Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 21    No. 2    February 2011

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Raman spectroscopy and ionic structure of Na3AlF6-Al2O3 melts
HU Xian-wei, QU Jun-yue, GAO Bing-liang, SHI Zhong-ning, LIU Feng-guo, WANG Zhao-wen

School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

Abstract:Raman spectrum of molten cryolite was recorded. Based on the new understanding of the scattering coefficients, contents of various structural entities in acidic NaF-AlF3 melts at 942−1 024 °C in previous research were reanalyzed. The new quantitative analysis results show that when cryolite ratio(CR) is less than 2, AlF4 is the dominant anion in the melts, and its mole fraction is about 0.70 for melts with CR=1.5 and 0.50 for melts with CR=2. When CR is more than 2.5, the mole fraction of AlF63− is relatively large, which is around 0.45 for melts with CR=2.5. Ionic structure of Na3AlF6-Al2O3 melts was investigated by UV-Raman spectroscopy. Octahedral AlF63− and tetrahedral AlF4 are proved to exist with possible partial replacement of F by O2−. Al2O2F42− with a large scattering coefficient also exists in the melts in which alumina concentration is more than 4% (mass fraction). The increase of temperature causes blue-shift of the bands in the Raman spectra.


Key words: Raman spectroscopy; Na3AlF6-Al2O3 melts; scattering coefficient; complex ion; aluminum electrolysis; sealed cell

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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