Structure and thermoelectric properties of double-perovskite oxides

Sr2-xKxFeMoO6

Tohru Sugahara, Teppei Araki, Michitaka Ohtaki, Katsuaki Suganuma

    研究成果: ジャーナルへの寄稿記事

    12 引用 (Scopus)

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    The thermoelectric properties of the double perovskite-type oxides Sr 2-xKxFeMoO6 were investigated in terms of K-doping at the A site of the oxides. The electrical conductivity, of the oxides showed a metallic behavior, decreasing monotonically from ca. 103 S/cm at room temperature to ca. 102 S/cm at 1250 K. The Seebeck coefficient, S, showed that the oxides are of n-type over the measured temperature range. The absolute value of S increased with increasing temperature. The absolute value of S at 300K increased up to x = 0.2 and then decreased dramatically for x = 0.304. The Rietveld refinement of the XRD patterns of the oxides suggested that the increase in orbital degeneracy due to the eased distortion of FeO 6 and MoO6 octahedra at x = 0.2 was responsible for the S maximum at this composition. The power factor, S2, of the oxides increased sharply with increasing K-doping level; the value for Sr 1.6K0.4FeMoO6 was ca. 4.2 × 10 -4W/mK2, which is the highest among all the samples in this study. The thermal conductivity, of the oxides generally decreased from ca. 35W/ mK at room temperature to ca. 24W/ mK at 1100 K. Because the power factor of the oxides increased above 900 K, the dimensionless figure of merit, ZT = S2T/, increased dramatically above 900 K. The largest ZT value of 0.24 was observed for Sr1.6K0.4FeMoO6 at 1250 K.

    元の言語英語
    ページ(範囲)211-216
    ページ数6
    ジャーナルJournal of the Ceramic Society of Japan
    120
    発行部数1402
    DOI
    出版物ステータス出版済み - 1 1 2012

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    Perovskite
    Oxides
    oxides
    Doping (additives)
    Temperature
    Rietveld refinement
    Seebeck coefficient
    perovskite
    room temperature
    Seebeck effect
    figure of merit
    Thermal conductivity
    thermal conductivity
    orbitals
    electrical resistivity
    temperature
    Chemical analysis

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry

    これを引用

    Structure and thermoelectric properties of double-perovskite oxides : Sr2-xKxFeMoO6. / Sugahara, Tohru; Araki, Teppei; Ohtaki, Michitaka; Suganuma, Katsuaki.

    :: Journal of the Ceramic Society of Japan, 巻 120, 番号 1402, 01.01.2012, p. 211-216.

    研究成果: ジャーナルへの寄稿記事

    Sugahara, Tohru ; Araki, Teppei ; Ohtaki, Michitaka ; Suganuma, Katsuaki. / Structure and thermoelectric properties of double-perovskite oxides : Sr2-xKxFeMoO6. :: Journal of the Ceramic Society of Japan. 2012 ; 巻 120, 番号 1402. pp. 211-216.
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    abstract = "The thermoelectric properties of the double perovskite-type oxides Sr 2-xKxFeMoO6 were investigated in terms of K-doping at the A site of the oxides. The electrical conductivity, of the oxides showed a metallic behavior, decreasing monotonically from ca. 103 S/cm at room temperature to ca. 102 S/cm at 1250 K. The Seebeck coefficient, S, showed that the oxides are of n-type over the measured temperature range. The absolute value of S increased with increasing temperature. The absolute value of S at 300K increased up to x = 0.2 and then decreased dramatically for x = 0.304. The Rietveld refinement of the XRD patterns of the oxides suggested that the increase in orbital degeneracy due to the eased distortion of FeO 6 and MoO6 octahedra at x = 0.2 was responsible for the S maximum at this composition. The power factor, S2, of the oxides increased sharply with increasing K-doping level; the value for Sr 1.6K0.4FeMoO6 was ca. 4.2 × 10 -4W/mK2, which is the highest among all the samples in this study. The thermal conductivity, of the oxides generally decreased from ca. 35W/ mK at room temperature to ca. 24W/ mK at 1100 K. Because the power factor of the oxides increased above 900 K, the dimensionless figure of merit, ZT = S2T/, increased dramatically above 900 K. The largest ZT value of 0.24 was observed for Sr1.6K0.4FeMoO6 at 1250 K.",
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    T1 - Structure and thermoelectric properties of double-perovskite oxides

    T2 - Sr2-xKxFeMoO6

    AU - Sugahara, Tohru

    AU - Araki, Teppei

    AU - Ohtaki, Michitaka

    AU - Suganuma, Katsuaki

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    N2 - The thermoelectric properties of the double perovskite-type oxides Sr 2-xKxFeMoO6 were investigated in terms of K-doping at the A site of the oxides. The electrical conductivity, of the oxides showed a metallic behavior, decreasing monotonically from ca. 103 S/cm at room temperature to ca. 102 S/cm at 1250 K. The Seebeck coefficient, S, showed that the oxides are of n-type over the measured temperature range. The absolute value of S increased with increasing temperature. The absolute value of S at 300K increased up to x = 0.2 and then decreased dramatically for x = 0.304. The Rietveld refinement of the XRD patterns of the oxides suggested that the increase in orbital degeneracy due to the eased distortion of FeO 6 and MoO6 octahedra at x = 0.2 was responsible for the S maximum at this composition. The power factor, S2, of the oxides increased sharply with increasing K-doping level; the value for Sr 1.6K0.4FeMoO6 was ca. 4.2 × 10 -4W/mK2, which is the highest among all the samples in this study. The thermal conductivity, of the oxides generally decreased from ca. 35W/ mK at room temperature to ca. 24W/ mK at 1100 K. Because the power factor of the oxides increased above 900 K, the dimensionless figure of merit, ZT = S2T/, increased dramatically above 900 K. The largest ZT value of 0.24 was observed for Sr1.6K0.4FeMoO6 at 1250 K.

    AB - The thermoelectric properties of the double perovskite-type oxides Sr 2-xKxFeMoO6 were investigated in terms of K-doping at the A site of the oxides. The electrical conductivity, of the oxides showed a metallic behavior, decreasing monotonically from ca. 103 S/cm at room temperature to ca. 102 S/cm at 1250 K. The Seebeck coefficient, S, showed that the oxides are of n-type over the measured temperature range. The absolute value of S increased with increasing temperature. The absolute value of S at 300K increased up to x = 0.2 and then decreased dramatically for x = 0.304. The Rietveld refinement of the XRD patterns of the oxides suggested that the increase in orbital degeneracy due to the eased distortion of FeO 6 and MoO6 octahedra at x = 0.2 was responsible for the S maximum at this composition. The power factor, S2, of the oxides increased sharply with increasing K-doping level; the value for Sr 1.6K0.4FeMoO6 was ca. 4.2 × 10 -4W/mK2, which is the highest among all the samples in this study. The thermal conductivity, of the oxides generally decreased from ca. 35W/ mK at room temperature to ca. 24W/ mK at 1100 K. Because the power factor of the oxides increased above 900 K, the dimensionless figure of merit, ZT = S2T/, increased dramatically above 900 K. The largest ZT value of 0.24 was observed for Sr1.6K0.4FeMoO6 at 1250 K.

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