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首页> 外文期刊>Physics - Uspekhi >Electron emission from ferroelectric plasma cathodes
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Electron emission from ferroelectric plasma cathodes

机译：铁电等离子体阴极的电子发射

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摘要

Recent and not so recent experimental data are analyzed to show that the reason for strong electron emission from dielectric cathodes is the incomplete discharge occurring on the dielectric surface due to the electric field there being tangentially nonzero. The places of origin of such discharges are the metal - dielectric - vacuum triple junctions (TJs). As the discharge plasma moves over the surface of the dielectric electrode, the bias current arises, and an electric microexplosion occurs at a TJ. If the number of Us is large, as it is for a metal grid held tightly to a ferroelectric, electron currents of up to 104 A with densities of more than 10(2) A cm(-2) can be achieved. A surface discharge is initiated by applying a triggering pulse to the metal substrate deposited beforehand onto the opposite side of the ferroelectric. If this pulse leads the accelerating voltage pulse, the electron current is many times the Child - Langmuir current. The reason for the ferroelectric effect is the large permittivity (epsilon > 10(3)) of the materials used (BaTiO3, PLZT, PZT). Although these devices have come to be known as ferroelectric cathodes, we believe ferroelectric plasma cathodes would be a better term to use to emphasize the key role of plasma effects.
机译：分析了最近而不是最近的实验数据，以表明从电介质阴极发出强电子的原因是由于电场切向不为零，所以在电介质表面上发生了不完全放电。这种放电的起源是金属-电介质-真空三重结（TJ）。当放电等离子体在介电电极表面上移动时，会产生偏置电流，并且在TJ处会发生微爆炸。如果Us的数量很大，就如同将金属栅紧紧地固定在铁电体上一样，可以实现密度高达10（2）A cm（-2）的高达104 A的电子电流。通过向预先沉积在铁电体的相对侧上的金属基板施加触发脉冲来启动表面放电。如果此脉冲超前于加速电压脉冲，则电子电流将是Child-Langmuir电流的许多倍。铁电效应的原因是所用材料（BaTiO3，PLZT，PZT）的介电常数大（ε> 10（3））。尽管这些设备已被称为铁电阴极，但我们相信铁电等离子体阴极将是强调等离子体效应的关键作用的更好术语。

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