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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Equivalent conductivity and its activation energy of NaF-AlF3 melts
HU Xian-wei(胡宪伟), WANG Zhao-wen(王兆文), GAO Bing-liang(高炳亮), SHI Zhong-ning(石忠宁),        KAN Hong-min(阚洪敏), LUO Xu-dong(罗旭东), TAO Wen-ju(陶文举)

The Key Laboratory of Ministry of Education for Electromagnetic Processing of Materials,
Northeastern University, Shenyang 110004, China

Abstract:Electrical conductivity of NaF-AlF3 melts was measured by continuously varying cell constant(CVCC) technique. Relationships between equivalent conductivity at 990−1 030 ℃ and temperature and composition, and relationship between equivalent conductivity activation energy and composition of the melts were then studied on the basis of two-step decomposition mechanism of AlF63−. According to the changes of molar fractions of different anions in NaF-AlF3 melts, courses of dependence of equivalent conductivity and its activation energy on composition were analyzed. The results show that the influence of temperature on equivalent conductivity of the melts is small in the researched temperature range, and equivalent conductivity increases with increasing the molar fraction of AlF3; there is a minimum point in the activation energy—composition curve when molar fraction of AlF3 is 0.29.

 

Key words: equivalent conductivity; equivalent conductivity activation energy; continuously varying cell constant technique; NaF-AlF3 melts

ISSN 1672-7029
CN 43-1423/U

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