Accelerated life ac conductivity measurements of CRT oxide cathodes

HASHIM, A. A., BARRATT, D. S., HASSAN, A. K. and NABOK, A. V. (2006). Accelerated life ac conductivity measurements of CRT oxide cathodes. Applied Surface Science, 252 (18), 6332-6336.

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The ac conductivity measurements have been carried out for the activated Ba/SrO cathode with additional 5% Ni powder for every 100 h acceleration life time at the temperature around 1125 K. The ac conductivity was studied as a function of temperature in the range 300-1200 K after conversion and activation of the cathode at 1200 K for 1 h in two cathodes face to face closed configuration. The experimental results prove that the hopping conductivity dominate in the temperature range 625770 K through the traps of the WO3 associate with activation energy E-a = 0.87 eV, whereas from 500-625 K it is most likely to be through the traps of the Al2O3 with activation energy of E-a = 1.05 eV. The hopping conductivity at the low temperature range 300-500 K is based on Ni powder link with some Ba contaminants in the oxide layer stricture which indicates very low activation energy E-a = 0.06 eV (c) 2005 Elsevier B.V. All rights reserved.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:
Page Range: 6332-6336
Depositing User: Ann Betterton
Date Deposited: 20 Apr 2010 15:04
Last Modified: 18 Mar 2021 21:30

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