Inter atomic force constants of -PbF from diffuse neutron scattering measurement

Xianglian*; Bao, W.*; Guo, T.*; Li, P.*; Sakuma, Takashi*; Igawa, Naoki

International Journal of Innovation in Science and Mathematics, 5(6), p.165 - 167, 2017/11

Diffuse neutron scattering measurements were performed on powder -PbF at 633 K. Oscillatory diffuse scattering intensities were observed and the observed diffuse scattering intensities were explained by including the correlation effects among thermal displacements of atoms. The force constants among first- and second-nearest-neighboring atoms in -PbF calculated from the values of correlation effects and Debye-Waller temperature parameters were determined as 0.36 eV/ at = 2.599 and 0.21 eV/ at = 3.001 AA, respectively.