Diffuse neutron scattering measurement on BaF2 crystals was performed at 10 K and 295 K. Oscillatory form in the diffuse scattering intensity of BaF2 was observed at 295 K. The correlation effects among thermal displacements of F-F atoms were obtained from the analysis of oscillatory diffuse scattering intensity. The force constants among neighboring atoms in BaF2 were determined and compared to those in ionic crystals and semiconductors.

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