The bonded interface was studied by means of transmission electron microscopy, and 3 dislocation networks were found at the interface. One accommodated both the lattice mismatch and the inevitable twist between the 2 crystals, whereas another accommodated the tilt that resulted from a slight vicinality of the initial surfaces. Experiment strongly suggested that the third network formed during cooling of the structure. Between the dislocation lines, the crystal structure was perfectly reconstructed across the interface; with no amorphous material being present, except for cavities which occupied a few percent of the bonded area. The geometry and distribution of these cavities could be studied by imaging the first-noted dislocation network.

G.Patriarche, F.Jeannès, J.L.Oudar, F.Glas: Journal of Applied Physics, 1997, 82[10], 4892-903