Abstract
Computer simulations of two crystals with parallel faces at a number of fixed separations have been performed. The exposed surfaces were (100) planes of a face-entered-cubic lattice. Depending on the temperature, interaction between the surfaces begins to occur at separations of a few lattice spacings. The outer planes relax towards each other and in runs at higher temperatures bridges form between the surfaces. At one lattice spacing there are no bridges, but the crystals fuse to form a single stretched crystal. The formation of bridges is correlated with the existence of surface disorder on the free surfaces, and arises from the interaction of mobile atoms in overlayers on such surfaces, but the atoms in the bridges are pulled from the outer layers of the crystal as well as from the overlayers. The presence or absence of these bridges has a considerable effect on the energy of the system and the force between the surfaces.
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