Tomo-o Satô, Hideo Kaneko and Katashi Masumoto
The main causes of the aging of selenium rectifier are the change of electrical resistance of blocking layer and that of selenium layer. To make clear the phenomenon based on the later cause and to supply some fundamental data for the prevention of aging of the rectifier, the present authors have measured the change of the electrical resistance of selenium layer when it is heated under various conditions. The results obtained are as follows: the electrical resistance of selenium containing chlorine or bromine increases rapidly for the first few days of the aging period and thereafter shows constant resistance, while that of selenium containing iodine increases slowly during all period. Under the condition of high temperature and humidity, the increase of resistance is comparatively large. Considering the character of the rectifying plate from the stand point of electrical conductivity, therefore, selenium containing chlorine gives the best result, but from the stand point of aging, it is considered that selenium containing iodine is the most stable.
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