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All issues Volume 67 / No 2 (August 2014) Eur. Phys. J. Appl. Phys., 67 2 (2014) 20401 Abstract
Eur. Phys. J. Appl. Phys.
Volume 67, Number 2, August 2014
Nanomaterials and Nanotechnologies
https://doi.org/10.1051/epjap/2014130104
Eur. Phys. J. Appl. Phys. (2014) 67: 20401
Probe size study of apatite irradiation in stem
Étienne F. Brès1a, José Reyes-Gasga1,b, Christian Rey2 and Jean Michel3
1 Unité des Matériaux et Transformation (UMET), Université des Sciences et Technologies de Lille, Bâtiment C6, 59650 Villeneuve d'Ascq, France
2 École Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiques Cirimat-Ensiacet, Ensiacet 4 allée Émile Monso, BP44362, 31030 Toulouse cedex 4, France
3 Laboratoire de Recherche en Nanosciences LRN EA4682, UFR Sciences Université de Reims, 21, rue Clément Ader, 51685 Reims cedex 02, France
a e-mail: etienne.bres@univ-lille1.fr
Revised: 31 October 2013
Published online: 1 August 2014
The effect of electron beam irradiation of stoichiometric hydroxyapatite (Ca10(PO4)6(OH)2, HAP) is investigated using electron energy loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) mode equipped with a LaB6 gun. Initial irradiation at 160 A cm−2 dose rate shows no modification of the low loss spectra. No difference of mass loss for Ca, O and P is observed for two different probe diameters: 4 nm (dose rate = 160 A cm−2) and 24 nm (dose rate = 70 A cm−2). Furthermore no formation of CaO is observed for both experimental conditions. It is proposed that the low values of both electron dose rates and doses (from 350 to 2400 C cm−2) avoid mass loss. At the higher dose rate obtained with a field emission gun (FEG), transformations are observed for the lowloss signal as well as for the Ca, P and O signals. These results might be very useful for the future studies of apatite particles at the nanoscale.
Present address: Instituto de Física, UNAM, Circuito de la Investigación s/n, Ciudad Universitaria, 4510 Coyoacan, México, D.F.
© EDP Sciences, 2014
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