Rigid-body displacement perpendicular to a {211} twin boundary in Mo

Rigid-body displacement perpendicular to a symmetrical {112} grain boundary in a Sigma = 3 Mo bicrystal was measured using the x-fringe method. The grain boundary contained a set of parallel intrinsic dislocations accommodating the deviation from the exact coincidence. The observed images were compared with theoretical image simulations. This procedure enabled us to eliminate the influence of dislocations on the measurement of the displacement. The result was compared with the expansion previously determined by high-resolution electron microscopy and by theoretical atomic simulations.