Effect of Diffraction Geometry on Lattice Images of Dislocations (original) (raw)

Proceedings, annual meeting, Electron Microscopy Society of America, 1972

Abstract

It was shown recently that the number of terminating fringes and fringe bending at inclined dislocations in germanium were sensitive to the diffraction geometry. The present experiments were designed to explore the situation for dislocations nearly normal to the foil.Germanium was selected since dislocations are immobile at room temperature A (110) oriented crystal slice was chemically thinned in a 95/5 mixture of nitric and hydrofluoric acids. Foils were examined in the high resolution stage of a Philips EM300 microscope modified to give a maximum magnification of one million. The specimen was oriented to give a strong zone of {111} systematic reflections, and {111} lattice images (3.27Å spacing) produced by the 2-beam tilt technique. The electromagnetic beam deflector was set-up so that the tilt switch could be used to switch from the +g to -g image. It was found possible to do this at one million magnification without appreciable change in image quality, field or focus, permittin...

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