What is it about?
Bragg coherent diffraction imaging (BCDI) is a lensless X-ray imaging technique that allows measurement of the lattice displacement field in nano-crystals. By capturing multiple reflections from the same crystal, the full displacement vector field and hence strain tensor field in nano-crystals can be measured. Previously complicated alignment made these measurements impractical. Here we present an easy pre-alignment procedure, using micro-beam Laue diffraction, and demonstrate the use of multi-reflection BCDI for imaging of focussed ion beam milling induced strains in a gold nano-crystal.
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Why is it important?
We present a straightforward procedure for aligning, performing and analysing multi-reflection Bragg coherent diffraction imaging measurements. Our new approach opens the door to routine full strain tensor imaging in nano-crystals with 10s of nm 3D spatial resolution. Access to the full strain tensor at this scale is essential for understanding structure-function relationships at the nano-scale.
Perspectives
Our new approach makes it easy to perform and analyse multi-reflection Bragg coherent diffraction measurements. These measurements will enable the study of complex 3D lattice strain fields in nano-crystals, information that is key to assessing defect behaviour at the nano-scale. Furthermore capturing more than 3 reflections finally provides a way of checking the reliability and consistency of phase retrieval algorithms used for the analysis of coherent diffraction data.
Felix Hofmann
University of Oxford
Read the Original
This page is a summary of: Micro-beam Laue alignment of multi-reflection Bragg coherent diffraction imaging measurements, Journal of Synchrotron Radiation, August 2017, International Union of Crystallography,
DOI: 10.1107/s1600577517009183.
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