Synthesis of GdF3 from the Gd2O3-NH4HF2 system
来源期刊：Rare Metals2007年第5期
论文作者：HAO Zhanzhong,),ZHANG Jianliang),WANG Bin,),and ZHANG Xidong) ) Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing ,China ) Baotou Teachers College,Baotou ,China
文章页码：482 - 487
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 volatiliza-tion 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 deami-nation under vacuum at high temperature.
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 volatiliza-tion 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 deami-nation under vacuum at high temperature.
关键词：
