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Diffuse Neutron Scattering of KBr at Room Temperature and Its Application as Background Function in Rietveld Analysis
1,*Khairul Basar, 2Xianglian, 2Takashi Sakuma, 3Haruyuki Takahashi & 4Naoki Igawa
1Nuclear Physics and Biophysics Research Division – Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia
2Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan
3Institute of Applied Beam Science, Ibaraki University, Hitachi 316-8511, Japan 4Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai 319-1195, Japan
Abstract. 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.
Keywords: neutron scattering, diffuse scattering, correlation effects, thermal displacements, Rietveld analysis
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