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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


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 - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université Lille 1, Sciences et Technologies - Lille 1 (FRANCE)
Other partners > Université de Reims - Champagne-Ardenne (FRANCE)
Laboratory name:
CONACYT (Ref. No. 203257)
Deposited On:07 Sep 2015 12:43

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