Abstract

We have studied by incoherent quasi-elastic neutron scattering the behavior of the diffusion constant and the molecular movements in the second-stage of nitric acid intercalated in graphite near the melting transition. The transition is continuous and the high temperature phase is a lattice liquid. The diffusion constant follows the critical behavior predicted in a defect mediated phase transition. However, the X-ray diffraction pattern is closer to that of a lattice liquid than that of a hexatic phase.

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