The Activity of Dilute Sodium in Liquid Au-Na Alloy

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概要

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• The electromotive force of the cell;<BR>Au–Na alloy |Na<SUB>2</SUB>CO<SUB>3</SUB>| CO<SUB>2</SUB>+O<SUB>2</SUB>, Pt-Rh,<BR>was determined as a function of the temperature and the concentration of sodium in the alloy. The results were consistent with the activity values determined previously by the equilibrium method. The overpotential due to the current passing through the Au–Na alloy surface is less than 1 mV per mA/cm<SUP>2</SUP> of the current density at 1400°K. The activity of sodium, referred to the pure liquid standard state, was calculated from the electromotive force of this cell. The activity coefficient of sodium in Au–Na alloy is:<BR>logγ<SUB>Na</SUB>=−2.55⁄<I>T</I>·10<SUP>−3</SUP>+0.39±0.05<BR>in the temperature range from 1250°K to 1500°K and in the concentration range of less than 10 atom%Na.

• 公益社団法人 日本化学会の論文

著者

• KATSURA Takashi

  Department of Chemistry

• Hirota Kazushi

  Department of Chemistry, Tokyo Institute of Technology

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