https://doi.org/10.1140/epjb/e2009-00271-7
Crystalline phase transitions and acoustic phonons behaviour of polymorphic ethanol
1
Instituto de Ciencia de Materiales de Madrid (C.S.I.C.), Campus de
Cantoblanco s/n, 28049 Madrid, Spain
2
Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, C-III, Instituto de Ciencia de Materiales “Nicolás
Cabrera”, Universidad Autónoma de Madrid, 28049 Madrid, Spain
Corresponding author: a rjimenez@icmm.csic.es
Received:
12
March
2009
Revised:
8
June
2009
Published online:
11
August
2009
Ethanol shows a complex scenario of different crystalline phases in the temperature range between its glass transition at Tg = 97 K and its melting point at Tm = 159 K. Brillouin spectroscopy has revealed capable of observing and assessing acoustic phonon changes related to these phase transitions between different crystalline phases (either a plastic-crystal phase or different monoclinic phases). By combining this technique and calorimetric experimental data, we are able to corroborate the existence of at least two stable and two metastable (monoclinic) crystalline phases of pure ethanol.
PACS: 78.35.+c – Brillouin and Rayleigh scattering; other light scattering / 87.19.rd – Elastic properties / 64.60.My – Metastable phases / 64.70.kt – Molecular crystals
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
