Abstract
In 1949 Frank and van der Merwe (1) considered the accommodation of misfit between one crystal and another using a simple model. The model consisted of a linear chain of atoms that was placed on a substrate in which there were sinusoidal corrugations. They showed that - in systems where the bonding between the atoms in the chain was comparable to the bonding of the atoms to their substrate - it was energetically favorable for a misfit of ≲ 7% to be accommodated by strain. An experimental system which resembles the one considered by Frank and van der Merwe, and is particularly well suited to test their predictions, is the bubble model of Bragg and Nye (2). Figure 1(a) shows a row of soap bubbles that is separated from a raft of bubbles by a barrier. The misfit between the row and raft is ∽7% . Figure 1(b) shows the bubbles after removal of the barrier. It can be seen that all the misfit is accommodated by strain.
Publisher
Cambridge University Press (CUP)