Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-26T07:08:10.709Z Has data issue: false hasContentIssue false
  • English
  • Français

New Mixed Conductors Based on Doped Layered Perovskites

Published online by Cambridge University Press:  10 February 2011

Carlos Navas ,
Harry L. Tuller  and
Hans-Conrad zur Loye
Carlos Navas
Affiliation:
Dept. of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Harry L. Tuller
Affiliation:
Dept. of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Hans-Conrad zur Loye
Affiliation:
Dept. of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208
Get access

Abstract

A series of doped Ruddlesden-Popper phases, of general formula Sr3Ti2−xMxO7−δ (M=Al, Ga, Co), were synthesized and their electrical conductivity characterized as a function of temperature and oxygen partial pressure. For fixed-valent dopants, p-type conductivity predominates at p(O2)>10−5 atm, followed by a p(O2)-independent electrolytic regime, and n-type electronic conductivity at very low p(O2). The electrolytic regime exhibits activation energies in the range 1.7-1.8 eV. Doping with transition metals such as Co results in a very significant increase in total conductivity with a p-type conductivity at high p(O2). Furthermore, an apparent ionic regime at intermediate p(O2) is observed, characterized by high conductivity (>10−2 S/cm at 700 °C) and low activation energy (0.7 eV). This interpretation is consistent with iodometric measurements as interpreted by a defect chemical model. Other measurements are in progress to confirm this conclusion.

Keywords

DefectsIonic conductivityPerovskitesFuel CellsSensors
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 533
Copyright
Copyright © Materials Research Society 1999

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. Minh, N.Q. and Takahashi, T., Science and Technology of Ceramic Fuel Cells, 1995, Elsevier.Google Scholar
2. Tuller, H.L., in High Temperature Electrochemistry: Ceramics and Metals Poulsen, F.W. et al. , Eds. 1996, Risø National Laboratory: Røskilde, Denmark, p. 139–153.Google Scholar
3. Kendall, K.R., Thomas, J.K., and Loye, H.C. zur, Chem. Mater., (1995), 7(1), p.50–57.Google Scholar
4. Kendall, K.R., Navas, C., and Loye, H.-C. zur. in Materials Research Society Symposium Proceedings: Solid State lonics IV.Nazri, G.-A., Tarascon, J.-M., and Armand, M., Eds. 1995. Boston, MA: MRS, p. 355–360.Google Scholar
5. Navas, C. and Loye, H.C. zur, Solid State Ionics, (1997), 93, p. 171–176.Google Scholar
6. Ruddlesden, S.N. and Popper, P., Acta Cryst., (1957), 10, p.538–539.Google Scholar
7. Ruddlesden, S.N. and Popper, P., Acta Cryst., (1958), 11, p.54–55.Google Scholar
8. Dann, S.E. and Weller, M.T., J. Solid State Chem., (1995), 115, p.499–507.Google Scholar
9. Dann, S.E., Weller, M.T., and Currie, D.B., J. Solid State Chem., (1992), 97, p.179–185.Google Scholar
10. , Mizutani, J. Chem. Soc. (Japan) Ind. Ed., (1970), 73, p.1097–1103.Google Scholar
11. Tuller, H.L., in Nonstoichiometric Oxides, O.T. Sorensen, , Eds. 1981, Academic Press, Inc.: New York, p.271–332.Google Scholar
12. Navas, C., Tuller, H.L., and zur Loye, H.-C., unpublishedGoogle Scholar
13. Jansen, V.M. and Hoppe, R., Z. Anorg. Allg. Chem., (1973), 398, p.54.Google Scholar
14. Jansen, V.M. and Hoppe, R., Z. Anorg. Allg. Chem., (1974), 408, p.75.Google Scholar
15. Jansen, V.M. and Hoppe, R., Z. Anorg. Allg. Chem., (1974), 409, p.152.Google Scholar
16. Bezdicka, P., Wattiaux, A., Grenier, J.C., Pouchard, M., Hagenmuller, P., Z. anorg, allg. Chem., (1993), 619, p. 7 and references within.Google Scholar
17. Liu, L. M., Lee, T. H., Qui, L., Yang, Y. L., Jacobson, A. J., Mat. Res. Bull., (1996), 31, p. 29.Google Scholar
18. Yoshiasa, A., Inoue, Y., Kanamaru, F., Koto, K., J. Solid State Chem., (1990), 86, p. 75.Google Scholar
19. Mineshige, A., Inaba, M., Yao, T., Oguji, Z., J. Solid State Chem., (1996), 121, p.423–429.Google Scholar