Titre :

Reliability of multigrain indexing for orthorhombic polycrystals above 1 Mbar: application to MgSiO₃ post-perovskite

Auteur(s) :

Langrand, Christopher [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Hilairet, Nadege [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Nisr, Carole [Auteur]
Roskosz, Mathieu [Auteur]
Ecole Nationale Supérieure de Chimie de Lille [ENSCL]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Ribárik, Gábor [Auteur]
Vaughan, Gavin B.M. [Auteur]
Merkel, Sébastien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]

Titre de la revue :

Journal of Applied Crystallography

Numéro :

50

Pagination :

120-130

Date de publication :

2017

Discipline(s) HAL :

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

Résumé en anglais : [en]

This paper describes a methodology for characterizing the orientation and position of grains of an orthorhombic polycrystalline material at high pressure in a diamond anvil cell. The applicability and resolution of the ...
Lire la suite >This paper describes a methodology for characterizing the orientation and position of grains of an orthorhombic polycrystalline material at high pressure in a diamond anvil cell. The applicability and resolution of the method are validated by simulations and tested on an experimental data set collected on MgSiO3 post-perovskite at 135 GPa. In the simulations, similar to 95% of the grains can be indexed successfully with similar to 80% of the peaks assigned. The best theoretical average resolutions in grain orientation and position are 0.02 degrees and 1.4 mu m, respectively. The indexing of experimental data leads to 159 grains of post-perovskite with 30% of the diffraction peaks assigned with a 0.2-0.4 degrees resolution in grain orientation. The resolution in grain location is not sufficient for in situ analysis of spatial relationships at high pressure. The grain orientations are well resolved and sufficient for following processes such as plastic deformation or phase transformation. The paper also explores the effect of the indexing parameters and of experimental constraints such as rotation range and step on the validity of the results, setting a basis for optimized experiments.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
ENSCL
CNRS
INRA

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Matériaux Terrestres et Planétaires

Date de dépôt :

2019-05-16T17:19:46Z
2024-07-10T08:59:51Z