Power factors of late rare earth-doped Ca3Co2O6 oxides

Ngo Van Nong, Michitaka Ohtaki

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Polycrystalline samples of (Ca1-xRx)3Co2O6 with R = Gd, Tb, Dy and Ho at x = 0 - 0.1 were synthesized and the effects of rare earth substitution on their thermoelectric properties were investigated. In the high-temperature region, the rare earth substitution resulted in an increase in the Seebeck coefficients (S), and the S values increased with decreasing ionic radius of rare earth elements in the order Gd3+>Tb3+>Dy3+>Ho3+ . In contrast, the influence of rare earth substitution on the electrical resistivity was small. The high-temperature power factor was thereby improved by the late rare earth substitutions, particularly those with Ho3+ for Ca2+. For the Ho-doped samples (x ≤ 0.05), the power factor was significantly improved by increasing Ho concentration.

    Original languageEnglish
    Pages (from-to)232-234
    Number of pages3
    JournalSolid State Communications
    Volume139
    Issue number5
    DOIs
    Publication statusPublished - Aug 1 2006

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry

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