Electron emission from ferroelectric/antiferroelectric cathodes excited by short high-voltage pulses

被引:51
作者
Benedek, G
Boscolo, I
Handerek, J
Riege, H
机构
[1] UNIV MILAN,INFM,MILAN,ITALY
[2] SILESIA UNIV,KATOWICE,POLAND
[3] CERN,DIV AT,CH-1211 GENEVA,SWITZERLAND
关键词
D O I
10.1063/1.363876
中图分类号
O59 [应用物理学];
学科分类号
摘要
Un-prepoled lead zirconate titanate lanthanum doped-PLZT ferroelectric cathodes have emitted intense current pulses under the action of a high voltage pulse of typically 8 kV/cm for PLZT of 8/65/35 composition and 25 kV/cm for PLZT of 4/95/5 composition. In the experiments described in this paper, the exciting electric field applied to the sample is directed from the rear surface towards the emitting surface. The resulting emission is due to an initial field emission from the metal of the grid deposited over the emitting surface with the consequent plasma formation and the switching of ferroelectric domains. These electrons may be emitted directly form the crystal or from the plasma. This emission requires the material in ferroelectric phase. In fact, PLZT cathodes of the 8/65/35 type, that is with high titanium content, showing ferroelectric-paraelectric phase sequence, emit at room temperature, while PLZT cathodes of the 4/95/5 type, with low titanium content, having antiferro-ferro-paraelectric phase sequence, emit strongly at a temperature higher than 130 degrees C. (C) 1997 American Institute of Physics.
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页码:1396 / 1403
页数:8
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