Application of many-beam theory of diffraction contrast for examination of nature of faults in Co3Pd ordered films
Single crystal Co3Pd films were prepared by usual method of vacuum evaporation of alloy co0.75Pd0.25 on the (001)-plane of MgO single crystal heated up to 260°C at pressure of 10-4 torr. The films were annealed at 650°C for two hours with following cooling to the room temperature with speed of 0.5 dg/min at pressure of 10-5 torr. The alloy films of about 600 Å thick were examined. The structure of the CO3Pd films was investigated with transmission electron microscopy, operating at 100 kV. The deviation of the origin of the Ewald sphere from the symmetrical position was determined from the position of the Kikuchi lines. Films were oriented so that only reflections along the 010 systematic row were strongly excited. The film surface was parallel to the (00l)-plane (Fig.1a). The Co3Pd films had an ordered L12 lattice. Observed light-field images contains a large amount of the fringes, oriented along the [110] and [100] (Fig.lb).