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High-current-density electron emission from lead zirconium titanate ferroelectric disc under application of short-duration high-voltage pulses

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3 Author(s)
Moorti, A. ; Center for Adv. Technol., Laser Plasma Div., Indore, India ; Naik, P.A. ; Gupta, P.D.

High-current-density pulsed-electron emission is observed from a poled lead zirconium titanate (PZT, Zr/Ti:53/47) ferroelectric ceramic disc on application of short-duration (∼6 ns) negative high-voltage (∼4 kV) pulses. Electron-emission pulses with a peak current density ∼400--450 A/cm2 and a full-width at half-maximum (FWHM) duration of ∼200--250 ns were recorded in the presence of a dc extraction field. These are comparable to the various earlier results obtained using excitation pulses of duration comparable to the polarization switching time (≥100 ns). Self-emission of electrons with a current density of ∼20--30 A/cm2 was also observed. The experimental observations indicate occurrence of partial polarization reversal in the ferroelectric sample followed by plasma formation on the surface.

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Plasma Science, IEEE Transactions on  (Volume:32 ,  Issue: 1 )