SEM and µ-Raman characterization of electron beam damages on fluor-apatites : Implication for EPMA analysis.

Abstract : Apatites are phosphate minerals of a general formula Ca5(PO4)3(OH,Cl,F). They are are the principal constituent of teeth and bone (natural and synthetic); represent an important accessory minerals in volcano geological environment by means as a storage of elements such as halogens, sulphates, carbonates, Sr and REE; represent a packaging of radionuclides for nuclear waste, trapping heavy metals and finally are mostly used fertilizers. This work is focused on fluorapatite, the Fluorine-rich composition. As mentioned by several authors, SEM and EPMA analysis of F-apatites is complicated by the strong consequences of electron beam damages. This problem is particularly strong for the determination of fluorine concentration. Indeed a complex intensity variation is observed for the fluorine signal collected by the spectrometer; this variation mainly depends on two parameters: crystal orientation of the mineral grain and electron beam setup. Crystallographically-oriented Fluor-apatite were irradiated under the EPMA electron beam, using different setup (i.e. acceleration voltage, beam current, beam size) following the F, Ca and P WDS-variations signal. Beam damages were characterized by SEM and µ-Raman (including Raman-in-SEM).
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https://hal-brgm.archives-ouvertes.fr/hal-01011944
Contributeur : Guillaume Wille <>
Soumis le : mercredi 25 juin 2014 - 09:48:36
Dernière modification le : vendredi 10 mai 2019 - 13:54:16
Document(s) archivé(s) le : mardi 11 avril 2017 - 08:30:50

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  • HAL Id : hal-01011944, version 1

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Guillaume Wille, Ida Di Carlo, Abdeltif Lahfid. SEM and µ-Raman characterization of electron beam damages on fluor-apatites : Implication for EPMA analysis.. EMAS 2014 : 11th EMAS Regional Workshop on ELECTRON PROBE MICROANALYSIS OF MATERIALS TODAY - PRACTICAL ASPECTS, Sep 2014, Leoben, Austria. ⟨hal-01011944⟩

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