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Author Annamareddy, Ajay ♦ Eapen, Jacob
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CALCIUM FLUORIDES ♦ COMPUTERIZED SIMULATION ♦ ELECTRIC CONDUCTORS ♦ IONIC CONDUCTIVITY ♦ MOBILITY ♦ TRANSFER FUNCTIONS ♦ TRANSITION TEMPERATURE ♦ URANIUM DIOXIDE
Abstract In an earlier work [V. A. Annamareddy et al., Phys. Rev. E 89, 010301(R) (2014)], we showed the manifestation of dynamical heterogeneity (DH)—the presence of clustered mobile and immobile regions—in UO{sub 2}, a model type II superionic conductor. In the current work, we demonstrate the mechanism of dynamic facilitation (DF) in two superionic conductors (CaF{sub 2} and UO{sub 2}) using atomistic simulations. Using the mobility transfer function, DF is shown to vary non-monotonically with temperature with the intensity of DF peaking at temperatures close to the superionic transition temperature (T{sub λ}). Both the metrics quantifying DH and DF show remarkable correspondence implying that DF, in the framework of kinematically constrained models, underpins the heterogeneous dynamics in type II superionic conductors.
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-21
Publisher Place United States
Journal Journal of Chemical Physics
Volume Number 143
Issue Number 19


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