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A Thermodynamic Assessment of the Li-Ge System

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Abstract

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 \(L_{i}^{\text{Liquid}}\) 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.

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Acknowledgments

The financial support from the National Natural Science Foundation of China (Grant No. 51429101) is greatly acknowledged.

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Authors and Affiliations

  1. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Hunan, 410083, People’s Republic of China

    Shimin Wang, Yong Du & Shuhong Liu

  2. College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou, 412007, China

    Yingbiao Peng

  3. College of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Peng Zhou

  4. Hunan Key Laboratory for Supermicrostructure and Ultrafast Process, School of Physics and Electronics, Central South University, Hunan, 410083, People’s Republic of China

    Xiaoming Yuan

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  1. Shimin Wang
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Correspondence to Yong Du.

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Wang, S., Du, Y., Peng, Y. et al. A Thermodynamic Assessment of the Li-Ge System. J. Phase Equilib. Diffus. 39, 315–323 (2018). https://doi.org/10.1007/s11669-018-0632-5

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  • DOI: https://doi.org/10.1007/s11669-018-0632-5

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