Inter-atomic force constants of BaF by diffuse neutron scattering measurement

Sakuma, Takashi*; Makhsun*; Sakai, Ryutaro*; Xianglian*; Takahashi, Haruyuki*; Basar, K.*; Igawa, Naoki; Danilkin, S. A.*

AIP Conference Proceedings 1656, p.020002_1 - 020002_4, 2015/04

https://doi.org/10.1063/1.4917089

Diffuse neutron scattering measurement on BaF crystals was performed at 10 K and 295 K. Oscillatory form in the diffuse scattering intensity of BaF 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. From the values of correlation effects and Debye-Waller temperature parameters, force constants among the first and second nearest neighboring atoms of BaF, were determined to be 4.40 and 2.30 eV/ at 295 K, respectively