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Fabrication of room temperature-stable 12CaO · 7Al2O3 electride: a review

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Abstract

12CaO · 7Al2O3 (C12A7) electride, which is synthesized by replacing free oxygen ions in cages with electron anions, has distinct advantages over electrides reported so far in respect of thermal and chemical stability and flexible preparation of various sample forms including single crystal, thin film, polycrystalline bulk and powder. These advantages, together with the fact that the concentration of the electron anions is controlled in a wide range according to a synthetic process, make the C12A7 electride attract growing attentions from both scientific and practical points of views. This paper reviews several chemical and physical synthetic processes of the C12A7 electride including thermal treatment of C12A7 under metal vapor and reducing gas atmospheres, hot Ar+ ion implantation, solidification of the strongly reduced C12A7 melt, and crystallization of the reduced glass in vacuum. Each process, having its own suitability for a specific form of the electride, has unique advantages such as a completeness of anion replacement, mass production capability and controllability of the electron-doped area. Electronic and optical properties of the resulting electrides prepared by the different process are briefly discussed in terms of the feature of the processes.

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Acknowledgements

This work was supported by a Grant-in-Aid for Creative Scientific Research (No. 16GS0205) from the Japanese Ministry of Education, Culture, Sports, Science and Technology

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Authors and Affiliations

  1. Frontier Collaborative Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan

    Sung-Wng Kim, Satoru Matsuishi, Masashi Miyakawa, Katsuro Hayashi, Masahiro Hirano & Hideo Hosono

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  1. Sung-Wng Kim
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  2. Satoru Matsuishi
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  3. Masashi Miyakawa
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  4. Katsuro Hayashi
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  5. Masahiro Hirano
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  6. Hideo Hosono
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Correspondence to Sung-Wng Kim.

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Kim, SW., Matsuishi, S., Miyakawa, M. et al. Fabrication of room temperature-stable 12CaO · 7Al2O3 electride: a review. J Mater Sci: Mater Electron 18 (Suppl 1), 5–14 (2007). https://doi.org/10.1007/s10854-007-9183-y

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  • DOI: https://doi.org/10.1007/s10854-007-9183-y

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