Evaporation of Barium from Cathodes Impregnated with Barium–Calcium–Aluminate
- 1 February 1959
- journal article
- research article
- Published by Taylor & Francis in Journal of Electronics and Control
- Vol. 6 (2) , 149-161
- https://doi.org/10.1080/00207215908937137
Abstract
The evaporation of barium from cathodes impregnated with barium-calcium-aluminate, 3BaO. Al2O3½CaO has been observed during the life of cathodes made with various thicknesses of two types of porous tungsten. The slow decay observed in thin cathodes of very porous tungsten appears to be duo mainly to the reaction producing barium being retarded by the reaction products accumulating at the interface between the tungsten and the impregnant. The more rapid decrease for thick cathodes of lower porosity is due to the escape of barium becoming the limiting factor. This results in the reaction going to completion at increasingly greater depths within the cathode during life. The transport of barium to the surface of the cathode appears to be mainly by migration along the crystal boundaries in the impregnant and reaction products.Keywords
This publication has 3 references indexed in Scilit:
- On the Mechanism of Operation of the Barium Aluminate Impregnated CathodeJournal of Applied Physics, 1957
- Studies on the Mechanism of Operation of the L Cathode. IIJournal of Applied Physics, 1957
- III. The, Evaporation of Barium from ’ L ’ CathodesJournal of Electronics and Control, 1956