Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-23T11:11:31.887Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis and thermoelectric properties of Bi2.5Ca2.5Co2Ox layered cobaltites

Published online by Cambridge University Press:  01 April 2005

Emmanuel Guilmeau ,
Masashi Mikami ,
Ryoji Funahashi  and
Daniel Chateigner
Emmanuel Guilmeau
Affiliation:
National Institute of Advanced Industrial Science and Technology, Osaka 563-8577, Japan
Masashi Mikami
Affiliation:
National Institute of Advanced Industrial Science and Technology, Midorigaoka, Ikeda, Osaka 563-8577, Japan; and CREST, Japan Science and Technology Agency, Ikeda, Osaka 563-8577, Japan
Ryoji Funahashi*
Affiliation:
National Institute of Advanced Industrial Science and Technology, Midorigaoka, Ikeda, Osaka 563-8577, Japan; and CREST, Japan Science and Technology Agency, Ikeda, Osaka 563-8577, Japan
Daniel Chateigner
Affiliation:
CRISMAT-ENSICAEN Laboratory, UMR CNRS 6508, 14050 Caen Cedex, France
*
a) Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

Bi–Ca–Co–O polycrystalline materials with a layered structure were prepared. The synthesis of the sintered specimens from two starting compositions, Bi1.8Ca2Co2Oxand Bi2.5Ca2.5Co2Ox, revealed the latter is preferentially formed at high temperature(850 °C). The increase in sintering time was shown by growth of large platelike grains (up to 50 μm in diameter and several micrometers in thickness). The reaction mechanisms during the heat treatment and the preferential formation of the Bi2.5Ca2.5Co2Ox phase were observed by x-ray diffraction, thermogravimetry–differential thermal analysis, and scanning electron microscopy. These techniques supposed the presence of a liquid phase at high temperature, origin of a highly kinetic phase formation, and the growth of large grains. Interestingly the liquid phase reaction promotes an efficient stacking and sliding of grains during hot-forging treatment, and highly (00l) oriented materials were prepared. A relationship between thermoelectric performance, texture strength, and microstructure is clarified.

Keywords

LayeredTextureThermoelectricity
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 1002 - 1008
Copyright
Copyright © Materials Research Society 2005

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. Terasaki, I., Sasago, Y. and Uchinokura, K.: Large thermoelectric power in NaCo2O4 single crystals. Phys. Rev. B 56 R12685 (1997).CrossRefGoogle Scholar
2. Li, S., Funahashi, R., Matsubara, I., Ueno, K. and Yamada, H.: High temperature thermoelectric properties of oxide Ca9Co12O28 . J. Mater. Chem. 9, 1659 (1999).CrossRefGoogle Scholar
3. Masset, A.C., Michel, C., Maignan, A., Hervieu, M., Toulemonde, O., Studer, F., Raveau, B. and Hejtmanek, J.: Misfit-layered cobaltite with an anisotropic giant magnetoresistance: Ca3Co4O9 . Phys. Rev. B 62, 166 (2000).CrossRefGoogle Scholar
4. Funahashi, R., Matsubara, I., Ikuta, H., Takeuchi, T., Mizutani, U. and Sodeoka, S.: An oxide single crystal with high thermoelectric performance in air. Jpn. J. Appl. Phys. 39, L1127 (2000).CrossRefGoogle Scholar
5. Funahashi, R., Matsubara, I. and Sodeoka, S.: Thermoelectric properties of Bi2Sr2Co2O x polycrystalline materials. Appl. Phys. Lett. 76, 2385 (2000).CrossRefGoogle Scholar
6. Maignan, A., Hébert, S., Hervieu, M., Michel, C., Pelloquin, D. and Khomskii, D.: Magnetoresistance and magnetothermopower properties of Bi/Ca/Co/O and Bi(Pb)/Ca/Co/O misfit layer cobaltites. J. Phys. Condens. Matter 15, 2711 (2003).CrossRefGoogle Scholar
7. Itahara, H., Xia, C., Sugiyama, J. and Tani, T.: Fabrication of textured thermoelectric layered cobaltites with various rock salt-type layers by using β–Co(OH)2 platelets as reactive templates. J. Mater. Chem. 14, 61 (2004).CrossRefGoogle Scholar
8. Guilmeau, E., Chateigner, D. and Noudem, J.G.: Sinter-forging of strongly textured Bi2223 discs with large J cs: nucleation and growth of Bi2223 from Bi2212 crystallites. Supercond. Sci. Technol. 15, 1436 (2002).CrossRefGoogle Scholar
9. Guilmeau, E., Funahashi, R., Mikami, M., Chong, K. and Chateigner, D.: Thermoelectric properties–texture relationship in highly oriented Ca3Co4O9 composites. Appl. Phys. Lett. 85, 1490 (2004).CrossRefGoogle Scholar
10. Mikami, M., Funahashi, R., Yoshimura, M., Mori, Y. and Sasaki, T.: High-temperature thermoelectric properties of single-crystal Ca3Co2O6 . J. Appl. Phys. 94, 6579 (2003).CrossRefGoogle Scholar
11. Tarascon, J-M., Ramesh, R., Barboux, P., Hedge, M.S., Hull, G.W., Greene, L.H., Giroud, M., LePage, Y., McKinnon, W.R., Waszcak, J.V. and Schneemeyer, L.F.: New non-superconducting layered Bi-oxide phases of formula Bi2M3Co2O y containing Co instead of Cu. Solid State Commun. 71, 663 (1989).CrossRefGoogle Scholar
12. Hervieu, M., Boullay, Ph., Michel, C., Maignan, A. and Raveau, B.: A new family of misfit layered oxides with double rock salt layers Bi α (A 0.75± ε Bi0.25± ε O)(3+3 x )/2 MO2(A= Ca, Sr and M= Co, Cr). J. Solid State Chem. 142, 305 (1999).CrossRefGoogle Scholar
13. Burton, B.P., Rawn, C.J., Roth, R.S. and Hwang, N.M.: Phase equilibria and crystal chemistry in portions of the system SrO–CaO–Bi2O3–CuO, Part IV—The system CaO–Bi2O3–CuO. J. Res. Natl. Inst. Stand. Technol. 98, 469 (1993).CrossRefGoogle ScholarPubMed
14. Guilmeau, E., Chateigner, D. and Noudem, J.G.: Effect of the precursor powders on the final properties of hot-forged Bi2223 textured discs. Supercond. Sci. Technol. 16, 484 (2003).CrossRefGoogle Scholar
15. Morgan, P., Piche, J.D. and Housley, R.M.: Use of a thermal gradient to study the role of liquid phase during the formation of bismuth high temperature superconductors. Physica C 191, 179 (1992).CrossRefGoogle Scholar