Abstract

PASTENES, Elson S  and  REYES-GASGA, J. COMPUTER SIMULATION OF SELECTED AND CONVERGENT BEAM ELECTRON DIFFRACTION PATTERNS FOR HYDROXYAPATITE. Rev. LatinAm. Met. Mat. [online]. 2001, vol.21, n.2, pp.69-73. ISSN 0255-6952.

In this work, the structural characteristics of the hydroxyapatite (HAP) are studied by simulation of selected area (SAD) and convergent beam (CBED) electron diffraction patterns. Experimentally HAP shows SAD patterns that present an incompatibility with the crystallography of its reported space group, because the existence of forbidden reflections 00l (l odd). Since forbidden reflections along the c* axis are a consequence of the existence of the screw axis of the symmetry 63 according with the simulation results, they indicate that experimentally this screw axis is lost during the sample electron beam interaction.

Keywords : Hydroxyapatite; CBED patterns; simulation of structure; forbidden reflections.