Abstract
Using dispersion-corrected density functional theory (DFT), we investigate the effect of uniaxial compression on 1, 1-diamino-2, 2-dinitroethene (FOX-7) crystal. Principal and shear stresses along the [100], [010], and [001] orientations exhibit considerable anisotropic compressibility. Raman spectra are complemented by DFT calculations in vibrational modes. Several abnormal pressure-induced changes in selected Raman modes are observed along the [100] orientation. Combined Raman peak shifts with inter/intra-molecular hydrogen bonds and N−H/N−O covalent bonds, the results demonstrate that the spectroscopic variation are associated with the rearrangement of hydrogen-bonded networks of FOX-7 crystal. These findings imply a possible phase transformation or some minor changes in molecular conformation in the pressure regions under uniaxial compression.
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