| Effect of Electrode Structures on Electron Emission of the $Pb(Zr_{0.56}Ti_{0.44})O_3$ Ferroelectric Cathode |
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Min-Su Seo, Ki-Min Hong |
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2Chungnam National University |
| $Pb(Zr_{0.56}Ti_{0.44})O_3$ 강유전체 음극의 전극 모형에 따른 전자 방출 특성 |
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서민수, 홍기민 |
1국방과학연구소
2충남대학교 |
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| Abstract |
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Electric-field-induced electron emission from the three kinds of $Pb(Zr_{0.56}Ti_{0.44})O_3$ ferroelectric cathodes with different electrode structure has been investigated. Regardless of the electrode structures, a threshold field of the each cathode was 2.5-2.6kV/mm, which is 3 times higher than the coercive field of $Pb(Zr_{0.56}Ti_{0.44})O_3$ material. Although the waveform of the electron currents was affected by the structure of the electrode, no significant difference for the emission properties such as the peak current and the pulse width was observed from the three kinds of the cathodes. However, the current density of the cathode was dependent on the electrode structure. From the simulation of electric field distribution, the surface flashover, and the injury region of the cathode surface, it was proved that the prime electrons were initiated at the electrode-ceramic-vacuum triple point by field emission and the emission currents were strongly enhanced by the surface plasma. |
| Key Words:
Electron Emission, Ferroelectric Cathode, $Pb(Zr,Ti)O_3$, Electrode Structure, Triple Point, Surface Plasma |
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