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2017 ; 7
(ä): 44149
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Low Dimensional String-like Relaxation Underpins Superionic Conduction in
Fluorites and Related Structures
#MMPMID28344314
Annamareddy A
; Eapen J
Sci Rep
2017[Mar]; 7
(ä): 44149
PMID28344314
show ga
Among the superionic conductors that show a Faraday transition - the continuous
increase in the ionic conductivity over a range of temperatures - the fluorite
structures have enjoyed incisive examinations over the past four decades; yet the
fundamental nature of superionicity has remained largely inconclusive. Departing
from the traditional quasi-static defect framework, we provide weighty evidence
for string-like dynamical structures that govern the fast ion conduction process
in fluorites. We show that lower temperatures encourage the growth of longer but
slowly relaxing strings and vice-versa - a direct manifestation of heterogeneous
dynamics. Remarkably, the ionic conductivity is inversely correlated to the
lifetime of the ions that participate in the strings and not explicitly to the
ion population. Our analysis methodology, which resolves a long-standing
disagreement on defect structures and the mechanism of ionic transport in fcc
fluorite structures, is well-positioned to describe the dynamics of low
dimensional conduction in a larger class of superionic conductors.