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Assessment of preferred orientation with neutron powder diffraction data
Author(s) -
Sitepu H.
Publication year - 2002
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889801021537
Subject(s) - powder diffractometer , crystallite , materials science , neutron diffraction , texture (cosmology) , powder diffraction , orientation (vector space) , rietveld refinement , crystallography , diffractometer , neutron , diffraction , calcite , nist , resolution (logic) , analytical chemistry (journal) , mineralogy , optics , crystal structure , chemistry , geometry , physics , mathematics , chromatography , computer science , nuclear physics , artificial intelligence , natural language processing , image (mathematics)
Crystallographic texture (or preferred orientation) characterization of uniaxially pressed molybdite (MoO 3 ) and calcite (CaCO 3 ) powders has been carried out using the BT‐1 high‐resolution fixed‐wavelength 32‐detector powder diffractometer at the NIST Center for Neutron Research. Initially, each pattern was analysed assuming a random orientation of the crystallites. Subsequently, the March model and the generalized spherical harmonic description were used independently to extract the texture description directly from a refinement with neutron diffraction data of molybdite and calcite. The results indicate that the generalized spherical harmonic description provided a better Rietveld fit than the March model for the molybdite sample that had been subjected to the highest pressure.