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- W2022258879 abstract "Infrared and Raman spectra of Fe(OH){sub 2}, ''white rust'', were measured between 7 GPa and 21 GPa at ambient temperature. The frequency of the infrared-active A{sub 2u} and of the Raman-active A1g stretching modes of the O-H group decrease linearly with pressure with slopes of -1.3 {+-} 0.1 cm{sup -1}/GPa and -4.9 {+-} 0.2 cm{sup -1}/GPa, respectively. The peak widths of both the infrared-active and Raman-active modes increase non-linearly with pressure, with a discontinuous increase of in broadening between 10 and 12.5 GPa. The overall broadening of the A{sub 2u} and of the A{sub 1g} stretching modes is approximately four-fold in the examined pressure range. The results of this spectroscopic study are compatible with the trends observed in recent neutron diffraction studies in the isostructural Co(OH){sub 2}. Progressive pressure-induced H disordering could be a viable model to interpret both the broadening of the OH stretching mode and the changes in oxidation state of Fe recently observed by Moessbauer spectroscopy." @default.
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- W2022258879 date "2004-11-09" @default.
- W2022258879 modified "2023-09-24" @default.
- W2022258879 title "Vibrational Spectroscopy of Fe(OH)2 at High Pressure: Behavior of the O-H Bond" @default.
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