Diffuse Neutron Scattering of KBr at Room Temperature and Its Application as Background Function in Rietveld Analysis

Khairul Basar (1Nuclear Physics and Biophysics Research Division – Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia)
Xianglian Xianglian (2Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan)
Takashi Sakuma (2Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan)
Haruyuki Takahashi (3Institute of Applied Beam Science, Ibaraki University, Hitachi 316-8511, Japan)
Naoki Igawa (4Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai 319-1195, Japan)

Journal of Mathematical and Fundamental Sciences
Vol. 41 No. 1 (2009)

Diffuse neutron scattering from powder KBr was measured at room temperature. The oscillatory diffuse scattering is clearly observed. The diffuse scattering theory including correlation effects among thermal displacements of atoms is applied to background function in the Rietveld analysis. The observed scattering data are analyzed by including the correlation effects among thermal displacements of first, second and third nearest neighboring atoms. The inter-atomic distance and temperature dependence of the values of correlation effects is discussed.