Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-23T11:42:10.937Z Has data issue: false hasContentIssue false
  • English
  • Français

Thermodynamic partial properties of Na2O in Nasicon solid solution, Na1+xZr2SixP3−xO12

Published online by Cambridge University Press:  31 January 2011

G. M. Kale  and
K. T. Jacob
G. M. Kale
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore−560012, India
K. T. Jacob
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore−560012, India
Get access

Abstract

The thermodynamic activity of sodium oxide (Na2O) in the Nasicon solid solution series, Na1+xZr2SixO12, has been measured in the temperature range 700–1100 K using solid state galvanic cells: Pt|CO2 + O2|Na2CO3∥Na1+xZr2SixP3−xO12∥(Y2O3)ZrO2∥In + In2O3|Ta, Pt for 1 ≤ ⊠ ≤ 2.5, and Pt∥CO2 + O2∥Na2CO3∥β-alumina∥Na1+xZr2SixP3−xO12∥Ar + O2∥Pt for x = 0, 0.5, 2.5, and 3. The former cell, where the Nasicon solid solution is used as an electrolyte along with yttria-stabilized zirconia, is well suited for Nasicon compositions with high ionic conductivity. In the latter cell, β-alumina is used as an electrolyte and the Nasicon solid solution forms an electrode. The chemical potential of Na2O is found to increase monotonically with x at constant temperature. The partial entropy of Na2O decreases continuously with x. However, the partial enthalpy exhibits a maximum at x = 2. This suggests that the binding energy is minimum at the composition where ionic conductivity and cell volume have maximum values.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 2 , April 1989 , pp. 417 - 422
Copyright
Copyright © Materials Research Society 1989

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Imai, A. and Harata, M., Jap. J. Appl. Phys. 11, 180 (1972).CrossRefGoogle Scholar
2Maruyama, T., Saito, Y., Matsumoto, Y., and Yano, Y., Solid State Ionics 17, 281 (1985).CrossRefGoogle Scholar
3Hong, H.Y-P., Mat. Res. Bull. 11, 173 (1976).CrossRefGoogle Scholar
4Alpen, U. von, Bell, M. F., and Wichelhaus, W., Mat. Res. Bull. 14, 1317 (1979).CrossRefGoogle Scholar
5Alpen, U. von, Bell, M. F., and Hofer, H. H., Solid State Ionics 3&4, 215 (1981).Google Scholar
6Clearfield, A., Subramanian, M. A., Wang, W., and Jerus, P., Solid State Ionics 9&10, 895 (1983).CrossRefGoogle Scholar
7Kohler, H. and Schulz, H., Solid State Ionics 9&10, 795 (1983).CrossRefGoogle Scholar
8Shibanov, E.V. and Chuklantsev, V.G., Russ. J. Phys. Chem. 48, 133 (1974).Google Scholar
9Maier, J., Warhus, U., and Gmelin, E., Solid State Ionics 18&19, 969 (1986).CrossRefGoogle Scholar
10Pankratz, L. B., Stuve, J.M., and Gokcen, N. A., Thermodynamic Data for Mineral Technology (U.S. Department of Interior, Bureau of Mines, Bull. 677, 1984), pp. 142.Google Scholar
11Pankratz, L.B., Thermodynamic Properties of Elements and Oxides (U.S. Department of Interior, Bureau of Mines, Bull. 672, 1982), pp. 94 and 257.Google Scholar
12Jacob, K.T., Trans. Inst. Min. Met. 87, C–165 (1978).Google Scholar
13Qui, D. Tran, Capponi, J. J., and Joubert, J. C., J. Solid State Chem. 39, 219 (1981).CrossRefGoogle Scholar
14Goodenough, J.B., Hong, H. Y-P., and Kafalas, J.A., Mat. Res. Bull. 11, 203 (1976).CrossRefGoogle Scholar
15Akila, R. and Jacob, K. T., J. Appl. Electrochem. 18, 245 (1988).CrossRefGoogle Scholar