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[Ca 24 Al 28 O 64 ] 4+ (4e − ) are directly and quickly synthesized by self‐reduction of C 12 H 10 Ca 3 O 14 + Al 2 O 3 without any reducing agent
Author(s) -
Xiao Yixin,
Zhang Xin,
Li Rongrong
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17558
Subject(s) - impurity , spark plasma sintering , sintering , microstructure , materials science , analytical chemistry (journal) , cathode , metallurgy , chemistry , organic chemistry , chromatography
C 12 H 10 Ca 3 O 14 + Al 2 O 3 powders are used as precursors, and the dense [Ca 24 Al 28 O 64 ] 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.