title: Performances of an 80-200 kV microscope employing a cold-FEG and an aberration-corrected objective lens.
abstract: The performances of a newly developed 80-200 kV cold field emission gun (CFEG) transmission electron microscope (TEM) integrating a spherical aberration corrector for a TEM image-forming lens have been evaluated. To begin, we show that the stability of both emission and probe currents makes use of this new CFEG much friendlier. The energy spread of electrons emitted from the CFEG has been measured as a function of emission current and shows a very last 0.26 eV energy resolution at 200 kV and even 0.23 eV at 80 kV. The combination of the CFEG and the CEOS™ aberration corrector, associated with enhanced mechanical and electrical stabilities of this new microscope, allows reaching an information transfer below 75 pm at 200 and 80 pm at 80 kV. This unseen resolution at 200 kV has allowed us to study the structure of CoPt nanoparticles by observing direct images of their atomic arrangement along the high indexes zone axis. We have evidenced the presence of defects in these nanostructures that are not parallel to the electron beam. The precise stoichiometry of two iron oxides, FeO and Fe2O3, has been determined from an analysis of iron valence state that was obtained from a direct analysis of EELS fine structures spectrum of the two oxides.
authors.affiliation: Laboratoire Matériaux et Phénomènes Quantiques, Université Paris 7/CNRS, UMR 7162, Case 7021, 75205 Paris Cedex 13, France. christian.ricolleau@univ-paris-diderot.fr
authors.forename: Christian
authors.initials: C
authors.lastname: Ricolleau
authors.forename: Jaysen
authors.initials: J
authors.lastname: Nelayah
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Oikawa
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kohno
authors.forename: Nadi
authors.initials: N
authors.lastname: Braidy
authors.forename: Guillaulle
authors.initials: G
authors.lastname: Wang
authors.forename: Florian
authors.initials: F
authors.lastname: Hue
authors.forename: Lenuta
authors.initials: L
authors.lastname: Florea
authors.forename: Véronique
authors.initials: V
authors.lastname: Pierron Bohnes
authors.forename: Damien
authors.initials: D
authors.lastname: Alloyeau