Doctoral Dissertations

Abstract

"High temperature electrical conductivity, Seebeck coefficient, and thermogravimetric measurements were made as a function of oxygen activity to investigate the electrical transport behavior and defect structure of Ca-doped YCrO3. Defect models were developed to correlate the electrical conductivity and thermogravimetric data by relating the concentration of charge carriers to the acceptor dopant and oxygen vacancy concentrations. These relations were found to adequately explain the experimental data. Thermodynamic properties were calculated which were consistent with the model. Calculations of the carrier concentrations, the activation energies, and the mobilities were also performed. The analysis of the electrical conductivity, Seebeck and mobility data suggested that the conduction process in Ca-doped YCrO3 occurs via the small polaron hopping mechanism. Kroger-Vink diagrams showing the regions of stability with respect to oxygen activity and temperature were constructed"--Abstract, page iii.

Advisor(s)

Anderson, H. U. (Harlan U.)

Committee Member(s)

Sparlin, Don M.
Moore, Robert E., 1930-2003
Leighly, Hollis P., 1923-2004
Rahaman, M. N., 1950-

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Sponsor(s)

United States. Department of Energy

Publisher

University of Missouri--Rolla

Publication Date

Fall 1990

Pagination

xi, 100 pages

Note about bibliography

Includes bibliographical references (pages 93-99).

Rights

© 1990 George Francis Carini, II, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Library of Congress Subject Headings

Electric conductivity -- Measurement
Thermoelectric materials
Thermal conductivity

Thesis Number

T 6114

Print OCLC #

24114620

Electronic OCLC #

905014553

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

http://laurel.lso.missouri.edu/record=b2322563~S5

Share

 
COinS