Composition-Dependent Thermoelectric Properties of (PbTe)<SUB>100−<I>x</I></SUB>(Bi<SUB>2</SUB>Te<SUB>3</SUB>-Sb<SUB>2</SUB>Te<SUB>3</SUB>)<I><SUB>x</SUB></I> (0.1<I>≤x≤</I>5)

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  • Zhu Pinwen
    Eco-material Research Center, National Institute for Materials Science National Lab of Superhard Materials, Jilin University
  • Imai Yoshio
    Eco-material Research Center, National Institute for Materials Science
  • Isoda Yukihiro
    Eco-material Research Center, National Institute for Materials Science
  • Shinohara Yoshikazi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Jia Xiaopeng
    National Lab of Superhard Materials, Jilin University
  • Zou Guangtian
    National Lab of Superhard Materials, Jilin University

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Other Title
  • Composition-Dependent Thermoelectric Properties of (PbTe)100-x(Bi2Te3-Sb2Te3)x(0.1≦x≦5)
  • Composition Dependent Thermoelectric Properties of PbTe 100 x Bi2Te3 Sb2Te3 x 0 1 x 5
  • Composition-Dependent Thermoelectric Properties of (PbTe)<SUB>100&minus;<I>x</I></SUB>(Bi<SUB>2</SUB>Te<SUB>3</SUB>-Sb<SUB>2</SUB>Te<SUB>3</SUB>)<I><SUB>x</SUB></I> (0.1<I>&le;x&le;</I>5)

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Abstract

We report room-temperature thermoelectric properties of polycrystalline (PbTe)100−x(Bi2Te3-Sb2Te3)x (0.1≤x≤5). At x≤0.25, with a decrease of x, the electrical resistivity increases dramatically whereas the Seebeck coefficient and the thermal conductivity nearly keep constant. At x≥0.5, the electrical conductivity, the thermal conductivity and the Seebeck coefficient in absolute value slightly decrease with increasing x. It is found that, the thermal conductivity of the PbTe sample with Bi2Te3 and Sb2Te3 as the sources of dopants is much smaller than that of doping with other dopants at the same carrier concentration. With an increase of x, the figure of merit, Z, which is calculated from the measured quantities, increases at first and then decreases and shows a maximum value of 8.97×10−4 K−1 at x=0.2. This value is several times higher than that of small grain-size PbTe containing other dopants.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 46 (4), 761-764, 2005

    The Japan Institute of Metals and Materials

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