Characterization of the Cotunnite-Type Phases of Zirconia and Hafnia by Neutron Diffraction and Raman Spectroscopy

The crystal structures of the cotunnite‐type phases (space group, Pnam, Z= 4) of pure zirconia and hafnia prepared under high‐temperature, high‐pressure conditions in a multianvil device were refined by time‐of‐flight neutron powder diffraction. The structures of both compounds are very similar and...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1997-07, Vol.80 (7), p.1910-1914
Main Authors: Haines, Julian, Léger, Jean Michel, Hull, Steve, Petitet, Jean Pierre, Pereira, Altair S., Perottoni, Claudio A., da Jornada, Joäo A. H.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Inorganic compounds
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Water, oxides, hydroxides, peroxides
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Summary:The crystal structures of the cotunnite‐type phases (space group, Pnam, Z= 4) of pure zirconia and hafnia prepared under high‐temperature, high‐pressure conditions in a multianvil device were refined by time‐of‐flight neutron powder diffraction. The structures of both compounds are very similar and the nine polyhedral metal‐oxygen distances range from 2.133(1) to 2.546(1) Å in ZrO2 and from 2.121(1) to 2.535(2) Å in HfO2. The Raman spectra of both phases resemble one another strongly and are consistent with the cotunnite‐type structure. These results confirm that ZrO2 and HfO2 undergo transitions to the same phase at high pressure.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1997.tb03073.x