Misfit dislocations at Ag/Mn3O4, Cu/MnO and Cu/Mn3O4 interfaces

Parallel close-packed plane interfaces between MnO or Mn3O4 and Ag or Cu are studied using high resolution transmission electron microscopy (HRTEM) and atomistic calculations. The study is aimed at determining the network of misfit dislocations at these interfaces. Due to the projective nature of HRTEM, an atomistic model incorporating the displacements associated with the possible misfit-dislocation network appear to be of great value. The following results are obtained. Ag/Mn3O4: an array of dislocations with line direction [ITO] and alternating Burgers vectors 1/6[11(2) over bar] and 1/3[11(2) over bar], Cu/MnO: a trigonal network of edge dislocations with Burgers vectors of the 1/6[112] type and line direction [110], Cu/Mn3O4: the Burgers vectors with reference to Cu remain of 1/6[112] type, but due to a slight change in line direction with respect to [110] obtain some screw character. (C) 1997 Acta Metallurgica Inc.