Ni-MgおよびNi-Mg-W陰極基体金属のMgの拡散，中間層ならびに電子放射

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  • Diffusion of Magnesium, Interface Layer and Electron Emission of Ni-Mg and Ni-Mg-W Cathode-Base Metals
  • Ni-Mg オヨビ Ni-Mg-W インキョク キタイ キンゾク ノ Mg ノ カクサン , チュウカンソウ ナラビニ デンシ ホウシャ

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Since the diffusion of the activator in cathode base metal and through the interface layer is very important for thermionic emission, the basic points in the problem were examined in Ni-Mg-and Ni-Mg-W base metals. The results are as follows: (1) The diffusion rate of magnesium in Ni-Mg-W base metal was measured at various temperatures between 920° and 1050° by evaporation methode in vacuum. The results are expressed by the relation, D=2.1exp(−61,800⁄RT) cm2 sec−1. (2) By heating Ni-Mg-W base metal in the decomposed gas of alkaline earth carbonate, the diffusion rate of magnesium from the base metal is decreased, while no change can be perceived with the naked eye. (3) By forming the interface layer between the base metal and the coated oxides, the diffusion rate of magnesium from the base metal is much decreased and the decreasing rate is remarkable in the case of Ni-Mg-W base metal. (4) By measuring the dependence of the electron emission on temperature with the experimental diode tube, it is shown that the electron emission is limited by the diffusion of activator not through the base metal but throngh the interface layer.

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