Splitting of libration mode frequencies in the vicinity of orientation phase transition in NH4Br

Vibrational spectra of NH 4 Br at high pressures up to 4·5GPa have been studied by means of incoherent inelastic neutron scattering using sapphire anvil high pressure cell technique. Libration mode splitting was investigated in the vicinity of the orientation phase transition (P tr = 2·7 GPa) and th...

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Bibliographic Details
Published in:High pressure research 2000-01, Vol.17 (3-6), p.289-295
Main Authors: Glazkov, V. P., Somenkov, V. A., Syrykh, G. F., Savenko, B. N.
Format: Article
Language:English
Subjects:
Ammonium bromide
High pressure
Libration mode
Neutron
Online Access:Get full text
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Summary:Vibrational spectra of NH 4 Br at high pressures up to 4·5GPa have been studied by means of incoherent inelastic neutron scattering using sapphire anvil high pressure cell technique. Libration mode splitting was investigated in the vicinity of the orientation phase transition (P tr = 2·7 GPa) and this effect disappears if pressure is less or higher than P tr . This effect is explained in terms of two-well asymmetric potential.
ISSN:0895-7959
1477-2299
DOI:10.1080/08957950008245917