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七铝酸十二钙电子化合物单晶的电输运及电子发射性能
作者:赵吉平1  忻1 刘洪亮1 肖怡新1  浩1 张久兴1 2 
单位:(1. 北京工业大学材料科学与工程学院 新型功能材料教育部重点实验室 北京 100124  2. 合肥工业大学材料科学与工程学院 合肥 230009) 
关键词:七铝酸十二钙化合物 单晶体 电输运 热发射 
分类号:O462.1
出版年,卷(期):页码:2019,47(1):0-0
DOI:10.14062/j.issn.0454-5648.2019.01.04
摘要:

 采用放电等离子烧结–光学悬浮区域熔炼–高温活性金属Ti还原相结合的制备方法成功获得了[Ca24Al28O64]4+:4e?(C12A7:e?)单晶体。测试了C12A7:e?的电子浓度,在800~1 100 ℃温度范围内测试了C12A7:e?单晶体自由生长面的热电子发射性能。结果表明:以活性金属 Ti 作为还原剂,在1 100 ℃还原30 h后,获得了接近理论电子浓度最大值(2.1×1021 cm?3)的C12A7:e?单晶,室温下的电导率达到 1.96×103 S/cm。在1 100 ℃,电压为3.5 kV时,发射电流密度达到最大值1.25 A/cm2,平均有效逸出功为 1.81 eV,表现出良好的热发射性能。

 A single crystal of [Ca24Al28O64]4+:4e? (C12A7:e?) was prepared via a spark plasma sintering (SPS)–floating zone (Fz)–Ti metal reduction method. The electron concentration of C12A7:e? was measured and its thermionic emission properties of free growth surface at 800?1 100 ℃ were also investigated. The results show that after the reduction treatment with Ti metal at 1 100 ℃ for 30 h, a C12A7:e? single crystal with a theoretical maximum electron concentration (2.1×1021 cm?3) is obtained, and the electrical conductivity at room temperature is 1.96×103 S/cm. The emission current density reaches a maximum value of 1.25 A/cm2 at 1 100 ℃ with a voltage of 3.5 kV. The average effective work function is 1.81 eV, showing a good thermionic emission performance.

基金项目:
国家自然科学基金项目(51371010)
作者简介:
参考文献:

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