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Variations in ionic conductivity of calcium-doped barium cerate ceramic electrolytes in different atmospheres

✍ Scribed by Sara D Flint; Robert C.T Slade

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 617 KB
Volume: 97
Category: Article
ISSN: 0167-2738
DOI: 10.1016/s0167-2738(97)00035-0

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✦ Synopsis

Electrical conduction in sintered BaCe Ca O has been investigated at high temperatures (300 , T / 8C , 1000) in 0.95 0.05 2.95 moist N , O and H atmospheres via ac impedance spectroscopy. Conduction arises from charge carriers which participate 2 2 2

in equilibria with the various atmospheres. At low temperatures (T , 4808C), the conductivity is the same in all atmospheres, protons generated by reaction with water being the dominant charge carriers. At higher temperatures, conductivity is higher in hydrogen than in nitrogen, additional protons being generated by reaction of H with positive holes. In oxygen the 2 material functions as a mixed (oxide 1 proton 1 electron) conductor at high temperatures.

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