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Studies on ZrO2 Fluorination Using Ammonium Bifluoride

  • SYNTHESIS AND PROPERTIES OF INORGANIC COMPOUNDS
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Abstract

In this work, the thermal behavior of NH4HF2/ZrO2 mixtures with different mass ratio of NH4HF2 to ZrO2 have been analyzed from room temperature to 600°C by simultaneous thermogravimetry and differential thermal analysis (TG-DTA) and the critical temperature during the fluorination process has been determined. Moreover, NH4HF2/ZrO2 mixture before and after each critical temperature has been directly thermal treated and analyzed. The results indicate that the reaction between ZrO2 and NH4HF2 to form (NH4)3ZrF7 starts at room temperature, sharply increases at 126.8°C with the melting of NH4HF2, and finishes around 150°C. With heating, the removal of the absorbed H2O and NH3, as well as the sublimation of NH4HF2, occur at 155.8, 190.2, and 218.2°C, respectively; then (NH4)3ZrF7 decomposes sequentially through a several-step by the formation of (NH4)2ZrF6 at 246.5°C, NH4ZrF5 at 316.4°C and finally β-ZrF4 at 331.7°C in N2 gas. At 380°C, the transformation from β-ZrF4 to α-ZrF4 occurs.

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Funding

This research was supported by Natural Science Fund of Shandong Province (ZR2019MEE107, ZR2020KF024), Shandong Jiaotong University “Climbing” Research Innovation Team program (SDJTC1802), Science and technology planning project of Shandong Provincial Department of transportation (2020B88), Scientific Research Fund of Liaoning Provincial Education Department (LJKZ1337).

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Authors and Affiliations

  1. Naval Architecture and Port Engineering College, Shandong Jiaotong University, 264200, Weihai, China

    Junsheng Meng, Baisen Chen, Zhihui Chen, Chengshuo Li & Xiaoping Shi

  2. School of Mechanical Engineering and Automation, Shenyang Institute of Technology, 113122, Fushun, China

    Yuebo Zhou

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  1. Junsheng Meng
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Correspondence to Junsheng Meng.

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Junsheng Meng, Chen, B., Chen, Z. et al. Studies on ZrO2 Fluorination Using Ammonium Bifluoride. Russ. J. Inorg. Chem. 67 (Suppl 1), S1–S12 (2022). https://doi.org/10.1134/S0036023622601763

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