One-dimensional long-period superstructures in Cu3Pd observed by high-resolution electron microscopy

One-dimensional long-period superstructures (LPS) in Cu 3 Pd have been studied by electron diffraction and high-voltage high-resolution electron microscopy. Use of a high accelerating potential (800 to 1000 kV) for the electron microscope has resulted in micrographs showing well-defined antiphase boundaries. Boundaries contain frequent jogs in specimens of low Pd content. These observations contrast with previous electron microscopy studies which failed to resolve sharp boundaries presumably because of dynamical diffraction effects of lower energy (200 kV) electrons.