Anomalies in the scattering of gamma-rays from single crystals of HF-doped ice-I h around 100 K

Using the high energy resolution of the Mössbauer effect, the elastic and inelastic scattering of gamma-rays from single crystals of HF-doped IceI_h has been distinguished. The crystals were studied in the region of 100 K, since measurements by previous workers have suggested the possibility of an order-disorder transition at this temperature. Marked anomalies in the scattered intensity were observed between 106 and 125 K, and these were shown to depend on the thermal history of the crystals.