[Ca24Al28O64]4+(4e−) are directly and quickly synthesized by self‐reduction of C12H10Ca3O14 + Al2O3 without any reducing agent. Issue 4 (20th November 2020)

• Record Type: Journal Article
• Authors: Xiao, Yixin; Zhang, Xin; Li, Rongrong
• Is Part Of: Journal of the American Ceramic Society. Volume 104:Issue 4(2021)
• Page Start: 1641
• Page End: 1648
• Publication Date: 2020-11-20
• Subjects: C12A7:e− -- rapid synthesis -- SPS; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.17558
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: C12 H10 Ca3 O14 + Al2 O3 powders are used as precursors, and the dense [Ca24 Al28 O64 ] 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 × 10 21 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.