Bibliographic Citation
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Title | Crystal structure and equation of state of cotunnite-type zirconia |
Creator/Author | Haines, J. ; Leger, J.M. ; Atouf, A. [C.N.R.S., Meudon (France). Lab. de Physico-Chimie des Materiaux] |
Publication Date | 1995 Feb 01 |
OSTI Identifier | OSTI ID: 79814 |
Other Number(s) | JACTAW; ISSN 0002-7820 |
Resource Type | Journal Article |
Resource Relation | Journal of the American Ceramic Society ; VOL. 78 ; ISSUE: 2 ; PBD: Feb 1995 |
Subject | 36 MATERIALS SCIENCE ; ZIRCONIUM OXIDES; CRYSTAL STRUCTURE; EQUATIONS OF STATE; X-RAY DIFFRACTION; POWDERS; LASERS; PRESSURE DEPENDENCE; TEMPERATURE DEPENDENCE; COMPRESSIBILITY |
Description/Abstract | Cotunnite-type zirconia was studied by angular-dispersive X-ray diffraction in a diamond anvil cell after laser heating and 18 and 26.7 GPa. The structure, space group Pnam, Z= 4, was refined in situ at several different pressures on decompression and at ambient using the Rietveld method. The nine polyhedral Zr-O distances range from 2.10 to 2.56{angstrom} at ambient pressure, which represents both an increase in the average and the minimum Zr-O distance relative to the monoclinic and orthorhombic lower-pressure forms. In addition, data obtained on an unheated sample indicate that the irreversible transition to the cotunnite phase began above 25 GPa and 70% conversion was achieved by 48.5 GPa. The compressibility of cotunnite-type zirconia was found to be slightly anisotropic and a Birch-Murnaghan equation-of-state fit of the p-V data yielded a bulk modulus of 332(8) GPa with a first derivative of 2.3(4), which is in good agreement with the value predicted by previous ab initio calculations. |
Country of Publication | United States |
Language | English |
Format | pp. 445-448 ; PL: |
System Entry Date | 2001 May 03 |
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