期刊
PHILOSOPHICAL MAGAZINE
卷 92, 期 19-21, 页码 2596-2628出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2012.685770
关键词
12CaO center dot 7Al(2)O(3); electride; single crystal; thin film
类别
资金
- Japan Society for the Promotion of Science
- MEXT, Japan
Over the last decade, experimental studies supported by theoretical calculations have demonstrated that 12CaO center dot 7Al(2)O(3) (C12A7), a typical electrical insulator, could be converted into an electro-active functional material, such as a metallic conductor with a low work function but chemical inertness and superconductivity, at low temperatures. These properties were realised by successful heavy electron doping into positively charged sub-nanometre-sized cages inherent to the crystal structure through removal of oxygen ions accommodated in the cages. The resulting samples, C12A7:e(-), may be regarded as an electride in which electrons serve as anions. This article reviews the single crystal and thin film growth of both C12A7 and C12A7:e(-), and describes our approach to these subjects on the basis of understanding the phase diagram of C12A7 and C12A7:e(-) as well as their molten and glassy states. Finally, the importance of the surface of C12A7:e(-) is addressed with regard to practical applications.
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