Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-27T18:35:53.805Z Has data issue: false hasContentIssue false
  • English
  • Français

Electrical Properties of Na2O - SiO2 Dried Gels

Published online by Cambridge University Press:  15 February 2011

D. Ravaine ,
J. Traore ,
L. C. Klein  and
I. Schwartz
D. Ravaine
Affiliation:
Laboratoire d'Energetique Electrochimique ENSEEG BP 75 38402, Saint Martin d'Heres, FRANCE
J. Traore
Affiliation:
Laboratoire d'Energetique Electrochimique ENSEEG BP 75 38402, Saint Martin d'Heres, FRANCE
L. C. Klein
Affiliation:
Rutgers University, Department of Ceramics, P.O. Box 909, Piscataway, NJ 08854, USA
I. Schwartz
Affiliation:
Rutgers University, Department of Ceramics, P.O. Box 909, Piscataway, NJ 08854, USA
Get access

Abstract

Gels with compositions Na2O-(1-x)SiO2 were prepared from tetraethylorthosilicate (TEOS) with sodium acetate and from tetramethylorthosilicate (TMOS) with sodium methoxide or TEOS with sodium ethoxide. After gelation (10 min.) the samples were slowly dried for about one month at room temperature. Thermogravimetric analysis (up to 500°C) in air and O2 atmosphere was performed. The electrical properties were studied in air by impedance spectroscopy during successive temperature cycles starting from room temperature dried gels of composition 0.10 Na2O 0.90 SiO2. Protonic conductivity appears to be eliminated after reaching the 2nd stage of the drying process (200°C). The activation energies for conduction and the conductivities show small discrepancies from known values for homogeneous glasses of equivalent compositions. Considering the effect of water on the conductivity of glasses prepared by the melting procedure, one can estimate the residual water content in the so-called dried gels to be close to 0.5 wt %.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 32: Symposium B – Better Ceramics Through Chemistry I , 1984 , 139
Copyright
Copyright © Materials Research Society 1984

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

1. Ribes, M., Carette, B. and Maurin, M., J. de Physique C9–12 (1982) 403.Google Scholar
2. Malugani, J. P. and Robert, G.; Mat. Res. Bull. 14 (1979) 1075.Google Scholar
3. Malugani, J. P., Fahys, B., Mercier, R., Robert, G., Duchange, J. P., Baudry, S., Broussely, M. and Gabano, J. P., to be published in Proceedings of SSI 83, North Holland.Google Scholar
4. Hench, L. L., Prassas, M. and Phalippou, J.; J. of Non Cryst. Solids 53 (1982) 183.CrossRefGoogle Scholar
5. Ravaine, D. and Souquet, J. L.; J. Chim. Phys. 5 (1974) 693.Google Scholar
6. Otto, K. and Milberg, M. E.; J. Am. Ceram. Soc. 51 (1968) 326.Google Scholar
7. Charles, R. J.; J. Am. Ceram. Soc. 49 (1966) 55.Google Scholar
8. Haven, Y. and Verkerk, B.; Phys. Chem. Glasses 6 (1965) 38.Google Scholar
9. Hakim, R. M. and Uhlmann, D. R.; Phys. Chem. Glasses 12 (1971) 132.Google Scholar
10. Takata, M., Acocella, J., Tomozawa, M. and Watson, E. B.; J. Am. Ceram. Soc. 64 (1981) 719.Google Scholar
11. Takata, M., Acocella, J., Tomozawa, M. and Watson, E. B.; J. Am. Ceram. Soc. 65 (1982) 91.Google Scholar