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Pressure‐Induced Phase Transformation of HfO 2
Author(s) -
Arashi Haruo
Publication year - 1992
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.1151-2916.1992.tb04149.x
Subject(s) - raman spectroscopy , monoclinic crystal system , phase (matter) , materials science , crystal structure , analytical chemistry (journal) , polarization (electrochemistry) , crystallography , chemistry , optics , physics , organic chemistry , chromatography
The pressure dependence of the Raman spectra of HfO 2 was measured by a micro‐Raman technique using a singlecrystal specimen in the pressure range from 0 to 10 GPa at room temperature. The symmetry assignment of Raman bands of the monoclinic phase was experimentally accomplished from the polarization measurements for the single crystal. With increased pressure, a phase transformation for the monoclinic phase took place at 4.3 ± 0.3 GPa. Nineteen Raman bands were observed for the high‐pressure phase. The spectral structure of the Raman bands for the high‐pressure phase was similar with those reported previously for ZrO 2 . The space group for the high‐pressure phase of HfO 2 was determined as Pbcm , which was the same as that of the high‐pressure phase for ZrO 2 on the basis of the number and the spectral structure of the Raman bands.