a1 Department of Chemistry, School of Applied Science, University of Science and Technology Beijing, Beijing 100083, China
a2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
Isothermal sections at 1100 and 1500 °C were determined by X-ray powder diffraction method to reveal stable phases and chemical pathways in the Co–Si–C system. There is no ternary compound present in either isothermal. Cobalt silicides are formed in the Co-rich region at temperatures lower than those in the Si-rich region. CoSi2 reacts with carbon to form CoSi and SiC at 1500 °C, and Co2Si and CoSi are more stable in equilibrium with carbon. The results are also discussed in terms of thermodynamics and binding energy of the reacting substances.
(Received August 05 2008)
(Accepted September 20 2008)