Metal/ceramic interfaces were produced by depositing Al onto {100} MgO substrates in a molecular beam epitaxy system. The interface was then studied by using high-resolution electron microscopy. Atomistic modelling of the effects of mismatch and bonding strength at metal/ceramic interfaces showed that the misfit could be controlled. The model was applied to a simple case with mismatch in one direction, and the energies and atomic structures were calculated for various mismatches. The structure of the misfit dislocations was shown to depend upon the mismatch. A clear trend, from de-localized structures to localized ones that behaved like bulk-like dislocations, could be seen for decreasing misfits at constant interaction, and increasing interaction at constant misfit.

W.P.Vellinga, J.T.M.De Hosson: Physica Status Solidi A, 1995, 149[1], 95-103