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»ã±¨±êÌâ(Ó¢ÎÄ)£ºPrecession electron diffraction and its applications in materials science
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»ã±¨ÄÚÈݼò½é£ºA double conical beam-rocking system, so-called precession electron diffraction (PED), or simply electron precession, was initially proposed by Vincent and Midgley in 1994 [1]. Over recent years, the application of this new technique has attracted more and more interest following the availability of commercial equipments being compatible with analytical transmission electron microscopes. In comparison with conventional diffraction techniques, such as microdiffraction, PED shows some significant advantages: (I) Integrated intensities of the reflections present in a PED pattern can be taken into account, while only positions of the reflections are available for a conventional diffraction pattern. (II) PED allows collection of more reflections than with conventional diffraction. (III) Dynamical effects are reduced by the off-axis beam inclination and few beam conditions are encountered so that the kinematical forbidden reflections can be identified. (IV) Indexing of a PED pattern can be done in the usual way. (V) There is no need for perfect zone axis orientation during recording of a PED pattern. This talk presents electron ray-paths of the PED technique and interprets the formation of a PED pattern using the Ewald sphere. Some practical applications of this technique in materials science for determining twin laws, ‘ideal’ symmetry, state of order, space groups and for identifying (new) phases are also addressed [2-10].
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»ã±¨È˵¥Ôª(Ó¢ÎÄ)£ºUniversité Lille 1, France
