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LiF-NiF2 system: high temperature stability study of Li2NiF4(s) and interaction of fuel salts of molten salt reactor with structural material components

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Abstract

High temperature interaction of LiF-NiF2 system is characterized with the ternary compound, Li2NiF4(s). The compound has been synthesized by solid state route. Li2NiF4(s) has been characterized with XRD technique and its micro-homogeneity and surface morphology have been tested with EDS and SEM technique, respectively. In order to study the thermodynamic stability, the Gibbs energy of formation, ΔfG°m(T), of Li2NiF4(s) has been measured with solid electrolyte galvanic cell technique and its measured ΔfG°m(T) can be expressed as ΔfG°m(T) [Li2NiF4(s)] / k.J mol−1 = (-1902.2 ± 1.1) + (0.3491 ± 0.0016) × (T/K). Using the experimental thermodynamic data, ternary phase diagram and fluorine potential diagram of Li-Ni-F2 system have been calculated in order to study the stability domain and coexisting phases of Li2NiF4(s) at reactor operating temperature. The stability of Li2NiF4(s) has also been investigated in the presence of oxygen impurity by calculating chemical potential diagram of Li-Ni-F-O system and ternary phase diagram of LiF-NiF2-O2 system at the same temperature. In the study, interaction of major structural components, Ni, Cr, and Fe, with fuel salt components (ThF4 and UF4) of MSR has also been investigated at different temperatures.

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Notes

  1. High pure (moisture and oxygen free) argon.

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Acknowledgements

The authors are thankful to Dr. S. Kannan, Head, Fuel Chemistry Division, for his constant support and encouragement. The authors are also thankful to Smt. Geeta R. Patkare and Shri. Muhammed Shafeeq for XRD analysis of the samples and Shri Rahul Agarwal for SEM and EDS study.

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Authors and Affiliations

  1. Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India

    Sumanta Mukherjee & Smruti Dash

  2. Homi Bhabha National Institute (HBNI), Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India

    Sumanta Mukherjee & Smruti Dash

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  1. Sumanta Mukherjee
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  2. Smruti Dash
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Correspondence to Sumanta Mukherjee.

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Mukherjee, S., Dash, S. LiF-NiF2 system: high temperature stability study of Li2NiF4(s) and interaction of fuel salts of molten salt reactor with structural material components. J Solid State Electrochem 26, 1037–1050 (2022). https://doi.org/10.1007/s10008-022-05134-w

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