Abstract
Abstract Experimental results obtained on oxide-coated cathodes, subjected to various temperature conditions and not supplying emission current, are given in support of the theory that a layer of barium exists at the outer surface of the oxide giving the enhanced emission. The existence of an equilibrium value of emission, and, therefore, of amount of surface covered with active material, for various temperatures is demonstrated. Data are also presented on ageing of such cathodes and the loss of activity that occurs on flashing at higher temperatures than normal.
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