Thermoelectric properties of double-perovskite oxide Sr2-xM xFeMoO6 [M = Ba, La)

Tohra Sugahara, Michitaka Ohtaki, Takeshi Souma

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    Doping effects for the A-site in double-perovskite type oxide Sr 2-xMxFeMoO6 (M = Ba, La) are investigated on the thermoelectric properties of the oxides. The Seebeck coefficient, S, shows that all the samples of both Ba- and La-doped Sr2FeMoO6 systems are n-type over the measured temperature range. In particular, the power factor, S2 σ, of the Sr2FeMoO6 system largely increased with increasing Ba doping level up to x = 0.3. As a consequence, S2 σ of Sr1.7 Bao 0.3FeMoO6 reached ca. 0.8 × 10-4 W/mK2, the largest value of all the samples in this study. The thermal conductivity, κ, shows a general trend in which the value decreases from ca. 1 W/mK at room temperature to ca. 0.7 W/mK at 1100 K. The dimensionless figure of merit, ZT, of the Badoped samples increased with increasing Ba doping level. Moreover, the ZT value drastically increased above 700 K due to the S2 σ value increasing above 700 K and the κ value decreasing monotonically. As a result, the ZT value of Sr 1.7Ba0.3FeMoO6 reached 0.31 at 1100 K.

    Original languageEnglish
    Pages (from-to)1278-1282
    Number of pages5
    JournalJournal of the Ceramic Society of Japan
    Volume116
    Issue number1360
    DOIs
    Publication statusPublished - Dec 2008

    All Science Journal Classification (ASJC) codes

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

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