Thermodynamic assessment of the Nb–Si–Ti system

The impact of Ti and temperature on the stability of Nb5Si3 phases: a first-principles study

“…authors did not clarify which 5–3 polymorph was formed), and the projection gave a primary Nb 5 Si 3 solidification area without specifying whether the primary silicide was the βNb 5 Si 3 or the αNb 5 Si 3 or the hexagonal Ti 5 Si 3 based 5–3 silicide [10]. Geng et al [11] proposed a liquidus projection for the Nb-Ti–Si ternary system with a large primary αNb 5 Si 3 solidification area. Li et al [12] revised the Nb-Ti–Si liquidus projection based on a study of ternary alloys in the Nb 5 Si 3 -Ti 5 Si 3 region.…”

Liquid–solid phase equilibria in Nb-rich corner of the Nb–Ti–Si–B system

“…The calculations from Yang's thermodynamic description yielded good agreements with experimental observations. Recently, Geng et al modified the thermodynamic description of the binary Nb-Si system based on David's assessment [18], and optimized the Nb-Ti-Si ternary system [19]. Geng's work is consistent with Yang's work in major features.…”

Thermodynamic modelling of the Nb–Ni–Si phase diagram based on the 1073 K isothermal section using ab initio calculations

“…Some thermodynamic descriptions of the Nb-Si system are available [17][18][19][20][21][22] with a few variations regarding models for the stable phases. For the present work we adopted the assessment performed by Geng et al [22], which is an update of the description carried out by Geng et al [21], with a three-sublattice model for the H-Nb 5 Si 3 phase.…”

“…For the present work we adopted the assessment performed by Geng et al [22], which is an update of the description carried out by Geng et al [21], with a three-sublattice model for the H-Nb 5 Si 3 phase. The work of Geng et al [21], on its turn, was based on David et al [20], who had already described some of the intermediary phases as non-stoichiometric compounds. The resulting Nb-Si binary phase diagram is presented in Fig.…”

“…(21), is complicated by the fact that many of the end-members lie on the Nb-Ni binary system. Therefore, changing these parameters would lead to the necessity of revising the thermodynamic description of this binary as well.…”