Electrical conduction in CaO-doped thoria electrolytes

Maiti, H. S. ; Subbarao, E. C. (1976) Electrical conduction in CaO-doped thoria electrolytes Journal of the Electrochemical Society, 123 (11). pp. 1713-1718. ISSN 0013-4651

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Related URL: http://dx.doi.org/10.1149/1.2132675


The electrical conductivity of sintered specimens of nominally pure thoriaand thoria doped with 1-15 mole percent (m/o) CaO was measured between 600° and 1400° C in the pO2 range of 1-10−25 atm. The measured conductivitydecreases initially with decreasing pO2(mixed conduction region where electronholes and oxygen ions contribute), until it becomes independent of pO2(ionic conduction region). The pO2 corresponding to the transition betweenthese regions is a function of temperature and composition. The variation ofconductivity with temperature gives rise to three regions: the high temperatureregion where the conductivity is attributed to dissociated vacancies, anintermediate temperature range where associated vacancy-impurity complexesdominate, and a low temperature region where grain boundary effects appearto become significant. The activation energy for electrical conduction is afunction of composition and pO2.

Item Type:Article
Source:Copyright of this article belongs to The Electrochemical Society.
Keywords:Solid Electrolytes; Thorium Compounds; Calcium Compounds; Oxygen Compounds; Ionic Conductivity; Mixed Conductivity; High-temperature Effects; Vacancies (crystal); Impurity-defect Interactions; Grain Boundaries
ID Code:50457
Deposited On:25 Jul 2011 10:35
Last Modified:25 Jul 2011 10:35

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