Determination of the Displacement Vector at the Anti‐Phase Boundaries in Rutile by Contrast Experiments in the Electron Microscope

Contrast experiments are used to determine by transmission electron microscopy and electron diffraction the displacement vector associated with the anti‐phase boundaries in rutile. The criteria derived elsewhere [3] for the contrast at π‐boundaries are applied, and the conditions for extinction of the contrast are also used to determine the vector. A vector of the type 1/6 〈211〉 is found, which is in disagreement with the 1/2 〈101〉 vector previously proposed [1, 2]. The method used here is general and could be used to find the displacement vector at a stacking fault or an anti‐phase boundary in other materials.