Phase stabilities of self-organized nc-TiN/a-Si3N4 nanocomposites and of Ti1-xSxNy solid solutions studied by ab initio calculation and thermodynamic modeling

被引:70
作者
Zhang, R. F. [1 ]
Veprek, S. [1 ]
机构
[1] Tech Univ Munich, Dept Chem, D-85747 Munich, Germany
关键词
nc-TiN/a-Si3N4; nanocomposites; Ti-Si-N solid solution; phase segregation; ab initio calculation; thermodynamic modeling;
D O I
10.1016/j.tsf.2007.07.134
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Bulk properties of stable binary fcc-TiN and hcP(beta)-Si3N4, hypothetical fcc-SiN and hcp(beta)-Ti3N4, and ternary Ti1-xSixNy phases are calculated by ab initio method. The values of total energies are then used for thermodynamic calculations of the lattice instabilities of hypothetical binary phases of fcc-SiN and hcp-Ti3N4, and of the interaction parameters of ternary Ti1-xSixNy phases. Based on these data, Gibbs free energy diagrams of the quasi-binary TiNy-SiNy system are constructed in order to study the relative phase stability of the metastable ternary fcc- and hcp-Ti1-xSixNy phases over the entire range of compositions. The results are supported by the published data from chemical and physical vapor deposition experiments. The constructed Gibbs free energy diagram and phase selection diagram of quasi-binary TiNy-SiNy system in fcc structure show that metastable fcc-Ti1-xSixN coatings should undergo chemically spinodal decomposition into coherent fcc-TiN and fcc-SiN. Due to a high lattice mismatch between fcc-TiN and hcp-Si3N4, and to much higher lattice instability of fcc-SiN with respect to stable hcp-Si3N4, only about one monolayer of pseudomorphic SiNy interfacial phase is stable. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:2264 / 2275
页数:12
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