CONVERGENT-BEAM ELECTRON-DIFFRACTION

The development of new materials requires an understanding of their mo de of growth and the nature of defects, interfaces and strains thereby incorporated. This paper shows how convergent beam electron diffracti on (CBED) and large angle CBED (LACBED) can be used to analyse such pr oblems. It is shown how CBED and LACBED can give two-beam rocking curv es, which can be used to profile plane rotations, strain and compositi on in multilayer structures, and to determine rigid body displacements at stacking faults and interfaces. In addition LACBED has become a po werful technique for the analysis of dislocations. The recent applicat ion of LACBED to determine the Burgers vectors of stair-rod and other partial dislocations is explained.