Titre :

Light Element (C, N, O) Quantification by EDXS: Application to Meteorite Water Content and Organic Composition

Auteur(s) :

Le Guillou, Corentin [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Zanetta, Pierre-Marie [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Blanchenet, Anne-Marie [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Marinova, Maya [Auteur]
Institut Chevreul - FR2638

Titre de la revue :

Microscopy and Microanalysis

Numéro :

30

Pagination :

660-670

Éditeur :

Cambridge University Press (CUP)

Date de publication :

2024-08-06

ISSN :

1431-9276

Mot(s)-clé(s) en anglais :

EDXS
light elements (Carbon
Nitrogen
Oxygen)
meteorites
transmission electron microscopy

Discipline(s) HAL :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre

Résumé en anglais : [en]

Quantifying light elements such as carbon, nitrogen, and oxygen in a transmission electron microscope (TEM) is a challenging however essential task in biology, materials, or earth and planetary sciences. We have developed ...
Lire la suite >Quantifying light elements such as carbon, nitrogen, and oxygen in a transmission electron microscope (TEM) is a challenging however essential task in biology, materials, or earth and planetary sciences. We have developed an approach that allows precise quantification by energy-dispersive X-ray spectroscopy (EDXS), using sensitive windowless silicon drift detectors and homemade Python routines for hyperspectral data processing. K-factors were determined using wedge-shaped focused ion beam sections. To correct for X-ray absorption within the sample, the sample mass thickness is determined by the—revisited—two-lines method (Morris, 1980). No beam current measurement is required. Applying this method to the K and L lines of iron, we found that the tabulated mass absorption coefficient at the energy of the iron L lines was too low. This is due to X-ray self-absorption at the iron edge. Using reference material, we experimentally determined an absorption coefficient that gave the expected results. We then analyzed the complex phyllosilicate mixture of the Orgueil meteorite. We show that the N/C ratio of organics can be obtained with an accuracy better than 5 at.% and that oxygen can be quantified accurately enough to infer the hydroxyl content of phyllosilicates.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Matériaux Terrestres et Planétaires

Date de dépôt :

2024-09-11T07:59:16Z
2024-09-11T12:54:57Z
2024-11-22T08:13:55Z