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Insight into thermodynamic process and dry preparation of lanthanum fluoride

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Abstract

As an important functional material, lanthanum fluoride (denoted as LaF3) shows promising application in infrared thermometry, infrared thermography and fluoride glass optical fiber, etc. Although great process has been obtained in preparing rare earth fluorides such as GdF3, YF3, and NdF3, the thermodynamic process and synthesis of LaF3 remain a challenge. Herein, the thermodynamic process is explored by theoretical calculation and cxs \(\Delta_{{\text{r}}} H\) <0, \(\Delta_{{\text{r}}} G\) <0, \(K_{{\text{p}}}\) >109, indicating that the whole fluorination reaction is an exothermic reaction and can be fully carried out. Moreover, we now report an optimum fluorination process of LaF3. By exploring the effects of reaction temperature, holding time, material layer thickness and HF gas flow on fluorination rate k, the reliability of theoretical calculation has been verified, the best fluorination parameters have been obtained and the fluorination rate can reach more than 97%. This work may shed some light on the large-scale industrial production of high-grade LaF3, and promote its applications in infrared optical field, nuclear medicine and high-energy physics.

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Acknowledgements

This study is financially supported by the Aero Engine and Gas Turbine Major Project (J2019-VI-0023-0140) and Key R & D Plan of Hebei Province (19211503D). Engineer W. L. Lu is supported by Youth Talent Lifts plan of Grinm Group Co., Ltd. (0111970400364).

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Authors and Affiliations

  1. GRIREM Advanced Materials Co., Ltd., Beijing, 100088, China

    Ruiying Miao, Wenli Lu, Dehong Chen, Xiaowei Zhang, Bo Pan, Shiying Chen, Yixuan Wang & Zhiqiang Wang

  2. National Engineering Research Center for Rare Earth, GRINM Group Co., Ltd., Beijing, 100088, China

    Ruiying Miao, Wenli Lu, Dehong Chen, Xiaowei Zhang, Shiying Chen, Yixuan Wang & Zhiqiang Wang

  3. GRIREM Hi-Tech Co., Ltd., Hebei, 065201, China

    Ruiying Miao, Wenli Lu, Dehong Chen, Xiaowei Zhang, Bo Pan & Zhiqiang Wang

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  1. Ruiying Miao
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Correspondence to Wenli Lu.

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Miao, R., Lu, W., Chen, D. et al. Insight into thermodynamic process and dry preparation of lanthanum fluoride. J Therm Anal Calorim 147, 11433–11443 (2022). https://doi.org/10.1007/s10973-022-11349-w

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  • DOI: https://doi.org/10.1007/s10973-022-11349-w

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