High-Pressure Properties of Fluorinated Methanes

Youhong Wu; Hiroyasu Shimizu

doi:10.4131/jshpreview.4.157

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Keywords: fluorinated methanes, Raman scattering, FT-IR, phase transition, molecular crystal, mode-Grüneisen parameter, Fermi resonance, LO-TO splitting, transition dipole-transition dipole interaction, covalent-bond, ionic-bond

JOURNAL FREE ACCESS

1995 Volume 4 Issue 2 Pages 157-162

DOI https://doi.org/10.4131/jshpreview.4.157

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Abstract

It is known that fluorinated methanes CH₃F (HFC-41), CH₂F₂ (HFC-32), CHF₃ (HFC-23), CF₄ (FC-14) and CHF₂Cl (HCFC-22) have considerably more importance to mankind, which have been suggested as the potential replacements for chlorofluorocarbons (CFC_s). This article reviews recent high-pressure Raman studies of CH₃F, CH₂F₂, CHF₃, CF₄ and CHF₂Cl, and high-pressure FT-IR study of CH₂F₂. The pressure-induced phase transitions, the pressure dependence of molecular vibrations, the mode-Grüneisen parameters and the other characteristic behavior of these condensed molecules have been presented and discussed.

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