Static and shock compression of RDX single crystals: Raman spectroscopy
2008; IOP Publishing; Volume: 121; Issue: 4 Linguagem: Inglês
10.1088/1742-6596/121/4/042012
ISSN1742-6596
AutoresZbigniew A. Dreger, Jennifer Patterson, Y. M. Gupta,
Tópico(s)Crystallography and molecular interactions
ResumoWe report an examination of the polymorphic α - γ transformation for the energetic crystal RDX under static and shock compression. Raman spectroscopy was utilized as a probe of the molecular level response. We observed splitting of several Raman modes with the occurrence of the phase transition. From the response of the lattice and internal modes to static compression, we propose that the γ phase structure is isomorphous with the D2h point group with eight molecules per unit cell occupying C1 symmetry sites. The phase transition was observed to occur under shock wave loading with a transition time of ∼100 ns for a peak stress of 5.5 GPa. The occurrence of the phase transition under shock wave loading has important implications for the onset of chemical decomposition in RDX.
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