• DocumentCode
    2482629
  • Title

    Transport properties in (Na,Ca)Co2O4 ceramics

  • Author

    Itoh, T. ; Kawata, T. ; Kitajima, T. ; Terasaki, I.

  • Author_Institution
    Dept. of Appl. Phys., Waseda Univ., Tokyo, Japan
  • fYear
    1998
  • fDate
    24-28 May 1998
  • Firstpage
    595
  • Lastpage
    597
  • Abstract
    The resistivity and thermopower of polycrystalline Na1.1-x CaxCo2O4 were measured and analyzed. Both the quantities increase with x, suggesting that the carrier density is decreased by the substitutions of Ca2+ for Na+. Considering that the temperature dependence of the resistivity show a characteristic change with x, the conduction mechanism is unlikely to come from a simple electron-phonon scattering. As a reference for NaCo2O4, single crystals of a two-dimensional Co oxide Bi2-xPbxM3Co 2O9 (M=Sr and Ba) were studied. The Pb substitution decreases the resistivity, leaving the thermopower nearly intact
  • Keywords
    calcium compounds; carrier density; ceramics; electrical resistivity; sodium compounds; thermoelectric power; NaCaCo2O4; carrier density; ceramics; electron-phonon scattering; polycrystalline sample; resistivity; substitution; temperature dependence; thermopower; Bismuth; Ceramics; Charge carrier density; Conductivity; Copper; Crystals; Grain boundaries; Solid state circuits; Strontium; Temperature dependence;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Thermoelectrics, 1998. Proceedings ICT 98. XVII International Conference on
  • Conference_Location
    Nagoya
  • ISSN
    1094-2734
  • Print_ISBN
    0-7803-4907-5
  • Type

    conf

  • DOI
    10.1109/ICT.1998.740449
  • Filename
    740449
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=2482629