Measurement of Activity of Na<SUB>2</SUB>O in Na<SUB>2</SUB>O-SiO<SUB>2</SUB>-P<SUB>2</SUB>O<SUB>5</SUB> Ternary melt Using Sodium Beta-Alumina as a Solid Electrilyte

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  • Yamaguchi Shu
    Graduate Student, Tokyo Institute of Technology
  • 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>-P<SUB>2</SUB>O<SUB>5</SUB>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-P2O5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 P2

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Abstract

The activity of Na2O referred to its pure liquid state in Na2O-SiO2-P2O5 ternary melt has been determined by the EMF method constructing galvanic cell, using sodium beta-alumina as a solid electrolyte, written as;<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentMeasurements of EMF were carried out in the composition range of higher Na2O mole fraction region than conjective line between Na2O·P2O5 and SiO2, at T=1173-1673 K. Na2O-SiO2-Fe2O3 melts were employed as a reference melt, after Na2O activity in these melts was determined by the same method using Na2CO3(l)+CO2(g)+O2(g) as a reference. A determined value of Na2O activity in Na2O-P2O5 melt of XNa<SUB>2O</SUB>=0.5 was about 10−13 at 1573 K and was nearly 8 times as small in the order of magnitude as that in Na2O-SiO2 system at the same temperature and Na2O mole fraction.<BR>\oindentEstimated iso-activity lines of Na2O in Na2O-SiO2-P2O5 ternary melt were drawn almost parallel to the conjective line between Na2O·P2O5 and SiO2, and the density of the lines became higher, as XNa<SUB>2O</SUB> became higher. The activities of SiO2 and P2O5 in the system were calculated by integrating Gibbs-Duhem equation by means of Schuhmann, using estimated thermodynamic value, and the iso-activity lines of SiO2 and P2O5 were suggested.

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