Measurement of the lattice displacement across a coincidence grain boundary

Abstract

Moiré fringe patterns, formed in electron images of one crystal superimposed on another, have been used to determine the departure from the model for a coincidence grain boundary which assumes that the coincidence lattice is continuous across the boundary. The boundary studied was the {112} lateral twin boundary in gold. The measurements revealed that the crystals on either side of the boundary were displaced towards one another by a distance which varied greatly but whose average value was 0.056 nm.