Diffuse Streak Diffraction Patterns from Single Crystals I. General Discussion and Aspects of Electron Diffraction Diffuse Streak Patterns

Abstract

Diffuse streak patterns from single crystals which have become to be noticed very recently in electron diffraction are identified with the “non-radial” streak patterns in X-ray diffraction and their description in terms of parallel wall distribution of intensity weight along low index reciprocal net planes is discussed. Evidences for the description in electron diffraction patterns from silicon, germanium, aluminium. gold, iron, sodium and potassium chlorides and barium titanate are illustrated. An assumption of linear chain scatterers consisting of a small number of nearest neighbour atoms shifted from their regular positions is shown to be able to reproduce the characteristic features of the streak patterns from diamond structure and simple face centred cubic structure. Applicability of similar assumptions to the other cases is suggested.