NDLI: Electrical properties of A′Ca$_{2}$Nb$_{3}$O$_{10}$ (A′=K, Rb, Cs) layered perovskite ceramics

Content Provider	Springer Nature Link
Author	Thangadurai, V. Weppner, W.
Copyright Year	2001
Abstract	The electrical conductivity properties of Dion-Jacobson type layered perovskites A′Ca$_{2}$Nb$_{3}$O$_{10}$ (A′=K, Rb, Cs) was investigated under different gas atmospheres. An increase in the electrical conductivity by about 2–5 orders in magnitude in both ammonia and hydrogen atmospheres is observed compared to air. Among the members of the series, the compound with the smallest size of the alkali ion, i.e. KCa$_{2}$Nb$_{3}$O$_{10}$, exhibits the highest conductivity. In air and hydrogen, a single activation energy value in the range 0.25 – 0.80 eV is observed, while in ammonia a sharp increase in the electrical conductivity is found at about 500 °C. The activation energy at low-temperatures (300–500 °C) is attributed to ionic motion and at higher temperatures (500–700 °C) to both defect formation and ionic motion. The unusual electrical conductivity behavior in ammonia is explained on the basis of the model developed for alkali halides. EMF measurements reveal that the layered perovskites are ionic (proton) conductors. The electrical conductivity changes as a function of the ammonia gas concentration; accordingly, layered perovskites appear to be useful solid electrolytes in galvanic cells for practical applications, e.g. for gas sensors.
Starting Page	22
Ending Page	31
Page Count	10
File Format	PDF
ISSN	09477047
Journal	Ionics
Volume Number	7
Issue Number	1-2
e-ISSN	18620760
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biomedicine general Analytical Chemistry Physical Chemistry Electrochemistry Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Engineering Materials Science Chemical Engineering

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