Exhibition of surface steps by high resolution electron microscopy of monoclinic rare earth sesquioxides |
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| Authors: | G Nihoul B Yangui C Boulesteix A Bourret C Cesari |
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| Institution: | GMET and ERA 545, UER Sciences et Techniques, Université de Toulon, F-83130 La Garde, France;Département de Physique, Faculté des Sciences de Tunis, Tunis, Tunisia;ERA 545, Faculté des Sciences St. Jérôme, F-13397 Marseille Cedex 13, France;CENG, Avenue des Martyrs, DRF Physique des Solides, 85 X, F-38041 Grenoble Cedex, France;GMET, UER Sciences et Techniques, Université de Toulon, F-83130 La Garde, France |
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| Abstract: | On high resolution structure images, the existence of a superperiod has been observed, linked with the apparition of extraspots in the diffraction diagram. The specimen (B-Sm2O3) can be described as composed of layers of thickness 6 Å, nearly perpendicular to the incident electron beam. These layers are of 3 different kinds. We have shown that the apparition of the superperiod can be linked with steps of height 6 or 12 Å (i.e. 1 or 2 layers): computed images, using this hypothesis exhibit the observed superperiod, even for thicknesses around 230 Å. This allows atomic steps to be imaged with a high resolution structure image. |
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