Abstract
Neutron scattering measurements have been performed on sodium nitrate at temperatures between 16 and 553 K, using both time-of-flight and triple-axis spectrometers, focusing on the phonon modes with wavevectors between the Brillouin zone centre and the F zone boundary point. At the F point there is a significant softening in energy of a transverse acoustic phonon branch on heating. Unlike the case of the related material calcite, there is no continuum of inelastic scattering localized in reciprocal space about the F point, and with a strong temperature dependence. Instead we find a component of inelastic scattering that is broad in both energy and wavevector, and with only a weak dependence on temperature.
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