Abstract
Only a few topics have been chosen to show the state of the art in inelastic neutron scattering concerned with structural excitations and phase transformations. Experimental and theoretical work on phonon dispersion curves in quartz and sapphire are presented and an eigenvector determination in Si. Longitudinal acoustic excitations along the biological molecule DNA have been observed. A remark on line shapes due to anharmonicity is followed by results on vanishing damping in the superconducting state of Nb. A series of phase transformations in La 2- x Ba x CuO 4 can be analyzed by molecular field theory. Corresponding soft modes can be identified in the structurally similar but insulating compound Pr 2NiO 4. Martensitic phase transformations have been studied in the shape memory material Ni 62.5Al 37.5 and in Ti, Zr and Hf, where the transition goes from BCC to HCP.
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