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Characterization of the Cotunnite‐Type Phases of Zirconia and Hafnia by Neutron Diffraction and Raman Spectroscopy
Author(s) -
Haines Julian,
Léger Jean Michel,
Hull Steve,
Petitet Jean Pierre,
Pereira Altair S.,
Perottoni Claudio A.,
Jornada Joäo A. H.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03073.x
Subject(s) - hafnia , raman spectroscopy , neutron diffraction , cubic zirconia , crystallography , materials science , powder diffraction , crystal structure , diffraction , x ray crystallography , analytical chemistry (journal) , chemistry , ceramic , optics , metallurgy , physics , chromatography
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 ZrO 2 and from 2.121(1) to 2.535(2) Å in HfO 2 . The Raman spectra of both phases resemble one another strongly and are consistent with the cotunnite‐type structure. These results confirm that ZrO 2 and HfO 2 undergo transitions to the same phase at high pressure.