Measurement of Activity of Na<SUB>2</SUB>O in Na<SUB>2</SUB>O-SiO<SUB>2</SUB> Binary Melt Using Beta-Alumina as a Solid Electrolyte

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  • Yamaguchi Shu
    Graduate Student, Tokyo Institute of Technology
  • Imai Atsuo
    Research and Development Center, Toshiba Corporation
  • Goto Kazuhiro S.
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology

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Other Title
  • β-アルミナ固体電解質を用いたNa<SUB>2</SUB>O-SiO<SUB>2</SUB>系融体中のNa<SUB>2</SUB>Oの活量の測定
  • β-アルミナ固体電解質を用いたNa2O-SiO2系融体中のNa2Oの活量の測定
  • ベータ アルミナ コタイ デンカイシツ オ モチイタ Na2O SiO2ケイ

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The chemical activity of sodium oxide in Na2O-SiO2 melt was determined by the EMF method, using beta-alumina as a solid electrolyte in the range from 0.2 to 0.6 mole fraction of sodium oxide at 1173 to 1673 K. The activity of sodium oxide in the reference melt of a fixed composition was measured in advance with a standard electrode of pure Na2CO3 melt under fixed partial pressures of oxygen and carbon dioxide.<BR>The activity of sodium oxide measured showed an extremely large negative deviation from the Raoult’s law with the values of 10−10 to 10−3 depending upon temperature and composition.<BR>Various thermodynamic properties of the Na2O-SiO2 binary solution have been determined from the activities of sodium oxide and silica.

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