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Applied Physics Letters / Volume 96 / Issue 14 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 96, 141905 (2010); http://dx.doi.org/10.1063/1.3385264 (3 pages)

Correlation of oxygen vacancy concentration and thermoelectric properties in Na0.73CoO2−δ

P. H. Tsai1, T. Norby2, T. T. Tan1, R. Donelson3, Z. D. Chen3, and S. Li1

1School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
2Department of Chemistry, The University of Oslo, SMN, FERMiO, Gaustadalleen 21, NO-0349 Oslo, Norway
3Division of Process Science and Technology, CSIRO, Clayton, Victoria 3168, Australia

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(Received 14 January 2010; accepted 11 March 2010; published online 6 April 2010)

In this work, oxygen vacancies were precisely controlled by manipulating oxygen partial pressure and the oxygen partial pressure dependence of thermoelectric properties of polycrystalline Na0.73CoO2−δ was investigated. The results suggest that resistivity and thermopower augment simultaneously with increasing concentration of oxygen vacancies δ due to the recombination of electrons and holes and average Co valence state. The total thermal conductivity can be reduced by minimizing δ. The dimensionless figure of merit was strongly affected by δ at lower operating temperature. The experimental results provide guideline for the variation in performance of this material system under different processing and operating environments.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

electrical resistivity, electron-hole recombination, sodium compounds, thermal conductivity, thermoelectric power, vacancies (crystal)

PACS

  • 61.72.jd

    Vacancies

  • 72.20.Pa

    Thermoelectric and thermomagnetic effects

  • 66.70.Lm

    Other systems such as ionic crystals, molecular crystals, nanotubes, etc.

  • 72.20.Jv

    Charge carriers: generation, recombination, lifetime, and trapping

  • 72.80.Sk

    Insulators

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3385264

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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