A Thermodynamic Assessment of the Li-Ge System

作者：Wang, Shimin; Du, Yong^*; Peng, Yingbiao; Zhou, Peng; Yuan, Xiaoming; Liu, Shuhong

来源：Journal of Phase Equilibria and Diffusion, 2018, 39(3): 315-323.

DOI：10.1007/s11669-018-0632-5

• CALPHAD method
• exponential equation
• Li-Ge system
• phase diagram

The thermodynamic modeling of the Li-Ge binary system was carried out using CALPHAD (CALculation of PHAse Diagram) method. The liquid phase was described as substitutional solution phase, while the nine intermetallic compounds Li17Ge4, Li4.1Ge, Li15Ge4, Li13Ge4, Li14Ge6, Li9Ge4, Li12Ge7, LiGe and Li7Ge12 were treated as stoichiometric compounds. The temperature dependent interaction parameters of liquid were described by either exponential (Kaptay equation) or linear equation, respectively. The comparisons between experimental data and modeled results are given. The calculations based on the obtained thermodynamic parameters are in good agreement with both phase diagram data and thermodynamic values. In particular, the liquid phase was successfully described by the exponential equation for it is possible to avoid the occurrence of the artificial miscibility gap at high temperatures.

• 出版日期2018-6
• 单位中南大学; 湖南工业大学; 湖南科技大学