Crystalline Microstructure of Corundum Fillers Determined from Powder X-Ray Diffraction Patterns

M.A. Kojdecki a, J. Bastida b, F.J. De la Torre c, P. Pardo d, R. Ibáńez e, and M.M. Urquiola f aInstitute of Mathematics and Cryptology, Military University of Technology, 00-908 Warsaw, Poland bDepartment of Geology, University of Valencia, 46100 Burjasot, Valencia, Spain cDepartment of Chemical Engineering, University of Valencia, 46100 Burjasot, Spain dDepartment of Inorganic Chemistry, University of Valencia, 46100 Burjasot, Spain eInstitute of Materials Science, University of Valencia, 46980 Paterna, Valencia, Spain fCeinmat S.L, Scientific Park of the University of Valencia, 46980 Paterna, Spain

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X-ray-diffraction microstructural analysis was performed for corundum powders produced from Bayer aluminium hydroxides in different ways and for high purity corundum powders produced from other raw materials. Crystalline microstructure characterised by prevalent crystallite shape, volume-weighted crystallite size distribution and second-order crystalline lattice strain distribution was determined through modelling crystallite shapes as hexagonal prisms, with the resulting mean volume-weighted standardised crystallite size in the range 406-1941 Å, height-to-base-diagonal ratio in the range 0.68-0.94 and the mean-absolute second-order strain in the range 0.028-0.087%. Crystallite size distributions were found to be well approximated as bimodal logarithmic-normal ones and consequently four types of microstructure were recognized as depending on precursors and methods of production.

DOI: 10.12693/APhysPolA.130.1000 PACS numbers: 81.05.Je, 61.72.Dd