Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-25T03:56:07.608Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis and thermoelectric power factor of LSCO perovskites

Published online by Cambridge University Press:  01 February 2011

Julio E. Rodriguez
Julio E. Rodriguez*
Affiliation:
[email protected], Universidad Nacional de Colombia, Department of Physics, Apartado Aereo 85814, Bogota, Cund., o1, Colombia, (571) 3165000 ext. 13034/13021, (571)3165135
Get access

Abstract

Measurements of Seebeck coefficient, S(T) and electrical resistivity, ρ(T) on polycrystalline La2−xSrxCuO4+d(LSCO) (0<x≤0.2) samples are reported. The Seebeck coefficient is positive in whole measured temperature range (77K and 300K) and it decreases with Sr content. At room temperature S(T) changes from 400 μ/K for the samples with the lowest levels of Sr to 30 μV/K for the samples with the highest Sr levels. The behavior of S(T) fits to Heikes model, which describes the behavior of Seebeck coefficient in systems where the correlated hopping is present. With the Sr content, the electrical resistivity changes its behavior from semiconducting to metallic and it took values from 2.4 to 10−3 Ωcm. From S(T) and rho(T) measurements the thermoelectric power factor, PF was obtained. The maximum values for PF were about 5 μW/K2cm in the samples where x= 0.03, which are comparable to the typical values for conventional thermoelectric semiconductors. The structural and morphological properties of the samples were studied by x-ray diffraction analysis and Scanning Electron Microscopy (SEM) respectively. The behavior of transport properties opens de possibility of considering this family of perovskite-compounds as a thermoelectric material which works below room temperature.

Keywords

thermoelectricityceramicoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 886: Symposium F – Materials and Technologies fore Direct Thermal-to-Electric Energy Conversion , 2005 , 0886-F11-05
Copyright
Copyright © Materials Research Society 2006

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] Mahan, G., Sales, B. and Sharp, , Physics Today 50, 42(1997).Google Scholar
[2] Li, S., Funahashi, R., Matsubara, I., Yamada, H., Ueno, K. and Ykebe, M., Ceramics International 27, 321–324(2001).Google Scholar
[3] Fuyine, Y., Fujishiro, H., Suzuki, K., Kashiwada, Y. and Ikebe, M., Journal of Magnetism and magnetic Materials 272–276, 104–105(2004).Google Scholar
[4] Pool, C.P., Farash, H. and Crewich, R., Superconductivity, Academic Press, London, 1995.Google Scholar
[5] Casart, M. and Issi, J. P., CRC Handbook of Thermoelectrics, Ed. Rowe, D.M., CTC Press, Boca Raton, Fl, 1995. chap. 30.Google Scholar
[6] Kaiser, A.B. and Uher, C., Handbook of Applied Superconductivity, ed. Seeber, B. Institute of Physics Publishing, Bristol, 1998.Google Scholar
[7] Rowe, D. M., CRC Handbook of thermoelectrics, CRC Press, Boca Raton Fl, 1995.Google Scholar
[8] Nolas, G. S., Sharp, J. and Goldsmid, H. J. Thermoelectrics, basic principles and new materials developments, Springer-Verlag, Berlin, 2001.Google Scholar
[9] Slack, G., in Handbook of Thermoelectrics CRC Press, Ed. Rowe, D.M., 407–440, Boca Raton Fl, 1995.Google Scholar
[10] Chaikin, P. M. in Organic supercondictivity, Krezin, V.Z. and Little, W.A., Ed. Plenum Press, New York, 1990.Google Scholar
[11] Kwak, J.F., Beni, G. and Chaikin, P.M., Phys. Rev. B 13, 647–651(1976).Google Scholar
[12] Van Lien, N. and Toi, D. D., Phys. Lett. A, A261, 108–113(1999).Google Scholar
[13] Cooper, J.R., Alavi, B., Zhou, L.W., Beyermann, W.P. and Gruner, G., Phys. Rev. B, 35, 8794(1987).Google Scholar