Stepwise behavior of the mayenite conductivity temperature dependence

Mayenite Ca12Al14O33 +/-delta is an oxide with a complex structure. It possesses outstanding characteristics, namely a wide range of oxygen non-stoichiometry. This feature along with a high deficiency provides oxygen ion transport in oxide. Nevertheless, inferior conductivity hinders its application in solid oxide fuel cells whereas the relatively low cost of its production still makes mayenite competitive if the oxide-ion conductivity value could be optimized. In this study, the doped mayenite was synthesized as well as ceramics based on non-stoichiometric mayenite and single-crystal Ca12Al14O33 +/-delta. The electrical resistance of calcium aluminate derivatives was studied by the alternating current (AC) two-probe impedance method. The temperature dependences of conductivity have a complex step shape for both pristine mayenite and its solid solutions. Results are in good agreement with isotope exchange data and illustrate a general trend in transport properties.

Automated summary

Mayenite Ca12Al14O33 +/-delta is an oxide with a complex structure, wide range of oxygen non-stoichiometry, and high deficiency. However, it has inferior conductivity. In this study, doped mayenite was synthesized and its electrical resistance was studied to explore its conductivity. The results are in good agreement with isotope exchange data and illustrate a general trend in transport properties.