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Atomistic interpretation of the ac-dc crossover frequency in crystalline and glassy ionic conductors
M A T Marple1, H Avila-Paredes2, S Kim1
1Department of Materials Science and Engineering, University of California, Davis, California 95616, USA.
Abstract:
A comprehensive analysis of the ionic dynamics in a wide variety of crystalline and glassy ionic conductors, obtained in recent studies using a combination of electrochemical impedance and nuclear magnetic resonance spectroscopic techniques, is presented. These results demonstrate that the crossover frequency, between the frequency-independent dc conductivity and the frequency-dependent ac conductivity, corresponds to the time scale of "successful" diffusive hops of the mobile ions between the trapping sites in the structure. These inter-site hops are typically compound in nature and consist of several elementary hops in the intervening region between the neighboring trapping sites.
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