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Identification of tetragonal and cubic structures of zirconia using synchrotron x-radiation source

Published online by Cambridge University Press:  31 January 2011

Ram Srinivasan ,
Robert J. De Angelis ,
Gene Ice  and
Burtron H. Davis
Ram Srinivasan
Affiliation:
Center for Applied Energy Research, University of Kentucky, 3572 Iron Works Pike, Lexington, Kentucky 40511–8433
Robert J. De Angelis
Affiliation:
Department of Mechanical Engineering, 255 Walter Scott Engineering Center, University of Nebraska at Lincoln, Lincoln, Nebraska 68688–0525
Gene Ice
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Burtron H. Davis
Affiliation:
Center for Applied Energy Research, University of Kentucky, 3572 Iron Works Pike, Lexington, Kentucky 40511–8433
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Abstract

X-ray diffraction from a synchrotron source was employed in an attempt to identify the crystal structures in zirconia ceramics produced by the sol-gel method. The particles of chemically precipitated zirconia, after calcination below 600 °C, are very fine, and have a diffracting particle size in the range of 7–15 nm. As the tetragonal and cubic structures of zirconia have similar lattice parameters, it is difficult to distinguish between the two. The tetragonal structure can be identified only by the characteristic splittings of the Bragg profiles from the “c” index planes. However, these split Bragg peaks from the tetragonal phase in zirconia overlap with one another due to particle size broadening. In order to distinguish between the tetragonal and cubic structures of zirconia, three samples were studied using synchrotron radiation source. The results indicated that a sample containing 13 mol% yttria-stabilized zirconia possessed the cubic structure with a0 = 0.51420 ± 0.00012 nm. A sample containing 6.5 mol% yttria stabilized zirconia was found to consist of a cubic phase with a0 = 0.51430 ± 0.00008 nm. Finally, a sample which was precipitated from a pH 13.5 solution was observed to have the tetragonal structure with a0 = 0.51441 ± 0.00085 nm and c0 = 0.51902 ± 0.00086.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 6 , June 1991 , pp. 1287 - 1292
Copyright
Copyright © Materials Research Society 1991

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