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Abstract
A simultaneous neutron diffraction and neutron inelastic scattering experiment on sodium ammonium sulphate dihydrate has been carried out in the temperature range 300 to 20 K. The neutron powder diffraction (NPD) spectra correlate with those found previously using X-ray diffraction dilatometry. The IINS spectra are reported for the first time. For the temperature range from 160 to 200 K, they indicate the existence of a glassy transition or an instability caused by soft optic modes. The generalized phonon density of states G(ω) is also discussed. The observed bands are ascribed to particular vibrational modes of the crystal as a whole and of NH4+, SO42— and H2O groups.
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