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Nuclear Instruments and Methods in Physics Research Research Section B: Beam Interactions with Materials and Atoms 286 (2012) 258-261
HRTEM study of track evolution in 120-MeV U irradiated Gd2Ti2O7
I. Jozwik-Biala1, J. Jagielski1, 2, L. Thomé3, B. Arey, L. Kovarik, G. Sattonnay4, A. Debelle3, I. Monnet5

High resolution Scanning Transmission Electron Microscopy (HRTEM) experiments were performed on Gd2Ti2O7 pyrochlore irradiated with 120-MeV U ions. A judicious choice of irradiation energy, sample preparation (using Focused Ion Beam) and analytical technique (HRTEM) allowed us to visualize the complete evolution of tracks from the surface of samples down to depths exceeding the projected range of irradiating ions. Such features as variation of track diameters, changes in track directions and discontinuous segments of tracks were clearly documented at various depths. By using two different scanning transmission electron microscopy (STEM) imaging modes: High- and Low-Angle Annular Dark Field imaging (HAADF and LAADF), it was possible to observe the radial substructure of tracks composed of an amorphous core surrounded by a damaged and strained crystalline envelope.
1 :  IEMT - Institute of Electronic Materials Technology
2 :  The Andrzej Soltan Institute for Nuclear Studies
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
4 :  ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
5 :  CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
Physique/Matière Condensée/Science des matériaux

Sciences de l'ingénieur/Matériaux
Swift Heavy Ion Irradiation – Track Formation – Focused Ion Beam – High Resolution Transmission Electron Microscopy