Journal article

Publication year: 2010

Pages: 1239-1242

Journal: Han'guk-Seramik-Hakhoeji = Journal of the Korean Ceramic Society

Volume number: 47

Issue number: 2

ISSN: 1229-7801

eISSN: 2234-0491

DOI Link: https://doi.org/10.4191/kcers.2010.47.2.099

Publisher: Springer

Abstract: 

The electrical transport properties of mayenite (Ca12Al14O33 or 12CaOcdot7Al2O3; mostly abbreviated as C12A7) can be controlled in a wide range by varying the oxygen deficiency: At high temperatures mayenite becomes either an oxygen solid electrolyte, a mixed ionic/electronic conductor or an inorganic electride with metal-like properties upon chemical reduction (removing oxygen). The underlying defect chemistry can be understood on the basis of a relatively simple model-despite the complex cage structure: A point defect model based on the assumption that the framework [Ca12Al14O32]2+ acts as a pseudo-donor describes well the high temperature transport properties. It accounts for the observed conductivity plateau at higher oxygen activities and also describes the experimentally observed oxygen activity dependence of the electronic conductivity with -1/4 slope at temperatures between 800 and 1000circC. Doping effects in mayenite are still not well explored, and we review briefly the existing data on doping by different elements. Hydration of mayenite plays a crucial role, as Mayenite is hygroscopic, which may be a major obstacle for technical applications.

Harvard Citation style: Janek, J. and Lee, D. (2010) Defect Chemistry of the Mixed Conducting Cage Compound Ca12Al14O33, Han'guk-Seramik-Hakhoeji = Journal of the Korean Ceramic Society, 47(2), pp. 1239-1242. https://doi.org/10.4191/kcers.2010.47.2.099

APA Citation style: Janek, J., & Lee, D. (2010). Defect Chemistry of the Mixed Conducting Cage Compound Ca12Al14O33. Han'guk-Seramik-Hakhoeji = Journal of the Korean Ceramic Society. 47(2), 1239-1242. https://doi.org/10.4191/kcers.2010.47.2.099