Masters Theses
Abstract
"The extent of anomalous shrinkage behavior of porous Sr-doped Ianthanum manganite (La1-xSrx)1-y MnO3+δ, or LSM-X, where x = 0.0 to 0.4 and X = x% was studied as a function of Sr concentration, thermal, and oxygen partial pressure (pO2) cycling. The shrinkage or densification of LSM was induced by either thermal cycling between 650⁰C and 1000⁰C at a constant oxygen partial pressure (air), or at a fixed temperature between 650⁰C and 1000⁰C while cycling the pO2 between air and nitrogen (0.2 x 10-5 atm O2). Thermal cycling LSM-10 (x = 0.1) between 800uC and 1000uC resulted in the maxi mum thermal cycling shrinkage rate. Cycling the ambient pO2 of an LSM-10 bar at 900°C resulted in the maximum shrinkage rate with a cycling time of two minutes. Throughout each of the thermal or pO2 cycling tests LSM never attained an oxygen stoichiometry equiIibrium state corresponding to its temperature and pO2. It was postulated that the transition between these non-equiIibrium oxygen nonstoichiometry states was Iinked to the anomalous shrinkage of LSM"--Abstract, page iii.
Advisor(s)
Anderson, H. U. (Harlan U.)
Committee Member(s)
O'Keefe, Matthew
Fahrenholtz, William
Department(s)
Materials Science and Engineering
Degree Name
M.S. in Ceramic Engineering
Sponsor(s)
United States. Office of Fossil Energy
Publisher
University of Missouri--Rolla
Publication Date
Summer 2006
Pagination
xiii, 87 pages
Note about bibliography
Includes bibliographical references (pages 84-86).
Rights
© 2006 Benjamin Philip McCarthy, All rights reserved.
Document Type
Thesis - Restricted Access
File Type
text
Language
English
Subject Headings
Lanthanum compounds
Sintering
Strontium
Thermal stresses
Thesis Number
T 8949
Print OCLC #
84543097
Electronic OCLC #
1088893053
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://merlin.lib.umsystem.edu/record=b5788058~S5Recommended Citation
McCarthy, Benjamin Philip, "Anomalous shrinkage of strontium doped lanthanum manganite" (2006). Masters Theses. 3868.
https://scholarsmine.mst.edu/masters_theses/3868
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