Measurement of Crystal Symmetry using HARECXS

Abstract

Convergent Beam Electron Diffraction (CBED) has long been used to measure the symmetry of crystalline materials because of its sensitivity to changes in structure. By quantitative comparison of calculated CBED patterns with experimental data it is possible to determine crystal symmetry and atomic site occupation. In a similar manner, electron channeling induced x-ray emission can be used to study crystal site occupancy. In this work we have used high angular resolution of electron channeling x-ray spectroscopy (HARECXS) in a zone axis orientation to demonstrate that crystal symmetry can be directly observed as a compliment to the CBED technique.