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Dubbe, Andreas ; Hagen, Gunter ; Moos, Ralf:
Impedance Spectroscopy of Na+ conducting Zeolite ZSM5.
2005
Veranstaltung: Solid State Ionics 15
, 17.-22.07.2005
, Baden-Baden, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Sonstige
Präsentationstyp)
Abstract
Sodium ion exchanged zeolites, such as Na-ZSM-5, combine both mobile Na+ ions and well-defined gas adsorption/permeation capability in the same material, making them interesting as gas sensitive materials . Several authors measured the impedance of zeolites contacted with metal electrodes, and tentatively assigned a low-frequency “tail” as electrode impedance and a high-frequency semicircle as volume impedance. Generally, both electrode and volume (grain and grain-boundary) contributions might consist of multiple or broad features in the impedance spectrum, overlapping each other over extended frequency regions. The aim of the present investigation is to separate and assign the origins of the relaxation processes in the impedance spectra, especially to find any grain boundary contribution. As a novel approach, electrode impedances of Na-ZSM-5 samples are avoided by contacting them with Na+ conductors in the cell Au|(Na,Ba)CO3|Na-ZSM-5|(Na,Ba)CO3|Au. The impedance of the carbonate/Au interface is relatively low, so that the impedance of the zeolite volume can be calculated accurately from the difference of two measurements with different zeolite thickness.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Sonstige) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien Profilfelder > Advanced Fields > Neue Materialien Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT Profilfelder Profilfelder > Advanced Fields Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 16 Jun 2015 08:51 |
| Letzte Änderung: | 05 Apr 2016 07:08 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/15000 |