Neutron Diffraction Studies of CsSCN above Room Temperature

Abstract

Neutron diffraction studies have been made on the orthorhombic phase of caesium thiocyanate for temperatures below the order-disorder phase transition at 470 K. The structure, as determined at 453 K by elastic neutron diffraction, is found to be very similar to that at room temperature. This behaviour is contrasted with that of potassium thiocyanate. The temperature dependences of the acoustic phonon dispersion branches, as determined by inelastic neutron diffraction, are also presented for temperatures up to 463 K. No evidenq: of significant mode softening was observed.