Abstract
The purpose of this paper is to summarize the results on the phase relations and nonstoichiometry in V2O5- x , BaBiO3-x and PrO x investigated by the present authors. The equilibrium oxygen partial pressures over the above oxides have been measured by coulometric titration using yttria-stabilized zirconia as a solid electrolyte. Nonstoichiometry in these oxides has been determined as a function of the oxygen partial pressure. The maximum oxygen deficiency in V2O5- x is 0.055 at 920K. The BaBiO3-x has three distinct phases in 0<x<0.5. The existence of the PrO1.667 is suggested in the PrO x . Detailed discussions have been made on the defect structures of the nonstoichiometric oxides based on the relation between the deviation from the stoichiometric composition and the oxygen partial pressure. The results prove that coulometric titration is one of the powerful tool to study the phase relation particularly in the oxides with the small deviation from the stoichiometric dcomposition.
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Saito, Y., Maruyama, T. (1989). Phase Relations of Metal Oxides by Coulometric Titration. In: Nowotny, J., Weppner, W. (eds) Non-Stoichiometric Compounds. NATO ASI Series, vol 276. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0943-4_2
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DOI: https://doi.org/10.1007/978-94-009-0943-4_2
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