Structural Complexity in the Lanthanide Elements at High Pressure
|Start date||14-04-2015 09:00|
|Finish date||14-04-2015 10:00|
|Location||Room 500 - 501, Central Building|
|Speaker's name||Rachel HUSBAND|
|Speaker's institute||University of Edinburgh / UK|
|Contact name||Eva Jahn-Feppon|
|Host name||MEZOUAR Mohamed|
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The ESRF has played a major international role in the development of our understanding of how materials behave when subjected to extremely high pressures. In particular, the use of angle-dispersive diffraction techniques, combined with high-energy, micro-focussed x-rays, has led to the realisation that many elements Adopt high-pressure crystal structures that are very much more complex than previously thought.
Over the last four years, I have used a combination of angle-dispersive synchrotron x-ray diffraction and ab initio indexing to investigate the high-pressure structural behaviour of mid-Z lanthanide elements. Extremely high-resolution diffraction data collected at the ESRF, PETRA-III and Diamond Light Source made it possible to identify subtle features in the diffraction patterns that are characteristic of the complex high-pressure phases found in these elements. Eu was found to adopt two different incommensurately-modulated crystal structures at high pressures. This is the first observation of an incommensurate structure in the lanthanide elements, and the first observation of an incommensurately-modulated to incommensurately-modulated structural transition in the elements.
In this talk, I will highlight the main results of the research I conducted over the last 4 years, and how this work can be extended in the future. I will also discuss future projects I wish to develop at ID27.
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