The influence of α- And γ-Al2O3 phases on the thermoelectric properties of Al-doped ZnO

Li Han, Ngo Van Nong, Le Thanh Hung, Tim Holgate, Nini Pryds, Michitaka Ohtaki, Søren Linderoth

    研究成果: ジャーナルへの寄稿記事

    27 引用 (Scopus)

    抄録

    A systematic investigation on the microstructure and thermoelectric properties of Al-doped ZnO using α- and γ-Al2O 3 as dopants was conducted in order to understand the doping effect and its mechanism. The samples were prepared by the spark plasma sintering technique from precursors calcined at various temperatures. Clear differences in microstructure and thermoelectric properties were observed between the samples doped with α- and γ-Al2O3. At any given calcination temperature, γ-Al2O3 resulted in the formation of a larger amount of the ZnAl2O4 phase in the Al-doped ZnO samples. The average grain size was found to be smaller for the γ-Al2O3-doped samples than that for the α-Al2O3-doped ones under the same sintering condition. It is proposed that the ZnAl2O4 phase is the reason for the observed suppression of grain growth and also for the slightly reduced lattice thermal conductivity exhibited by these samples. The γ-Al2O3 promoted the substitution for donor impurities in ZnO, thus resulting in shrinkage of the unit cell volume and an increase in the electrical conductivity compared with the α-Al 2O3-doped ZnO. At a calcination temperature of 1173 K, the γ-Al2O3-doped sample showed a ZT value of 0.17 at 1173 K, which is 27% higher than that of the α-Al2O 3-doped sample.

    元の言語英語
    ページ(範囲)291-296
    ページ数6
    ジャーナルJournal of Alloys and Compounds
    555
    DOI
    出版物ステータス出版済み - 4 5 2013

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    Calcination
    Doping (additives)
    Microstructure
    Spark plasma sintering
    Grain growth
    Temperature
    Thermal conductivity
    Substitution reactions
    Sintering
    Impurities
    Electric Conductivity

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

    これを引用

    The influence of α- And γ-Al2O3 phases on the thermoelectric properties of Al-doped ZnO. / Han, Li; Nong, Ngo Van; Hung, Le Thanh; Holgate, Tim; Pryds, Nini; Ohtaki, Michitaka; Linderoth, Søren.

    :: Journal of Alloys and Compounds, 巻 555, 05.04.2013, p. 291-296.

    研究成果: ジャーナルへの寄稿記事

    Han, Li ; Nong, Ngo Van ; Hung, Le Thanh ; Holgate, Tim ; Pryds, Nini ; Ohtaki, Michitaka ; Linderoth, Søren. / The influence of α- And γ-Al2O3 phases on the thermoelectric properties of Al-doped ZnO. :: Journal of Alloys and Compounds. 2013 ; 巻 555. pp. 291-296.
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