Intense thermal field electron emission from room-temperature stable electride
Intense thermal field electron emission from room-temperature stable electride
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DOI：
10.1063/1.2149989
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发表时间：
2005-12
影响因子：
4
通讯作者：
Y. Toda;Sung Wng Kim;K. Hayashi;M. Hirano;T. Kamiya;H. Hosono;T. Haraguchi;H. Yasuda
中科院分区：
文献类型：
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作者：
Y. Toda;Sung Wng Kim;K. Hayashi;M. Hirano;T. Kamiya;H. Hosono;T. Haraguchi;H. Yasuda
本文研究了12CaO-∙-7Al_2O_3(C_(12)A_(7))电介质的热场发射，其温度高达90 0℃，外加电压为0-6KV，真空度为10−。当施加105V cm∼1(引出电压为6KV)时，在∼90 0℃时，TFE开始出现，并急剧增加，达到∼80μA(∼1.5Acm−2)。由Richardson-Dushman方程估算的功函数为∼2.1 eV，远小于LaB_6的功函数(∼2.7 eV)。实验证实，电流为∼50μA(直径80μm的区域)的发射可以稳定持续90h以上。在中等真空气氛中，C12A7在相对较低的温度下具有高效稳定的发射，这有力地表明了C12A7电子材料具有很高的TFE应用潜力。
Thermal field emission (TFE) from a flat surface of 12CaO∙7Al2O3 (C12A7) electride was examined at temperatures up to 900°C and applied external voltages of 0–6kV in a 10−5Pa vacuum. TFE started to occur at ∼650°C and steeply increased at ∼900°C to reach ∼80μA (∼1.5Acm−2) when an extraction field of 105Vcm−1 (an extraction voltage of 6kV) was applied. The work function estimated from the Richardson–Dushman equation was ∼2.1eV, which is rather smaller than that of LaB6 (∼2.7eV). It is experimentally confirmed that the emission with a current of ∼50μA (from a 80μm diameter area) was stably sustained for more than 90h. The efficient and stable emission at relatively low temperature in a moderate vacuum atmosphere strongly suggests that the C12A7 electride has high potential for TFE applications.