A systematic method to identify the space group from PED and CBED patterns part II - practical examples

摘要

Precession Electron Diffraction and Convergent-Beam Electron Diffraction are used in a complementary way to determine the space group of three known structures following the general method described in the first part of this paper. The selected structures concern a monoclinic example (coesite SiO_2 with space group C2/c) and two cubic examples (γ-Al_4Cu_9 with space group P43m and pyrite FeS_2 with space group Pa3). For each case, a minimum number of zone axis patterns are used to determine the space group without ambiguity, which illustrates the simplicity and reliability of the method.