Power factors of late rare earth-doped Ca3Co2O6 oxides

Ngo Van Nong, Michitaka Ohtaki

    研究成果: ジャーナルへの寄稿記事

    13 引用 (Scopus)

    抄録

    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.

    元の言語英語
    ページ(範囲)232-234
    ページ数3
    ジャーナルSolid State Communications
    139
    発行部数5
    DOI
    出版物ステータス出版済み - 8 1 2006

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    Oxides
    Rare earths
    Substitution reactions
    rare earth elements
    oxides
    substitutes
    Seebeck coefficient
    Rare earth elements
    Seebeck effect
    Temperature
    electrical resistivity
    radii

    All Science Journal Classification (ASJC) codes

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

    これを引用

    Power factors of late rare earth-doped Ca3Co2O6 oxides. / Nong, Ngo Van; Ohtaki, Michitaka.

    :: Solid State Communications, 巻 139, 番号 5, 01.08.2006, p. 232-234.

    研究成果: ジャーナルへの寄稿記事

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    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.",
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    AB - 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.

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