Transport and Relaxation in Ionic Crystals

The charge transfer across the interface superconductor/ionic conductor represents a relatively unknown field at present. This paper deals with the first electrochemical studies in this area. Both n‐type classical and p‐ and n‐type high Tc superconductors (HTSC) are considered. Different superionic conductors (Ag β‐alumina, Ag + ion conducting glass, and RbAg4I5) are used as solid electrolytes in experiments covering a temperature range down to 10 K. A transient technique in the time domain and Electrochemical Impedance Spectroscopy (EIS) in the frequency domain are used to study the silver deposition as Faradaic charge transfer process at these interfaces. The results show an admittance peak in transient measurements or a corresponding negative peak of the polarization resistance in EIS‐measurements at T ≈ Tc. These findings are attributed to an increase of the exchange current density around Tc. The effect is much less on an A15 compound than on HTSCs. The effect can only be interpreted as a quantumelectrochemical phenomenon caused by the contribution of Cooper pairs as correlated charge carriers crossing the electrochemical double layer. A proximity‐like phenomenon can be excluded.

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Search for Quasielastic Neutron Scattering Components Due to Jump Relaxation in Glass

Cramer

Funke

Vortkamp

et al. 1991

Ber Bunsenges Phys Chem

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A lithium bromide doped lithium borate glass has been studied by neutron scattering experiments and by measurement of the dynamic conductivity. Whereas the dispersion of the dynamic conductivity at lower frequencies can be interpreted in terms of a non‐Debye jump relaxation model, a quasielastic neutron scattering component, as predicted by the model, could not be resolved. However, in some other glassy systems there is evidence of quasielastic components due to jump relaxation processes. This is shown for two examples: the glass forming melt 3KNO3 · 2Ca(NO3)2 and an AgI · AgPO3 glass.

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Transport and Relaxation in Ionic Crystals

Cited by 16 publications

References 26 publications

Appendix: Experimental Methods for In‐situ Investigations

Appendix: Experimental Methods for In‐situ Investigations

The Superconductor/Ionic Conductor Interface at Low Temperatures

Search for Quasielastic Neutron Scattering Components Due to Jump Relaxation in Glass

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