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

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.363876· OSTI ID:450239

Benedek, G; Boscolo, I ^[1]; Handerek, J ^[2]; Riege, H ^[3]

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1. University, INFN and INFM, Milan (Italy)
2. University of Silesia, Katowice (Poland)
3. CERN AT-Division, CH-1211 Geneve (Switzerland)

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{degree}C. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 450239
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 3 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANTIFERROELECTRIC MATERIALS
CATHODES
CERAMICS
ELECTRON EMISSION
ELECTRON SOURCES
FIELD EMISSION
PIEZOELECTRICITY
PLASMA
PULSES
PZT
electric domains
ferroelectric switching