TUNGSTEN ELECTRODE MATERIAL

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A tungsten electrode material which comprises a tungsten base material and oxide particles that are dispersed in the tungsten base material, and wherein the oxide particles are formed of an oxide solid solution in which Zr oxide and/or Hf oxide and a rare earth oxide of at least one rare earth element that is selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu are solid-solved. The content of the rare earth oxide relative to the total amount of the Zr oxide and/or the Hf oxide and the rare earth oxide is from 66% by mole to 97% by mole (inclusive); and the content of the oxide solid solution is from 0.5% by mass to 9% by mass (inclusive), while the balance being substantially made up of tungsten.