| Synthesis of GdF3 from the Gd2O3-NH4HF2 system |
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| 作者姓名： | HAO Zhanzhong ZHANG Jianliang WANG Bin ZHANG Xidong |
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| 作者单位： | [1]Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China [2]Baotou Teachers College, Baotou 014030, China |
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| 摘 要： | GdF3 was synthesized with Gd2O3 and NH4HF2 under atmospheric pressure and vacuum. The effects of pressure,temperature,and reactant ratio on the reaction process were investigated. A new mechanism for the synthesis of GdF3 was proposed. Powdered Gd2O3 started to react with NH4HF2 at low temperature,and the products were GdNH4F4,NH4F,NH3,and H2O. GdNH4F4 decomposed to GdF3 and NH4F after further high-temperature treatment,accompanying the volatilization and decomposition of NH4F. The whole process could be divided into three steps： synthesis,decomposition,and deamination. The initial and final reaction temperatures decreased under vacuum condition. An optimized process for the preparation of GdF3 was obtained： synthesis under atmospheric pressure at low temperature and decomposition and deamination under vacuum at high temperature.
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| 关 键 词： | 无机化学 钆 NH4HF2 合成方法 |
| 收稿时间： | 15 October 2006 |
| 修稿时间： | 2006-10-15 |
Synthesis of GdF3 from the Gd2O3-NH4HF2 system |
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| HAO Zhanzhong ZHANG Jianliang WANG Bin ZHANG Xidong.Synthesis of GdF3 from the Gd2O3-NH4HF2 system[J].Rare Metals,2007,26(5):482-487. |
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| Authors: | HAO Zhanzhong ZHANG Jianliang WANG Bin ZHANG Xidong |
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| Affiliation: | 1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China;2. Baotou Teachers College, Baotou 014030, China;1. Department of Inorganic and Physical Chemistry, Tyumen State University, Tyumen, 625003, Russia;2. Department of General Chemistry, Northern Trans-Ural Agricultural University, Tyumen, 625003, Russia;3. Department of General and Special Chemistry, Industrial University of Tyumen, Tyumen, 625000, Russia;4. Laboratory of Coherent Optics, Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia;5. Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russia;6. Center for Optical and Laser Materials Research, St. Petersburg State University, St. Petersburg, 199034, Russia;7. Department of Physics, Lappeenranta University of Technology LUT, Lappeenranta, 53850, Finland;1. A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, 38 Vavilov Street, Moscow 119991, Russia;2. M. V. Lomonosov Moscow State University of Fine Chemical Technologies Russia, 86 Vernadsky Prospect, Moscow 119571, Russia;3. Fiber Optics Research Center of Russian Academy of Sciences, 38 Vavilov Street, Moscow 119333, Russia |
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| Abstract: | GdF3 was synthesized with Gd2O3 and NH4HF2 under atmospheric pressure and vacuum. The effects of pressure,temperature, and reactant ratio on the reaction process were investigated. A new mechanism for the synthesis of GdF3 was proposed. Powdered Gd2O3 started to react with NH4HF2 at low temperature, and the products were GdNH4F4, NH4F, NH3,and H2O. GdNH4F4 decomposed to GdF3 and NH4F after further high-temperature treatment, accompanying the volatilization and decomposition of NH4F. The whole process could be divided into three steps synthesis, decomposition, and deamination. The initial and final reaction temperatures decreased under vacuum condition. An optimized process for the preparation of GdF3 was obtained synthesis under atmospheric pressure at low temperature and decomposition and deamination under vacuum at high temperature. |
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| Keywords: | inorganic chemistry Gd NH4HF2 synthesis |
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