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Palestra - Condensed Matter Research at the ORNL’s Neutron Sources

António Moreira dos Santos

Oak Ridge National Laboratory

18 de junho de 2019, 14:30

Anfiteatro -117, Edifício FC3

Neutron scattering is a unique tool in materials sciences. It allows studies on problems mostly inaccessible through other techniques, such as direct interrogation on the location of light elements, unveiling complex magnetic structures, or the non-destructive testing of large engineering parts. Unlike visible light (Lasers) and X-rays, neutrons beams for materials research can only be produced in dedicated facilities, such as nuclear reactors or spallation sources. The Oak Ridge National Laboratory is unique in that it houses both neutron sources, the Spallation Neutron Source (SNS) and the High Flux Isotope Reactor (HFIR), making it arguably the leading laboratory in the world for neutron scattering research. These facilities enable investigations over a broad range of materials, in the form of powders, glasses and single crystals. Here we will illustrate the promise of neutron diffraction to physics and chemistry research. We will show examples comprising, for example, magnetic phase diagrams in lanthanides, phase competition in manganites and structural studies of clathrate hydrates. These examples will highlight how the use of the neutron scattering can assist in pursuing exciting science. Finally, ongoing improvements and additions to the SNS capabilities will be discussed: facility capabilities, instrument improvements and new sample environment devices that open a new frontier in neutron scattering.

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