Abstract
Indomethacin (IMC) is a medicine available in various countries worldwide. The longitudinal acoustic (LA) and transverse acoustic (TA) modes of liquid, glass, and γ-form crystalline IMC were studied by Brillouin scattering spectroscopy on the basis of the backward scattering and reflection-induced ΘA scattering geometies. Upon heating of glassy IMC, the elastic anomaly at the liquid–glass transition temperature Tg = 315 K was clearly observed. With further heating of the supercooled liquid state, crystallization and melting into an equilibrium liquid phase were also observed. The temperature dependence of the elastic constants of a γ-form IMC crystal was determined using the observed velocities of an LA and two TA modes below the melting temperature Tm = 433 K.
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