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High-Pressure Vibrational Spectroscopy of Hexahydro- 1,3,5-Trinitro-1,3,5-Triazine (RDX)

Authors

  • Xianxu Zheng,

    Corresponding author
    1. National Key Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan (China)
    • National Key Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan (China)
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  • Jun Zhao,

    1. National Key Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan (China)
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  • Duowang Tan,

    1. National Key Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan (China)
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  • Cangli Liu,

    1. National Key Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan (China)
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  • Yunfei Song,

    1. Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001 (China)
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  • Yanqiang Yang

    1. Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001 (China)
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Abstract

The molecular-level response of RDX to hydrostatic compression was examined in a diamond anvil cell using Raman spectroscopy. The pressure-induced alterations in spectral profiles of the C[BOND]N stretching mode (886 cm−1) were studied up to 8.3 GPa. At pressures near 4.4 GPa, several changes of the C[BOND]N stretching mode become immediately apparent in Raman spectrum, such as large frequency shifts, line broadening, mode splitting, and intensity changes, which are associated with the αγ phase transition and rearrangement between the RDX molecules. The high pressure Raman spectra changes of the C[BOND]N stretching mode are indicative of an αγ phase transition, and also suggest the lowering of molecular symmetry and crystal symmetry, which are expected to provide some insight into RDX molecular stability and decomposition.

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