Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 74, Issue -, Pages S549-S551Publisher
SPRINGER-VERLAG
DOI: 10.1007/s003390201628
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Variation of pressure and temperature in inelastic neutron scattering experiments allows us to separate density and thermal energy contributions. We summarise briefly the influence of pressure and temperature on the dynamic scattering law of the polymer glass former poly(butadiene) far below the glass transition. We also show the advantage of using a liquid-niobium pressure cell in such studies. The effect of pressure on the boson peak is to shift the peak towards higher energies and to reduce the low-frequency modes more strongly below the boson-peak maximum than above. A decrease in the Debye-Waller factor with increasing pressure is observed.
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