Resistivity relaxation, a new approach to study ionic mobility in perovskite mixed conductors like CaTi0.7Fe0.3O3-ð

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Mashkina E, Baier M, Magerl A, Göbbels M, Seifert F
Zeitschrift: Ionics
Verlag: Springer Verlag (Germany)
Jahr der Veröffentlichung: 2005
Band: 11
Seitenbereich: 269-274
ISSN: 0947-7047
Sprache: Englisch


Abstract


Oxygen transport of mixed ionic-electronic conductors can be measured by a 'relaxation' technique that permits to investigate the material dynamic properties with oxygen partial pressure change. However, for materials exhibiting higher electronic conductivity than ionic, the time for conductivity change is controlled by bulk ionic transport and any surface reaction can be neglected. By fitting the experimental relaxation data of CaTi 0.7Fe0.3O3-δ composition, the oxidation and reduction kinetics was found to be independent on oxygen partial pressure (PO2) and the rate constants were derived therefrom. From a relaxation experiment at a single PO2 we therefore obtain both the electronic and ionic contributions to the total conductivity as well as the chemical diffusion coefficient.



FAU-Autoren / FAU-Herausgeber

Göbbels, Matthias Prof. Dr.
Lehrstuhl für Mineralogie
Magerl, Andreas Prof. Dr.
Lehrstuhl für Kristallographie und Strukturphysik


Autor(en) der externen Einrichtung(en)
Universität Bayreuth


Zitierweisen

APA:
Mashkina, E., Baier, M., Magerl, A., Göbbels, M., & Seifert, F. (2005). Resistivity relaxation, a new approach to study ionic mobility in perovskite mixed conductors like CaTi0.7Fe0.3O3-ð. Ionics, 11, 269-274.

MLA:
Mashkina, Elena, et al. "Resistivity relaxation, a new approach to study ionic mobility in perovskite mixed conductors like CaTi0.7Fe0.3O3-ð." Ionics 11 (2005): 269-274.

BibTeX: 

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