Title :

Application of scanning electron diffraction in the transmission electron microscope for the characterisation of dislocations in minerals

Author(s) :

NZOGANG, Billy Clitton [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Mussi, Alexandre [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]

Journal title :

Mineralogical Magazine

Abbreviated title :

MinMag

Volume number :

83

Pages :

71-79

Publisher :

Mineralogical Society

Publication date :

2018-07-30

HAL domain(s) :

Chimie

English abstract : [en]

We present an application of scanning electron diffraction for the characterisation of crystal defects in olivine, quartz and phase A (a high pressure hydrated phase). In this mode, which takes advantage of the ASTAR™ ...
Show more >We present an application of scanning electron diffraction for the characterisation of crystal defects in olivine, quartz and phase A (a high pressure hydrated phase). In this mode, which takes advantage of the ASTAR™ module from NanoMEGAS, a slightly convergent probe is scanned over the sample with a short acquisition time (a few tens of ms) and the spot patterns are acquired and stored for further post-processing. Originally, orientation maps were constructed from automatic indexing at each probe location. Here we present another application where images are reconstructed from the intensity of diffraction spots, producing either so-called ‘virtual’ bright- or dark-field images. We show that these images present all the characteristics of contrast (perfect crystal or defects) of conventional transmission electron microscopy images. Data are acquired with a very short time per probe location (a few tens of milliseconds), this technique appears very attractive for the characterisation of beam-sensitive materials. However, as the acquisition is done at a given orientation, fine tuning of the diffraction conditions at a given location for each reflection is not possible. This might present a difficulty for some precise, quantitative contrast analysis.Show less >

Language :

Anglais

Audience :

Non spécifiée

European Project :

MULTISCALE MODELLING OF THE RHEOLOGY OF MANTLE MINERALS

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Plasticité

Submission date :

2019-04-03T12:47:18Z
2019-04-05T13:17:03Z
2019-04-09T14:30:35Z
2019-04-30T11:18:05Z