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Probe size study of apatite irradiation in stem

Brès, Étienne F. and Reyes-Gasga, José and Rey, Christian and Michel, Jean Probe size study of apatite irradiation in stem. (2014) The European Physical Journal Applied Physics, 67 (2). 1-6. ISSN 1286-0042

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Official URL: http://dx.doi.org/10.1051/epjap/2014130104

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.

Item Type:Article
Additional Information:Thanks to EDP Sciences editor. The definitive version is available at http://www.epjap.org The original PDF of the article can be found at EDP Sciences website : http://www.epjap.org/articles/epjap/abs/2014/08/ap130104/ap130104.html
HAL Id:hal-01194744
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Lille - ENSCL (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université Lille 1, Sciences et Technologies - Lille 1 (FRANCE)
Other partners > Université de Reims - Champagne-Ardenne (FRANCE)
Laboratory name:
Funders:
CONACYT (Ref. No. 203257)
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Deposited By: cirimat webmestre
Deposited On:07 Sep 2015 12:43

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