It is shown that the type of misfit dislocation depends on the ratio of δ/θ, where δ and θ are Δ
d/d and the twist angle respectively. From the consideration, it is demonstrated that screw-, 60°-, and edge-type misfit dislocations are formed at the interface when δ/θ<<1, = √3, and>>1, respectively. On the other hand, the interfacial energy can be expressed as Em=Eoθ' (A-Inθ') regardless of the misfit dislocation type. Moreover, an observation of a screw-type misfit dislocation, which has not been observed yet, is reported. The sources of misfit dislocation are also discussed.
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