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Journal of Applied Physics / Volume 110 / Issue 12 / ARTICLES / Electronic Structure and Transport

J. Appl. Phys. 110, 123713 (2011); http://dx.doi.org/10.1063/1.3671403 (13 pages)

Tunning of microstructure and thermoelectric properties of Ca3Co4O9 ceramics by high-magnetic-field sintering

Yanan Huang1, Bangchuan Zhao1, Jun Fang2, Ran Ang1, and Yuping Sun1,2

1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
2High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China

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(Received 23 September 2011; accepted 1 November 2011; published online 23 December 2011)

The structural, magnetic, electrical, and thermal transport properties of Ca3Co4O9 ceramics sintered under high magnetic field were investigated. Crystal grain texturing and densification were achieved through cold-pressing and high-magnetic-field sintering techniques. The c-axis of the layered crystal grain was partly oriented along the c-axis of the pressed samples via a cold-pressing technique, and the degree of orientation was further increased while applying the magnetic field in the sample sintering progress. The easy magnetization axis of Ca3Co4O9 polycrystalline ceramics was found to be the c-axis. The room-temperature resistivity along the ab-plane of the sample sintered under 8 T magnetic field was about 30% smaller than that of the sample sintered without magnetic field, and the Seebeck coefficient of the former reached 177.7 μV/K at the room temperature, which is about 50% larger than that of the latter. Consequently, for the sample sintered at 8 T magnetic field, the power factor along the ab-plane was enhanced by about 1.8 times compared to the sample without magnetic field sintering. The obtained result is suggested to originate from the variations of the carrier mobility and spin-orbital degeneracy due to high-magnetic-field sintering in the progress of the sample preparation.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL DETAILS
  3. RESULTS AND DISCUSSION
    1. Textured microstructure
    2. Magnetic properties
    3. Electric transport property
    4. Thermoelectric response
    5. Thermal transport property
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

calcium compounds, carrier mobility, ceramics, colossal magnetoresistance, crystal microstructure, densification, inhomogeneous media, magnetisation, pressing, Seebeck effect, sintering, spin-orbit interactions, texture, thermomagnetic effects

PACS

  • 72.20.Pa

    Thermoelectric and thermomagnetic effects

  • 75.47.Gk

    Colossal magnetoresistance

  • 75.47.Lx

    Magnetic oxides

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 81.05.Je

    Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)

  • 72.20.Fr

    Low-field transport and mobility; piezoresistance

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3671403

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

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

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