Electron emission from ferroelectric materials
Electron emission from ferroelectric materials
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铁电材料的电子发射
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
I. Rez
中科院分区：
文献类型：
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作者：
G. Rosenman;I. Rez
铁电材料是一类新型的电子发射体。电子发射是由于在热释电、压电和反常光伏效应以及自发极化逆转过程中，这些晶体的极性表面出现未屏蔽的电荷和静电场而发生的。微小的外部扰动（例如，几度或更小的温度变化）足以使这种发射效应发生。发射电流密度可达103 A cm−2，电子能量可达105 eV左右。结果表明，这种现象与其他类型的电子发射有很大的不同。讨论了这种效应的物理性质。
Ferroelectric materials are a new class of electron emitters. Electron emission occurs due to the appearance of an unscreened charge and an electrostatic field at the polar surfaces of these crystals under pyroelectric, piezoelectric, and anomalous photovoltaic effects as well as during spontaneous polarization reversal. Small external perturbation (for example, a temperature variation of a few degrees or less) is enough for this emission effect to occur. Emission current density up to 103 A cm−2 and electron energy up to about 105 eV have been reported. It is shown that this phenomenon drastically differs from other kinds of electron emissions. The physical nature of this effect is discussed.