The relatively low thermal conductivity of barium tungsten cathode is mainly due to the properties of tungsten and barium contained in its composition. Tungsten is a metal with a high melting point, and the addition of barium can affect the thermal conductivity of the material. The specific thermal conductivity depends on factors such as the composition, structure, and purity of the cathode.
Generally speaking, the thermal conductivity of tungsten is relatively low, about 174 W/(m·K), because the lattice structure of tungsten and the bonding method between atoms lead to its relatively weak heat conduction performance. The addition of barium may affect the lattice structure of tungsten, but barium itself also has relatively low thermal conductivity.
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