Abstract
Ion dynamics in the two-dimensional fluoride ion conductor KSn2F5 have beenstudied by 19Fnuclear magnetic resonance (NMR) and impedance spectroscopy. The electricalrelaxation behaviour of the investigated material is represented in theconductivity and electric modulus formalisms. The values of the dc conductivityand the hopping frequency of mobile ions and their respective activationenergies are estimated from the analysis of the conductivity spectra usingAlmond–West formalism. The activation energies for conduction and ion hoppingprocesses are almost identical, with values of 0.53 and 0.54 eV, respectively,suggesting that the concentration of charge carriers is independent oftemperature. The Roling scaling approach to the conductivity spectra isapplied in order to gain insight into the temperature dependence of therelaxation mechanism. The scaling law successfully collapses the conductivityspectra into a single curve, indicating a temperature-independent relaxationmechanism. Moreover, chemical exchange simulation of the 19FNMR spectra is introduced. The discrepancy between the values of the activationenergies deduced from the electrical and NMR experiments are discussedaccording to Ngai’s coupling model.
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