INELASTIC NEUTRON-SCATTERING IN CS5D3(SO4)(4) CRYSTAL

In our report, we present first results of the investigation of the be haviour of acoustic phonons at the phase transformation from the dynam ically to statically disordered network of hydrogen bonds in the Cs5D3 (SO4)(4) . D2O (PCTS) crystal. Neutron scattering experiments at room temperature were performed on a triple axis spectrometer. Dispersion o f the TA phonon along the [00 xi] direction in a hexagonal phase was o bserved. The temperature dependencies of the TA and mixed phonon branc hes along [110] were studied. (C) 1998 Published by Elsevier Science B .V. All rights reserved.