The use of high-resolution transmission electron microscopy revealed vibrations of a 29.7 (100) symmetrical tilt boundary in a thin foil. An analysis of the experimental results suggested that the grain boundary motion could be described in terms of a frequency and an amplitude. The equivalent parameters were an effective mass and a spring constant. A comparison with published data suggested that grain boundaries could be roughly classified into 4 classes, according to the magnitudes of their static and dynamic energies.

W.Wunderlich: Materials Science Forum, 1996, 207-209, 141-4