Electrical transport properties and high-temperature thermoelectric performance of (Ca0.9M0.1)MnO3 (M = Y, La, Ce, Sm, In, Sn, Sb, Pb, Bi)

Michitaka Ohtaki, Hisako Koga, Tsutomu Tokunaga, Koichi Eguchi, Hiromichi Arai

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    Abstract

    The electrical transport properties of (Ca0.9M0.1)MnO3(M = Y, La, Ce, Sm, In, Sn, Sb, Pb, Bi) are investigated in terms of a new material for high-temperature thermoelectric conversion. The substitution at the Ca site causes a marked increase in the electrical conductivity σ, along with a moderate decrease in the absolute value of the Seebeck coefficient S. The plots of log σT vs 1/T show a negative linear relation, indicating that hopping conduction occurs in these oxides. The σ values at room temperature increase with increasing ionic radii of the cation substituents, implying an increase in the carrier mobility due to larger intersite distance for hopping. The sample of (Ca0.9Bi0.1)MnO3 attains the largest power factor, 2.8 × 10-4/W m-1K-2, at 800°C and leads to the figure of merit 0.7-0.75 × 10-4K-1 over the wide range of temperatures 600-900°C. The oxide shows a maximum ZT value of 0.085 at 900°C.

    Original languageEnglish
    Pages (from-to)105-111
    Number of pages7
    JournalJournal of Solid State Chemistry
    Volume120
    Issue number1
    DOIs
    Publication statusPublished - Nov 15 1995

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Inorganic Chemistry
    • Materials Chemistry

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