Nanostructured Nb-substituted CaMnO3 n-type thermoelectric material prepared in a continuous process by ultrasonic spray combustion

Abstract

One way to further optimize the thermoelectric properties toward a higher ZT is a temperature stable nanoengineering of materials, where the thermal conductivity is reduced by increasing the phonon scattering at the grain boundaries. To study this, Nb-substituted CaMnO3 perovskite-type material was synthesized by ultrasonic spray combustion (USC). The grain growth has been characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Finally, the thermoelectric properties of compacted and sintered bulk samples from powder prepared by a continuous scalable USC process were measured up to 1050 K. The thermoelectric legs were prepared by an adapted sintering process. Here, a compromise between enhanced porosity to reduce the thermal conductivity and securing of mechanical stability and low resistivity should be obtained. Based on the grain growth mechanisms, an advanced sintering process for additional interconnection of the particles without particle growth is needed to further increase the thermoelectric performance.

This is a preview of subscription content, access via your institution.

TABLE I.
TABLE II.
FIG. 1.
FIG. 2.
FIG. 3.
FIG. 4.
FIG. 5.
FIG. 6.
FIG. 7.
FIG. 8.
FIG. 9.
FIG. 10.
FIG. 11.
FIG. 12.
FIG. 13.

REFERENCES

  1. 1.

    S.S. Kim, F. Yin, and Y. Kagawa: Thermoelectricity for crystallographic anisotropy controlled Bi–Te based alloys and p–n modules. J. Alloy. Comp. 419, 306 (2006).

    CAS  Article  Google Scholar 

  2. 2.

    P. Pichanusakorn and P. Bandaru: Nanostructured thermoelectrics. Mater. Sci. Eng., R 67, 19 (2010).

    Article  Google Scholar 

  3. 3.

    A. Weidenkaff: Preparation and application of nanostructured perovskite phases. Adv. Eng. Mater. 6, 709 (2004).

    CAS  Article  Google Scholar 

  4. 4.

    E. Krupicka, A. Reller, and A. Weidenkaff: Morphology of nanoscaled LaMO3-particles (M=Mn, Fe, Co, Ni) derived by citrate precursors in aqueous and alcoholic solvents. Cryst. Eng. 5, 195 (2002).

    CAS  Article  Google Scholar 

  5. 5.

    L. Bocher, R. Robert, M.H. Aguirre, S. Malo, S. Hébert, A. Maignan, and A. Weidenkaff: Thermoelectric and magnetic properties of perovskite-type manganate phases synthesised by a ultrasonic spray combustion (USC). J. Sol. State Sci. 10, 496 (2008).

    CAS  Article  Google Scholar 

  6. 6.

    A.L. Patterson: The Scherrer formula for x-ray particle size determination. Phys. Rev. 56, 978 (1939).

    CAS  Article  Google Scholar 

  7. 7.

    J. Blumm: Thermophysical properties characterization of zirconia prior to, during and after the sintering process. CFI-Ceram. Forum Int. 82, E32 (2005).

    CAS  Google Scholar 

  8. 8.

    L. Bocher, M.H. Aguirre, R. Robert, D. Logvinovich, S. Bakardjieva, J. Hejtmanek, and A. Weidenkaff: High-temperature stability, structure and thermoelectric properties of CaMn1-xNbxO3 phases. Acta Mater. 57, 5667 (2009).

    CAS  Article  Google Scholar 

  9. 9.

    L. Bocher, M.H. Aguirre, D. Logvinovich, A. Shkabko, M. Trottmann, and A. Weidenkaff: CaMnxNb1-xO3 perovskite-type phases as promising new high temperature thermoelectric materials. Inorg. Chem. 47, 8077 (2008).

    CAS  Article  Google Scholar 

  10. 10.

    P. Tomeš, M. Trottmann, C. Suter, M.H. Aguirre, A. Steinfeld, P. Haueter, and A. Weidenkaff: Thermoelectric oxide modules (TOMs) for the direct conversion of simulated solar radiation into electrical energy. Materials 3, 2801 (2010).

    Article  Google Scholar 

  11. 11.

    X. Song, M. Xie, F. Zhou, G. Jia, X. Hao, and S. An: High-temperature thermal properties of yttria fully stabilized zirconia ceramics. J. Rare Earths 29, 155 (2011).

    CAS  Article  Google Scholar 

  12. 12.

    K.W. Schlichting, N.P. Padture, and P.G. Klemens: Thermal conductivity of dense and porous yttria-stabilized zirconia. J. Mater. Sci. 36, 3003 (2001).

    CAS  Article  Google Scholar 

Download references

ACKNOWLEDGMENTS

The authors acknowledge Nico Studer for the great work on the USC, Songhak Yoon for help in the XRD measurements, Oliver Brunko for the help in sample preparation, Ye Lu for the BET experiments, Lassi Karvonen for help and discussion about the heat treatment of the samples, and finally Petr Tomeš for help with the data treatment.

Author information

Affiliations

Authors

Corresponding author

Correspondence to Anke Weidenkaff.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Populoh, S., Trottmann, M., Aguire, M.H. et al. Nanostructured Nb-substituted CaMnO3 n-type thermoelectric material prepared in a continuous process by ultrasonic spray combustion. Journal of Materials Research 26, 1947–1952 (2011). https://doi.org/10.1557/jmr.2011.140

Download citation