Electron optical study of rutile

Abstract

Convergent-beam electron diffraction has been used to confirm the accepted space group of rutile (TiOz) and to study in detail the dependence of the intensity of the space-group-forbidden reflections on crystal thickness and orientation. The observations are shown to be in detailed agreement with computersimulated patterns calculated using the standard structural parameters. The diffraction results provide a basis for understanding the high-resolution electronmicroscope images of rutile crystals oriented close to the 1-001] zone in which the effects of the space-groupforbidden reflections are important. It is concluded that satisfactory agreement exists between experimental and calculated images provided that allowance is made for uncertainty in the orientation of the crystal.