Barium tungsten cathodes are susceptible to oxidation. The tungsten in the barium tungsten cathode is a metal with a high melting point, but at high temperature and in the presence of oxygen, it may still react with oxygen to form oxides. Tungsten oxide will reduce the electron emission performance of the cathode, thereby affecting the performance and stability of the device.
Barium tungsten cathodes usually work in vacuum or inert atmosphere to reduce the influence of oxygen. In a vacuum environment, the oxygen content is very low, which can effectively prevent the oxidation of tungsten. In addition, the addition of barium can also reduce the work function of the cathode, making it easier for electrons to escape, thereby alleviating the impact of oxidation to a certain extent.
However, in some special cases, such as exposure to high oxygen environment or long-term use, the barium tungsten cathode may still be affected by oxidation. Therefore, avoiding exposing the cathode to a high-oxygen atmosphere during use and storage can help maintain its stable electron emission performance.
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