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Materie unter extremen Bedingungen Poster: Do., 13:00–15:30 D-P364
Inelastic neutron scattering on levitated liquid droplets
Andreas Meyer 1 , Sebastian Stüber 1 , Dirk Holland-Moritz 2 , Oliver
Heinen 2 , Tobias Unruh 3
1 Deutsches Zentrum für Luft und Raumfahrt, Institut für Raumsimulation, 51170
Köln – 2 Institut für Raumsimulation, DLR, 51170 Köln – 3 Heinz Maier-Leibnitz
Forschungsneutronenquelle, FRM-II, TU München, 85747 Garching
Conventional neutron scattering experiments on metallic liquids are restricted to samples
with a melting temperature that is well below 2000 K and that do not react with
their sample holders made of e.g. alumina or SiC. We succeeded to process liquid
droplets of 6-8 mm in diameter in an electromagnetic levitation device on the neutron
time-of-flight spectrometer ToF-ToF of the FRM-II. This containerless processing of
the samples not only gives access to experiments on high temperature and chemically
reactive liquids, but also allows for undercooling the samples several 100 K below their
liquidus. In addition, spectra at large q values can be measured with high accuracy
that are otherwise dominated by Bragg scattering of the sample holders. We report on
quasielastic neutron scattering experiments on liquid Ni as well as Ni and Zr rich alloys.
More than 200 K undercooling and the resulting slowing down of dynamics allowed
for a stringent test of theoretical descriptions of liquid dynamics in these systems.