Silicides of Ti, Zr, Ce, and Nb were investigated to determine the phases present at temperatures around 2000°K. Ce‐C and Nb‐C systems were also investigated to a limited extent. Reactions of silicides of Ti, Zr, Ce, Nb, Ta, Mo, and W with carbon were studied at these temperatures. Also, a limited amount of work was done on the reactions of some silicides with nitrogen. The data have been used to establish ternary phase diagrams for the systems and to obtain upper and lower limits for heats of formation of the silicides.