Electron Emission from Barium Strontium Titanate Ceramics

Abstract

This paper focuses on understanding the influence of materials' properties on the ferroelectric electron emission. Ferroelectric (x=1.0 and 0.8) and paraelectric (x=0.67 and 0.5) compositions of barium strontium titanate (BaxSr(1−x)TiO3) system were chosen for study based on their different ferroelectric and dielectric properties. Similar emission current waveforms were obtained from four compositions with negative triggering voltage applied to the rear electrode of the samples. It was difficult to explain the experimental results using the spontaneous polarization‐switching model. The mechanism of electron emission from BaxSr(1−x)TiO3 ceramics was ascertained to surface plasma emission.

Peculiarity of Low Density Plasma-Assisted Charge Emission Produced at LATGS Crystal Surface

“…About twenty years later, electron current with density of the order of a few Acm −2 was produced on PLZT ceramic samples subjected to the short (10 −7 s) negative HV pulse (Gundel et al [12]). During the last two decades, mainly PZT-and BaTiO 3 -based ceramic samples with selected composition and polarization state [13][14][15][16][17][18][19][20][21], and even TGS single crystals [22] were examined under different experimental conditions because of their possible application as cold cathodes in different areas of technology, for example in vacuum electronics, accelerators, plasma sources, lasers, triggering systems, etc. It should be stated that for the most of strong electron emission experiments, the sample studied were subjected to the pulse (10 −7 − 10 −6 s) electric field exceeding 10 4 V/cm and only in some experiments the pulse duration was as long as 10 −3 s [22].…”