Mixed conductivity in terbia-stabilized bismuth oxide

Vinke, I.C. and Boukamp, B.A. and Vries de, K.J. and Burggraaf, A.J. (1992) Mixed conductivity in terbia-stabilized bismuth oxide. Solid State Ionics, 57 (1-2). pp. 91-98. ISSN 0167-2738

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Abstract:	The mixed conducting solid solution 0.75Bi2O3−0.25Tb4O7 (BT40) was studied by impedance techniques using ionically blocking electrodes. These measurements confirmed the p-type electronic conductivity suggested in literature. In air at temperatures between 600 and 900 K the ionic transference number ranges from 0.28 to 0.70. The total conductivity at 833 K in air is 0.93 Ω−1 m−1. The activation enthalpy for the electronic conductivity varies from 77 kJ/mol in pure O2 to 83 kJ/mol in an ambient with PO2=2×10−4 atm. The electronic conductivity seems to be a function of the sample geometry and increases with decreasing cross section to height ratio. The activation enthalpy for the ionic conductivity being 110 kJ/mol, is independent of the PO2 and does not depend on the sample geometry.
Item Type:	Article
Copyright:	© 1992 Elsevier Science
Research Group:	Inorganic Materials Science (IMS)
Link to this item:	http://purl.utwente.nl/publications/12651
Official URL:	http://dx.doi.org/10.1016/0167-2738(92)90068-Z
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