Please refer to cababilities described in our exhaustive last 5 years activity report. The page below gives main aspects of the technique. Don't hesitate to contact BM32 staff.

Last 5 years Laue microdiffraction and LaueTools publications

Motivations and Goals

The applications to micro and nano objects call for intense narrow X-ray beams available at latest generation synchrotron only. The strong demand for structural characterization of objects with ever decreasing sizes has driven the development of new methods to go beyond the average internal structure down to the local structure determination. Probing the local strain, shape (size, orientation) and composition of micro and nano materials are the main objectives of our Laue micro-diffraction setup, this setup being the first in Europe.

The microdiffraction setup is operational since 2006.

Laue Pattern single crystal UO2 covered by three variants of U3O7 (quadratic expansion 3% along a*,b* and c*)Left: Laue pattern of a single crystal. Middle: orientation map of CdTe polycrystals. Right: (311) peak elongation width 3D map (in situ fatigue loading)

Polychromatic beamsize on sample (Full-Width-at-Half-Maximum): 300 x 300 nm2

When using the sample translation stages, sample surface is tilted by 40 degrees with respect to the beam and the horizontal plane. This inclination increases by approximately 50% the actual footprint of the beam in the vertical direction only.

Spectral energy ranges currnetly from 5 to 23 keV

High energy limit can be lowered by changing optics mirrors angles down to typically 12-15 keV. This setup is suitable for disentangling Laue Patterns coming from many grains with large amount of peaks (large unit cell dimensions or/and atoms with high Z values)

Installation and Alignment duration

Installation of the entire setup (KBs , sample translations, CCD, other equipments...) from scratch to microsized white beam delivered to users takes generally only few hours. For energy measurements (full stress/strain tensor or 6 lattice parameters) by rainbow technique (transmission diamond)

Data Analysis with LaueTools

Laue Microdiffraction Data can be handled and reduced by the home developed and open source Software: LaueTools

LaueTools software package development:

Main page of the project

Online Documentation (under construction)

Browse the codes: https://gitlab.esrf.fr/micha/lauetools/-/tree/master/LaueTools

You can install lauetools running with python 3 on windows 7, windows 10 & linux by the command:

pip install lauetools

Presentations:

Tutorial document for HERCULES school (March 2020):  Laue Introduction

ANF Laue Microdiffraction: de la mesure à l'analyse (sept.2017): Data analysis (in french)

Scisoft Meeting at ESRF:  "LaueTools: a software package for Laue MicroDiffraction Data Analysis"  (29th July 2010)

Laue Microdiffraction: Ecole GDR MECANO Autrans (March 2010) : tutorial

BeamLine Review Panel 2010 one page general presentation of the microdiffraction setup available at this date.

Laue Microdiffraction: Workshop GDR MECANO (september 2009): Automatic analysis: dream or reality ?

Laue Microdiffraction: Workshop GDR MECANO (september 2009): LaueTools

LaueTools Screenshots & Examples:

pre -analysis based on images analysis

from a set of images (collected during a sample scan or with time or experimental parameter) to visualise and select sample ROIs for further measurements or finer analysis...

Mosaic plot: 2D map of a given Laue spot (grid corresponds to sample position)

mosaic.jpg

2D map of numerical scalar quantity from a given ROI of the 2D detector

mosaicSn.jpg

peak search

single image analysis

peaksearchboard2.jpgpeaksearchboard.jpg

batch analysis

indexing

single image analysis

batch analysis

Multiple grains Simulation

twins, deformation rotation, texture

peaks elongation (slip systems)