Antiphase boundaries motion

S.M. Allen and J.W. Cahn. Microscopic theory for antiphase boundary motion and its application to antiphase domain coarsening. Acta Metall., 27(6) 1085-1095, 1979. 

V.Yu. Dobretsov, G. Martin, F. Soisson and V.G. Vaks, Effects of the Intersic-tion between Order Parameter and Concentration on the Kinetics of Antiphase Boundary Motion, Europhys. Lett. 31(7), 417-422 (1995). 

Diffuse interfaces of certain types can move by means of self-diffusion. One example is the motion of diffuse antiphase boundaries which separate two ordered regions arranged on different sublattices (see Fig. 18.7). Self-diffusion in ordered alloys allows the different types of atoms in the system to jump from one sublattice to the other in order to change the degree of local order as the interface advances. This mechanism is presented in Chapter 18. 

Many other examples of extended dislocations exist. Their further discussion will be deferred to the section on planar defects except for the case of superlattice dislocations. The ordered Cuj Au structure and antiphase domains have already been described in the introduction. While (a/2)<110> is a lattice translation vector in the face-centered cubic structure, it is not a lattice translation vector in ordered CujAu. Motion of a dislocation with b = ( /2)<110> in the ordered CujAu creates an antiphase domain boundary. Motion of a second dislocation through the structure with the same b restores the perfect order since a<110> is a lattice translation vector the structure of CujAu is simple cubic. Pairs of imperfect dislocations with, for example, b = (fl/2)[110] are thus expected. Such pairs, called superlattice dis-... 

It should be noted that the LEED patterns observed for halogen adsorption on the bcc surfaces can also be explained by regularly spaced antiphase domain boundaries [82B]. Such models, however, yield unrealistically small distances between the adsotbed halogen atoms and require complicated concerted motion of the adatoms to obtain continuously varying LEED patterns [82J], Further, electronic band stmcture studies performed on chemisorbed halogen layers on Fe(llO) support the formation of the incommensurate compression phases described above [91M],... 

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