STRUCTURE DETERMINATION BY CONVERGENT BEAM ELECTRON-DIFFRACTION

An application of large angle convergent beam electron diffraction (LACBED) is described where a set of kinematic intensities is used to construct Patterson transforms leading to a choice of trial structure for refinement. The validity of this technique has been tested in the determination of the structure for a previously unreported metastable phase in the Al-Ge system that was found to have the C16 structure with a = 5.25 angstrom, c = 6.0 angstrom and almost-equal-to 0.16.