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Raman studies of hexagonal MoO 3 at high pressure
Author(s) -
Zhang C. C.,
Zheng L.,
Zhang Z. M.,
Dai R. C.,
Wang Z. P.,
Zhang J. W.,
Ding Z. J.
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000633
Subject(s) - raman spectroscopy , materials science , hydrothermal circulation , raman scattering , electrochromism , amorphous solid , phase transition , diamond anvil cell , transition metal , ambient pressure , phase (matter) , hexagonal phase , diamond , analytical chemistry (journal) , electrode , nanotechnology , hexagonal crystal system , crystallography , chemistry , catalysis , optics , chemical engineering , condensed matter physics , diffraction , composite material , engineering , biochemistry , chromatography , thermodynamics , physics , organic chemistry
Abstract The transition‐metal oxide MoO 3 is an important semiconductor and has various technological applications in catalysts, electrochromic and photochromic devices, gas sensors, and battery electrodes. In this study, the hexagonal MoO 3 prepared by a hydrothermal method is in morphology of microrod with diameter of 0.8–1.2 µm and length of 2.0–4.3 µm. Its structural stability was investigated by an in situ Raman scattering method in a diamond anvil cell up to 28.7 GPa at room temperature. The new Raman peak around 1000 cm −1 implies that a phase transition from hexagonal to amorphous starts at 5.6 GPa, and the evolution of the Raman spectra indicates that the structural transition is completed at about 13.2 GPa. After releasing pressure to ambient condition, the Raman spectrum pattern of the high pressure phase was retained, revealing that the phase transition is irreversible.