A Raman Spectroscopic Study of Nitromethane up to 350 °C and 35 GPa

S. Courtecuisse (1) , François Cansell (2, 3, 4) , D. Fabre (2) , J.-P. Petitet (2)

1 Centre d'Etudes de Vaujours-Moronvilliers
2 LIMHP - Laboratoire d'Ingénierie des Matériaux et des Hautes Pressions
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
4 Laboratoire de Chimie du Solide

Nitromethane has been studied as a model of the energetic nitro materials. The liquid - transition line has been established by Piermarini [1] and a first solid - solid transition corresponding to the methyl group rotation locking has been evidenced by Cromer [2]. In order to precise the phase diagram of nitromethane, a study has been performed by Raman scattering in the pressure and temperature range of 0 -35 GPa and 20 - 350°C respectively. From these experimental results three new solid phases of nitromethane called III, IV, V and their stability domain have been located. A first chemical transformation line has been detected by the disappearance of nitromethane Raman modes and by the irreversible formation of a transparent solid (CI). A second chemical transformation (CI - CII), at higher temperature, is observed by the sudden darkening of the sample.

Mots clés: Nitromethane; Raman spectroscopy; High pressure

Domaines: Articles anciens

S. Courtecuisse, François Cansell, D. Fabre, J.-P. Petitet. A Raman Spectroscopic Study of Nitromethane up to 350 °C and 35 GPa. Journal de Physique IV Proceedings, 1995, 5 (C4), pp.359-363. ⟨10.1051/jp4:1995428⟩. ⟨jpa-00253733⟩