Abstract
Pressure-dependent Raman scattering studies have been performed on
stearic acid single crystal, C form. The vibrational spectra have been
recorded in the 20-1200cm(-1) and in the 2800-3100cm(-1) spectral
regions. The behavior of the Raman modes indicates that the crystal
undergoes a series of structural modifications. The change observed
between 0.8 and 1.27 GPa was associated with a conformational
modification or tilting of the dimer. A second modification was observed
at similar to 2.5 GPa accompanied by jump of lattice mode frequencies,
and the appearance and disappearance of bands. Finally, a third set of
changes in the Raman band profile was observed between 3.3 and 3.8 GPa
and was associated with another structural phase transition. (C) 2010
Elsevier B.V. All rights reserved.
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