Ca24Al28O64]4+(4e−) are directly and quickly synthesized by self‐reduction of C12H10Ca3O14 + Al2O3 without any reducing agent

Abstract

AbstractC12H10Ca3O14 + Al2O3 powders are used as precursors, and the dense [Ca24Al28O64]4+(4e−) (C12A7:e−) ceramic block with high electron density is quickly synthesized in one step under a spark plasma sintering (SPS) process with a temperature of 1000°C and a time of 5 minutes. The microstructure and composition analysis results show that the synthesized C12A7:e− is dense (99.7%), has no defects, and no impurities are introduced. The electronic structure analysis results show that the electron concentration of the sample is 2 × 1021 cm−3. This method realizes the self‐reduction of the sample through the CO gas generated during the sintering process, avoids the introduction of impurities, and dramatically simplifies the process. These results provide a potential path for the rapid fabrication of a large number of C12A7:e− with high electron concentration and provide a basis for its practical applications such as cold cathode fluorescent lamp and catalyst carrier.