TY - JOUR
T1 - Thermodynamic assessment of the Nb-Ge system
AU - Geng, Tai
AU - Li, Changrong
AU - Du, Zhenmin
AU - Guo, Cuiping
AU - Zhao, Xinqing
AU - Xu, Huibin
PY - 2011/2/10
Y1 - 2011/2/10
N2 - 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), (Nb 3Ge2) 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.
AB - 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), (Nb 3Ge2) 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.
KW - CALPHAD technique
KW - Nb-Ge phase diagram
KW - Thermodynamic properties
UR - https://www.scopus.com/pages/publications/78651377216
U2 - 10.1016/j.jallcom.2010.12.005
DO - 10.1016/j.jallcom.2010.12.005
M3 - 文章
AN - SCOPUS:78651377216
SN - 0925-8388
VL - 509
SP - 3080
EP - 3088
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 6
ER -