Diffusion in confinement as a microscopic relaxation mechanism in glass-forming liquids

Journal Article · Sat Dec 31 23:00:00 EST 2011 · Chemical Physics Letters

DOI:https://doi.org/10.1016/j.cplett.2012.01.073· OSTI ID:1039963

Mamontov, Eugene ^[1]

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1. ORNL

Using quasielastic neutron scattering, we compare dynamics in single-element liquids, glass-forming selenium and non glass-forming gallium. There is a single jump-diffusion process in gallium, whereas in selenium there is also a faster, spatially localized process. The fast and slow processes describe {beta}- and {alpha}-relaxation, respectively. We then analyze an archetypical glass-former, glycerol, to show that the two-component fit, with {beta}- and {alpha}-relaxations explicitly separated, yields the correct value for the translational diffusion coefficient and provides information on the spatial localization of the {beta}-relaxation that is not experimentally accessible otherwise.

• Research Organization: Oak Ridge National Laboratory (ORNL); Spallation Neutron Source
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1039963
• Journal Information: Chemical Physics Letters, Journal Name: Chemical Physics Letters Vol. 530; ISSN CHPLBC; ISSN 0009-2614
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CONFINEMENT
DIFFUSION
GALLIUM
GLYCEROL
NEUTRONS
RELAXATION
SCATTERING
SELENIUM