Simple and efficient fabrication of room temperature stable electride: Melt-solidification and glass ceramics
Simple and efficient fabrication of room temperature stable electride: Melt-solidification and glass ceramics
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DOI：
10.1021/ja043990n
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发表时间：
2005-02-09
影响因子：
15
通讯作者：
Hosono, H
中科院分区：
文献类型：
--
作者：
Kim, SW;Miyakawa, M;Hosono, H
电子化合物是离子化合物，其中电子充当阴离子。这些化合物由于其奇特的结构预计将具有有趣的特性。通过使用具有纳米多孔结构的单晶12CaO·7Al2O3(C12A7)合成室温(RT)稳定的电子化合物并进行长时间的化学处理，解决了有机电子化合物热和化学不稳定性的致命缺点。然而，冷电子发射器和热电子器件等实际应用显然需要一种创新的制造方法。在此，我们报告了一种通过强还原性 C12A7“熔体”（即熔体直接凝固或透明玻璃结晶）来简单合成具有中等电子电导率的多晶 C12A7 电子化合物。强还原熔体和玻璃中载流子电子的产生和 C12A7 相的沉淀可能与碳相关阴离子的掺入有关，以稳定 C12A7 相并保持 C12A7 中的移动电子。这些发现将广泛用于所需形状和尺寸的大规模生产应用，从而促进电子化合物的研究。
Electrides are ionic compounds in which electrons act as anions. These compounds are expected to have interesting properties arising from their exotic structure. The fatal drawbacks of the thermal and chemical instability of organic electrides were resolved by the synthesis of a room temperature (RT) stable electride using single crystalline 12CaO·7Al2O3(C12A7) with a nanoporous structure and the chemical treatments for a long duration. However, an innovative fabrication method is obviously required for practical applications such as cold electron-emitter and thermionic devices. Herein we report a simple synthesis for polycrystalline C12A7 electrides with a moderate electronic conductivity via a strongly reducing C12A7 “melt”, i.e., direct solidification of the melt or crystallization of the transparent glass. Generation of carrier electrons and precipitation of the C12A7 phase from the strongly reducing melt and glass are likely associated with the incorporation of carbon-related anions for stabilizing the C12A7 phase and keeping the mobile electrons in C12A7. These findings will be broadly utilized for applications by mass production in a desired shape and dimension, facilitating the research of electrides.