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In this paper, we report on the evaluation of the emission uniformity in the emission area of the cathodes by using a Faraday-cup with a probe hole of 20 mum in diameter. In the experiments, the cathodes were operated in pulse mode with the frequency of 100 Hz with pulse width of 250 mus in a vacuum of 10"8 Pa.
In this paper we report the electron emission from sol-gel derived BaTiO3 thin films pretreated in hydrochloric acids. Using a conventional sol-gel technique, we obtained 1 mum thick BaTiO3 ferroelectric thin films onto Ni-Cr substrate. These thin films were pretreated for 45 seconds in concentrated hydrochloric acid (HCl) in order to increase the surface roughness.
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