Density and ionic structure of NdF3-LiF melts
来源期刊：Journal of Rare Earths2010年第4期
论文作者：胡宪伟 王兆文 高炳亮 石忠宁 刘风国 曹晓舟
文章页码：587 - 590
摘 要：NdF3-LiF melts are commonly used in the electrolysis process of metallic neodymium production. Research on the density and ionic structure of the electrolyte is important for its close connection with the electrolysis mechanism and process. In this paper, the density of LiF-NdF3 melts was studied by the Archimedes method. The results showed that the density decreased with increasing temperature and LiF contents. The changing law was discussed and explained in terms of the micro ionic structure of the melts. The ionic structure of 25 mol.% NdF3-75 mol.%LiF was then quantitatively analyzed on the condition that [Nd]3+ existed in the forms of both NdF63– and NdF4–. The results indicated that NdF63–, NdF4–, and F–took the amount of 22 mol.%–25 mol.%, 25 mol.%, and 50 mol.%–52 mol.% respectively in the anions of the melts in the temperature range of 950–1050 oC. In addition, NdF63–was easier to decompose at a higher temperature.
胡宪伟，王兆文，高炳亮，石忠宁，刘风国，曹晓舟
School of Materials and Metallurgy, Northeastern University
摘 要：NdF3-LiF melts are commonly used in the electrolysis process of metallic neodymium production. Research on the density and ionic structure of the electrolyte is important for its close connection with the electrolysis mechanism and process. In this paper, the density of LiF-NdF3 melts was studied by the Archimedes method. The results showed that the density decreased with increasing temperature and LiF contents. The changing law was discussed and explained in terms of the micro ionic structure of the melts. The ionic structure of 25 mol.% NdF3-75 mol.%LiF was then quantitatively analyzed on the condition that [Nd]3+ existed in the forms of both NdF63– and NdF4–. The results indicated that NdF63–, NdF4–, and F–took the amount of 22 mol.%–25 mol.%, 25 mol.%, and 50 mol.%–52 mol.% respectively in the anions of the melts in the temperature range of 950–1050 oC. In addition, NdF63–was easier to decompose at a higher temperature.
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