caa a22 4500 463223322 CHVBK 20180405153219.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-0348-5 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0348-5 Ionic transport and localized ionic motion in Na- β ′′-alumina, Na1.70Li0.32Al10.66O17 [Elektronische Daten] [Klaus Funke, Radha Banhatti] Frequency-dependent conductivities of the two-dimensional sodium-ion conductor Na-β′′-alumina, of composition Na1.70Li0.32Al10.66O17, have been taken between 100MHz and several THz, at different temperatures. In their low-frequency sections, the spectra are affected by the polycrystallinity of the sample, i.e. by inter-grain polarization, while the vibrational component prevails in the far infrared. In a first step, these two contributions are identified and removed from the spectra. In a second step, the remaining frequency-dependent conductivities are explained in terms of the displacive movements performed by the sodium ions within the crystal volume. Here, two kinds of motion are distinguished. One is translational via vacant local residence regimes, establishing macroscopic transport. The other is localized within a residence regime. The experimental conductivities are well reproduced by model spectra. The values of the parameters used agree with the available structural information. Springer Science+Business Media, LLC, 2007 Funke Klaus Institute of Physical Chemistry and Sonderforschungsbereich 458, University of Münster, Corrensstrasse 30, 48149, Munster, Germany aut Banhatti Radha Institute of Physical Chemistry and Sonderforschungsbereich 458, University of Münster, Corrensstrasse 30, 48149, Munster, Germany aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 1942-1947 0022-2461 42:6<1942 2007 42 10853 https://doi.org/10.1007/s10853-006-0348-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0348-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Funke Klaus Institute of Physical Chemistry and Sonderforschungsbereich 458, University of Münster, Corrensstrasse 30, 48149, Munster, Germany aut NATIONALLICENCE 700 1- Banhatti Radha Institute of Physical Chemistry and Sonderforschungsbereich 458, University of Münster, Corrensstrasse 30, 48149, Munster, Germany aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 1942-1947 0022-2461 42:6<1942 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer