کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1617681 1005691 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamic assessment of the Nb–Ge system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Thermodynamic assessment of the Nb–Ge system
چکیده انگلیسی

The Nb–Ge binary system has been thermodynamically assessed using the CALPHAD (Calculation of Phase Diagrams) approach on the basis of the experimental data of both the phase equilibria and the thermochemical properties. The reasonable models were constructed for all the phases of the system. The liquid and the terminal solid solution phases, Bcc-(Nb) and Diamond-(Ge), were described as the substitutional solutions with Redlich–Kister polynomials for the expressions of the excess Gibbs free energies. The intermediate phases (Nb3Ge), (Nb5Ge3), (Nb3Ge2) and (NbGe2) with homogeneity ranges were treated as the sublattice models Nb0.75(Ge,Nb,Va)0.25, Nb0.5(Nb,Ge)0.125(Ge,Va)0.375, (Nb,Ge)0.222(Nb,Ge)0.333Nb0.333(Ge,Va)0.111 and (Nb,Ge)0.333(Nb,Ge)0.667 respectively based on their structure features of atom arrangements. A set of self-consistent thermodynamic parameters for the Nb–Ge system was obtained. Using the present thermodynamic data, the calculation results can reproduce the experimental data well.

Research highlights▶ For the phases Nb3Ge2 and Nb3Ge, the reasonable sublattice models were constructed. ▶ A set of thermodynamic parameters for the Nb-Ge system was obtained. ▶ The optimized result can interpreter the vaporization of Ge during preparation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 6, 10 February 2011, Pages 3080–3088
نویسندگان
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