Author： Kobayashi T. Morishita S. Honma T. Abe K. Ukyo Y. Iwahara H.
Publisher： Springer Publishing Company
ISSN： 0022-2461
Source： Journal of Materials Science, Vol.35, Iss.21, 2000-11, pp. : 5283-5289
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Abstract
The stability of the SrZr_0.9Yb_0.1O_3−α protonic conductor in an atmosphere containing nitrogen oxides (NO_x) was investigated. When a fine powder of SrZr_0.9Yb_0.1O_3−α with a specific surface area of about 50 m^2/g was annealed at 440 °C in He gas containing 8% O_2 and 0.1% NO, the formation of Sr(NO_3)_2 was observed by IR measurement, ion-chromatography analysis and ICP analysis. The formation mechanism of Sr(NO_3)_2 was examined by considering the thermodynamic equilibrium. Based on the results of the thermodynamic calculation, H_2O dissolved into SrZr_0.9Yb_0.1O_3−α was estimated to play an important role in the reaction for the formation of Sr(NO_3)_2 between SrZr_0.9Yb_0.1O_3−α and NO_x.
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