Thermal field emission observation of single-crystal LaB6
Thermal field emission observation of single-crystal LaB6
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DOI：
10.1063/1.346322
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发表时间：
1990-10
影响因子：
3.2
通讯作者：
H. Nagata;K. Harada;R. Shimizu
中科院分区：
文献类型：
--
作者：
H. Nagata;K. Harada;R. Shimizu
通过发射谱观察，研究了LaB6<100>和<310>单晶的热场发射特性。研究发现，当尖端温度保持在∼1500C时，场蒸发对获得四重对称的清洁花样非常有利。清洁图案中的四个亮点中的每一个都被假定对应于<310>发射。提出了<310>LaB6针尖在10∼9Torr区真空度为10−，温度为1000℃时的最佳工作条件，为实际应用提供了一种高亮度、高稳定性的新型TF发射体。
TFE (thermal field emission) properties of LaB6 〈100〉 and 〈310〉 single crystals were investigated by emission pattern observation. It was found that field evaporation with the tip temperature held at ∼1500 °C is very useful to get a clean pattern of fourfold symmetry. Each of four bright spots in the clean pattern was presumed to correspond to 〈310〉 emission. It is proposed, as the most appropriate operating condition, to use the 〈310〉LaB6 tip at a temperature ∼1000 °C in vacuum of 10−9 Torr region, promising a new TF emitter of high brightness and stability for practical use.