定向凝固LaB6 VB2 Eu 3+的Work Function表征
Work Function Characterization of the Directionally Solidified LaB6 VB2 Eutectic
摘要：
LaB_6/VB_2共晶系统具有低功函数和高机械强度的特点，是高性能电子发射极的理想材料。对于器件应用的开发，重要的是要了解该系统中功函数的起源、值和空间分布。在这里，我们结合热发射电子显微镜和低能量电子显微镜与俄歇电子能谱和物理气相沉积的组成元素，探索物理和化学条件下，这些表面的功函数。我们的研究结果包括观察到的功函数是较低的（和发射强度较高）VB 2夹杂物比LaB 6矩阵。我们还观察到，原子单层剂量的钒的沉积结果在令人惊讶的显着降低的功函数的值低至1.1 eV。
英文摘要：
With its low work function and high mechanical strength, the LaB6/VB2 eutectic system is an interesting candidate for high performance thermionic emitters. For the development of device applications, it is important to understand the origin, value, and spatial distribution of the work function in this system. Here we combine thermal emission electron microscopy and low energy electron microscopy with Auger electron spectroscopy and physical vapour deposition of the constituent elements to explore physical and chemical conditions governing the work function of these surfaces. Our results include the observation that work function is lower (and emission intensity is higher) on VB2 inclusions than on the LaB6 matrix. We also observe that the deposition of atomic monolayer doses of vanadium results in surprisingly significant lowering of the work function with values as low as 1.1 eV.
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