Eur. Phys. J. Appl. Phys.
Volume 67, Number 2, August 2014
|Number of page(s)||6|
|Section||Nanomaterials and Nanotechnologies|
|Published online||01 August 2014|
Probe size study of apatite irradiation in stem
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: firstname.lastname@example.org
Revised: 31 October 2013
Accepted: 5 June 2014
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.
© EDP Sciences, 2014
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