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Condensed Matter Seminars This Term

ics Condensed Matter
Thursday, August 24, 2017
11:00 AM
Physics Building, Room 313

"Available"
ics Condensed Matter
Thursday, August 31, 2017
11:00 AM
Physics Building, Room 313

"Available"
ics Condensed Matter
Thursday, September 7, 2017
11:00 AM
Physics Building, Room 313
Maiko Kofu [Host: Despina Louca]
JPARC, Japan
"Structure and dynamics of hydrogen in nanocrystalline palladium"
ABSTRACT:

The behavior of hydrogen in metals has attracted much attention in fundamental and applied research areas. Palladium hydride (PdHx) is a typical metal-hydrogen system and has been studied for many decades. Pd has remarkable abilities to absorb plenty of H atoms and the H atoms are highly mobile in the Pd lattice. It is interesting to examine how the properties are changed as the particle size is reduced to a nanometer-scale. We have investigated structure, diffusion and vibrational dynamics by means of neutron scattering techniques for both bulk and nanocrystalline PdHx with a diameter of 8nm. Neutron diffraction work on nanocrystalline sample demonstrated that some of hydrogen atoms are accommodated at the tetrahedral (T) sites. This is in contrast to bulk PdHx with octahedral (O) occupation. In quasielastic scattering measurements, we found an additional fast diffusion process with a small potential barrier in nanocrystalline PdHx. Furthermore, our inelastic scattering works revealed that nanocrystalline PdHx exhibits two distinct vibrational excitations; one resembles that observed in bulk PdHx and the other is the excitations appeared at higher energies. The additional diffusion process and vibrational states are attributed to the H atoms at T sites near the surface of nanoparticles. The potential shape around the T site near the surface will be discussed in the seminar.

ics Condensed Matter
Thursday, September 14, 2017
11:00 AM
Physics Building, Room 313
RESERVED
ics Condensed Matter
Thursday, September 21, 2017
11:00 AM
Physics Building, Room 313

"Available"
ics Condensed Matter
Thursday, September 28, 2017
11:00 AM
Physics Building, Room 313
Dmytro Pesin [Host: Gia-Wei Chern]
University of Utah
"TBA"
ics Condensed Matter
Thursday, October 5, 2017
11:00 AM
Physics Building, Room 313
Bryan Chen [Host: Jeffrey Teo]
University of Pennsylvania
"TBA"
ics Condensed Matter
Thursday, October 12, 2017
11:00 AM
Physics Building, Room 313
RESERVED
ics Condensed Matter
Thursday, October 19, 2017
11:00 AM
Physics Building, Room 313
Charles Reichhardt [Host: Gia-Wei Chern]
Los Alamos National Lab
"TBA"
ics Condensed Matter
Thursday, October 26, 2017
11:00 AM
Physics Building, Room 313

"Available"
ics Condensed Matter
Thursday, November 2, 2017
11:00 AM
Physics Building, Room 313
RESERVED
ics Condensed Matter
Thursday, November 9, 2017
11:00 AM
Physics Building, Room 313
Puru Jena [Host: Utpal Chatterjee]
"TBA"
ics Condensed Matter
Thursday, November 16, 2017
11:00 AM
Physics Building, Room 313
Ilya Vekhter [Host: Utpal Chatterjee]
Louisiana State University
"TBA"
ics Condensed Matter
Thursday, November 30, 2017
11:00 AM
Physics Building, Room 313

"Available"
Condensed Matter Seminars
Utpal Chatterjee (Chair)

To add a speaker, send an email to uc5j@Virginia.EDU Include the seminar type (e.g. Condensed Matter Seminars), date, name of the speaker, title of talk, and an abstract (if available). [Please send a copy of the email to phys-speakers@Virginia.EDU.]