuth ferrate system was studied employing x-ray and microscopic analysis. Samples were prepared by sintering stoichiometric mixtures of the corresponding oxides followed by air quenching. The results of the analyses show the system to be probably solid solutions over the entire compositional range, although small amounts of other phases are present in some regions.

X-ray data indicate a multiple cell, orthorhombic phase, to exist over the range 100-30 mole percent PbZrO₃ . From 100-82 mole percent PbZrO₃ , the addition of BiFeO₃ reduces the distortion of the phase such that a nearly cubic x-ray pattern is obtained at approximately 80 mole percent PbZrO₃. In the same range dielectric measurements suggest antiferroelectric properties. The nearly cubic phase is also confirmed by a minimum in a plot of Curie points versus composition.

From 80-30 mole percent PbZrO₃ the structure is only slightly distoxted from that at 80 mole percent PbZrO₃ . In the range 80-50 mole percent PbZrO₃, the system is apparently ferroelectric. Samples of composition greater than 50 mole percent BiFeO₃ are too conductive for meaningful dielectric measurements.

A rhombohedral phase corresponding to that of pure BiFeO₃ is observed from approximately 75-100 mole percent BiFeO₃.

The electrical properties of the solid solutions in the range from 100-50 mole percent PbZrO₃ are explained on the basis of a structural model of crystalline PbZrO₃ proposed by previous investigators"--Abstract, pages ii-iii.

Advisor(s)

James, William Joseph

Committee Member(s)

Gerson, Robert, 1923-2013
Lorey, G. Edwin
Tappmeyer, Wilbur P.

Department(s)

Chemistry

Degree Name

M.S. in Chemistry

Sponsor(s)

U.S. Atomic Energy Commission

Publisher

University of Missouri at Rolla

Publication Date

1965

Pagination

xi, 101 pages

Note about bibliography

Includes bibliographical references (pages 74-77)

Rights

© 1965 Pen-chu Chou, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

FerroelectricityPerovskiteSolutions, Solid

Thesis Number

T 1832

Print OCLC #

5972629

Electronic OCLC #

895196314

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