Characterization of the cotunnite-type phases of zirconia and hafnia by neutron diffraction and Raman spectroscopy

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb03073.x· OSTI ID:529550

Haines, J; Leger, J M ^[1]; Hull, S ^[2]; Petitet, J P ^[3]; Pereira, A S; Perottoni, C A; Jornada, J A.H. da ^[4]

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1. C.N.R.S., Meudon (France). Lab. de Physico-Chimie des Materiaux
2. Rutherford Appleton Lab., Chilton (United Kingdom). ISIS facility
3. C.N.R.S., Villetaneuse (France). Lab. d`Ingenierie des Materiaux et des Hautes Pressions
4. UFRGS, Porto Alegre, Rio Grande do Sul (Brazil)

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) {angstrom} in ZrO{sub 2} and from 2.121(1) to 2.535(2) {angstrom} in HfO{sub 2}. The Raman spectra of both phases resemble one another strongly and are consistent with the cotunnite-type structure. These results confirm that ZrO{sub 2} and HfO{sub 2} undergo transitions to the same phase at high pressure.

• Sponsoring Organization: USDOE
• OSTI ID: 529550
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
HAFNIUM OXIDES
LATTICE PARAMETERS
NEUTRON DIFFRACTION
PRESSURE DEPENDENCE
RAMAN SPECTROSCOPY
TEMPERATURE DEPENDENCE
ZIRCONIUM OXIDES