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Characterization of Un-stabilized Orthorhombic Zirconia Synthesized at Ambient Temperature and Pressure

Published online by Cambridge University Press:  11 January 2012

Miriam P. Trubelja ,
Donald Potter ,
Claudia Rawn ,
Karren More  and
Joseph J. Helble
Miriam P. Trubelja
Affiliation:
Department of Chemical Engineering, University of Connecticut, Storrs, CT 06269-3136
Donald Potter
Affiliation:
Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269-3136
Claudia Rawn
Affiliation:
High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6062
Karren More
Affiliation:
High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6062
Joseph J. Helble
Affiliation:
Thayer School of Engineering at Dartmouth, 8000 Cummings Hall, Hanover, NH 03755-8000
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Abstract

Bulk structures of un-stabilized ZrO2-x with x in the 0 ≤ x ≤ 0.44 range under ambient pressure exist in three different structures (monoclinic, tetragonal and cubic). At ambient temperature and elevated pressures above 3.5 GPa, zirconia, at these compositions, a fourth phase is found, the orthorhombic structure. A dilute sol-gel method was used to produce nanoscale zirconia particles containing the unstabilized orthorhombic cotunnite structure for use in this project. Extensive characterization of this material indicates that the critical factor in determining the synthesized structures appears to be the number and placement of oxygen vacancies. These results also indicate that surface energy alone is not the controlling factor in determining the crystal structure synthesized.

Keywords

infrared (IR) spectroscopycrystallographic structuretransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1406: Symposium Z – Functional Metal-Oxide Nanostructures , 2012 , mrsf11-1406-z05-06
Copyright
Copyright © Materials Research Society 2012

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