Highly repulsive interaction in novel inclusion D2-N2 compound at high pressure: Raman and x-ray evidence

We present spectral and structural evidences for the formation of a homogeneous cubic delta-N-2-like, noncrystalline solid and an incommensuratelike hexagonal (P6(3)22) inclusion compound (N-2)(12)D-2, formed by compressing a nitrogen-rich mixture to 5.5 and 10 GPa, respectively. A strong repulsive coupling in (N-2)(12)D-2 is evident from a blue shift, discontinuous changes, and the absence of turnover of the D-2 vibron to 70 GPa-all in sharp contrast to both pure D-2 and other inclusion compounds. This repulsive interaction is responsible to the observed incommensuratelike structure and large internal pressure. (C) 2011 American Institute of Physics. [doi:10.1063/1.3533957]