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"High pressure neutron scattering in a diamond anvil cell – applications for materials synthesis"

MATERIALS  SEMINAR                                                Department of Materials Science & Engineering
Tuesday January 22, 2019
2:15PM – 3:15PM ~ SERF 307
Please join us for refreshments at 2:10

"High pressure neutron scattering in a diamond anvil cell – applications for materials synthesis"
Dr. Bianca Haberl-Neutron Scattering Division                      Neutron Sciences Directorate
Oak Ridge National Laboratory- Oak Ridge, TN
High pressure neutron scattering is an invaluable tool for the understanding of phase behaviors and synthesis pathways of materials containing light elements such as hydrogen, nitrogen or carbon. This understanding is critical for the many new and exotic states of matter that can be formed under high pressure such as hydrides with superconductivity close to room temperature or carbon-nitrogen materials with mechanical properties similar to that of diamond itself.
In the past, neutron scattering at high pressures has been limited in pressure due to a comparatively low neutron flux which requires large samples. Thus, pressures were typically limited to ~20 GPa for neutron diffraction and to ~4 GPa for neutron spectroscopy. At Oak Ridge National Laboratory, we have developed a set of new, large-volume neutron diamond anvil cells (DAC) that overcome these limitations. The latest configurations of this cells can be used with an inexpensive form of polycrystalline diamond up to ~10 GPa for inelastic scattering. Furthermore, a configuration with very large multi-carat, single crystal CVD diamonds is also available for diffraction whereby record pressures of 60 GPa have been obtained on powder samples.
In this presentation, I will first give a brief introduction to the technical aspects of these new opportunities for high pressure neutron scattering. Then I will present several examples from the field of high-pressure materials synthesis with a focus on the Group IVa elements carbon, silicon and germanium and some of their composites.

Bianca Haberl received her M.Sc. (Physics) from the University of Augsburg, Germany in 2006 and her Ph.D (Physics) from the Australian National University, Australia in 2011. After a postdoctoral fellowship at the Australian National University, she joined ORNL’s Neutron Sciences Directorate in 2014 as a Weinberg Fellow. She has now the varied role of High Pressure Scientist, where she works in sample environment, has been instrument scientist on the dedicated high pressure beamline and leads the High Pressure Science Initiative. Her personal research focuses on various ways of high pressure synthesis of novel, useful structures from the Group IV elements carbon, silicon and germanium.  Thereby, she employs a suite of high pressure methods (diamond anvil cells, but also point loading and laser-induced microexplosions) and a range of different precursor materials (in particular amorphous and disordered materials with varying degrees of structural ordering and hydrogen contents).

Tuesday, January 22, 2019 at 2:10pm to 3:15pm

Science & Engineering Building, 307
1414 Circle Dr, Knoxville, TN 37996

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Lectures & Presentations




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Ashley Cole

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