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Probe size study of apatite irradiation in stem

Published online by Cambridge University Press:  01 August 2014

Étienne F. Brès ,
José Reyes-Gasga ,
Christian Rey  and
Jean Michel
Étienne F. Brès*
Affiliation:
Unité des Matériaux et Transformation (UMET), Université des Sciences et Technologies de Lille, Bâtiment C6, 59650 Villeneuve d’Ascq, France
José Reyes-Gasga
Affiliation:
Unité des Matériaux et Transformation (UMET), Université des Sciences et Technologies de Lille, Bâtiment C6, 59650 Villeneuve d’Ascq, France
Christian Rey
Affiliation:
École Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiques Cirimat-Ensiacet, Ensiacet 4 allée Émile Monso, BP44362, 31030 Toulouse cedex 4, France
Jean Michel
Affiliation:
Laboratoire de Recherche en Nanosciences LRN EA4682, UFR Sciences Université de Reims, 21, rue Clément Ader, 51685 Reims cedex 02, France
*
ae-mail: etienne.bres@univ-lille1.fr
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Abstract

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.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 67 , Issue 2 , August 2014 , 20401
Copyright
© EDP Sciences, 2014

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