Defect Chemistry of the Mixed Conducting Cage Compound Ca₁₂Al₁₄O₃₃

摘要: The electrical transport properties of mayenite (Ca₁₂Al₁₄O₃₃ or 12CaO·7Al2O3; mostly abbreviated as C₁₂A?) can be controlled in a wide range by varying the oxygen deficiency: At high temperatures becomes either an solid electrolyte, mixed ionic/electronic conductor inorganic electride with metal-like upon chemical reduction (removing oxygen). underlying defect chemistry understood on basis relatively simple model ? despite complex cage structure: A point based assumption that framework [a₁₂Al₁₄O₃₂]²? acts pseudo-donor describes well temperature properties. It accounts for observed conductivity plateau at higher activities and also experimentally activity dependence electronic ?1/4 slope between 800 1000℃. Doping effects are still not explored, we review briefly existing data doping different elements. Hydration plays crucial role, Mayenite is hygroscopic, which may major obstacle technical applications.