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Investigation on the Phase Diagram of LiCl-KCl-NdCl3 Pseudo-Ternary System

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Abstract

The ternary phase diagram of LiCl-KCl-NdCl3 system has been investigated by differential thermal analysis (DTA), followed by characterization of the coexisting phases in the solid state by x-ray diffraction, in order to understand the interactions in the NdCl3-LiCl-KCl ternary system. The results of these experiments showed that LiCl and K2NdCl5 form a non binary join section. This divides the LiCl-KCl-NdCl3 system into two quasi-ternary sections, namely (1) LiCl-KCl-K2NdCl5 and (2) LiCl-K2NdCl5-NdCl3 systems. Both are simple eutectic ternary phase diagrams. The ternary eutectic temperatures and eutectic compositions are determined to be 316 ± 3 °C and 53.9 mol.% LiCl-38.7 mol.% KCl-7.4 mol.% K2NdCl5 in the LiCl-KCl-K2NdCl5 quasi-ternary section, while the other eutectic temperature and composition are determined to be 376 ± 9 °C and 46.2 mol.% LiCl-32.5 mol.% K2NdCl5-21.3 mol.% NdCl3 in the LiCl-K2NdCl5-NdCl3 quasi-ternary section. A quasi-ternary peritectic reaction is observed at 37.7 mol.% LiCl-36.2 mol.% KCl-26.1 mol.% K2NdCl5 at 445 ± 1°C. The primary and secondary crystallization temperatures for the samples are deduced from the heating runs of DTA traces, and the phases responsible for the various thermal events are ascertained. Isothermal sections at chosen temperatures and polythermal liquidus projection with isothermal contours are drawn over the ternary phase field.

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Authors and Affiliations

  1. Materials Chemistry Division, Material Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, Tamilnadu, 603102, India

    Sajal Ghosh, Rajesh Ganesan, R. Sridharan & T. Gnanasekaran

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  1. Sajal Ghosh
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  2. Rajesh Ganesan
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  3. R. Sridharan
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  4. T. Gnanasekaran
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Correspondence to Rajesh Ganesan.

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Ghosh, S., Ganesan, R., Sridharan, R. et al. Investigation on the Phase Diagram of LiCl-KCl-NdCl3 Pseudo-Ternary System. J. Phase Equilib. Diffus. 39, 916–932 (2018). https://doi.org/10.1007/s11669-018-0695-3

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  • DOI: https://doi.org/10.1007/s11669-018-0695-3

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