The Strain-Driven Pyrochlore to “Defect Fluorite” Phase Transition in Rare Earth Sesquioxide Stabilized Cubic Zirconias
✍ Scribed by Y. Tabira; R.L. Withers; J.C. Barry; L. Elcoro
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 679 KB
- Volume
- 159
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The relationship between the ordering characteristic of the pyrochlore structure type and that characteristic of the 99defect 6uorite:: structure type (immediately on either side of two phase regions separating the two structure types) in a range of rare eath sesquioxide stabilized cubic zirconias is investigated via electron di4raction and imaging. Systematic structural change as a function of composition and relative size of the constituent metal ions is highlighted and a multi-q to single-q ؍ 1/2 [111]* model proposed for the observed pyrochlore to defect 6uorite phase transition. Strain introduced into the close-packed {111} metal ion planes of the defect 6uorite average structure by the local cation and oxygen vacancy distribution is pointed to as the likely origin of the observed behavior.