Gibbs free energies of the quasibinary TiNy-SiNy system are constructed to study the relative phase stability of the metastable ternary fcc(NaCl type) and amorphous Ti1-xSixNy solution phases over the entire range of compositions. The predicted cross point at about x=0.20-0.24 is supported by the published results from physical vapor deposition and chemical vapor deposition experiments. Based on the calculated properties of fcc-SiN phase, the physical origin of the formation of the amorphous phase is addressed.
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