An extremely reliable tungsten silicide is formed by reacting tungsten
film with silicon wafer. The tungsten film is RF magnetron sputter-de
posited onto a silicon wafer and is subjected to a novel discharge tre
atment. As a result, an amorphous tungsten silicide is induced. Finall
y, an effective tungsten silicide with tetragonal end phase and low sh
eet resistance forms when the sample is suitably vacuum-annealed at hi
gh temperature.