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Anisotropy of thermoelectric composites 0.7 Ca3Co4O9/0.3 Bi2Ca2Co2Oy

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Abstract

The anisotropy of thermoelectric composites 0.7 Ca3Co4O9/0.3 Bi2Ca2Co2Oy were investigated. The X-ray diffraction analysis and the micro-morphology characterization in different planes were conducted. The results show in the plane perpendicular to the hot press direction, the diffraction directions are all along (00l), and the diffraction intensity is the strongest. The composites shows layered structure due to the plat-like Ca3Co4O9 sheets stacking along the hot press direction. The electrical resistivity ρ, Seebeck coefficient S and thermal conductivity κ in different directions were measured. The results show the thermoelectric parameters are strong direction dependence. With the measured direction deviating from the hot press direction, the electrical resistivity ρ and the thermal conductivity κ decline monotonically. Meanwhile, the ρ (θ = 0)/ρ (θ = 90) (θ defined as the angle between the measured direction and the hot press direction) decreases as the temperature rises, however, the κ (θ = 0)/κ (θ = 90) almost keeps constant over the whole temperature range. The Seebeck coefficient reaches the maximum when θ = 22.5 or 67.5.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xihua University, No 999, Jinzhou Road, Chengdu, 610039, Sichuan, China

    N. B. Feng, Y. W. Liao, S. Y. Li, Y. He & Y. R. Jin

  2. Graduate School & Faculty of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan

    Y. Lu

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  1. N. B. Feng
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  2. Y. W. Liao
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Feng, N.B., Liao, Y.W., Li, S.Y. et al. Anisotropy of thermoelectric composites 0.7 Ca3Co4O9/0.3 Bi2Ca2Co2Oy. J Mater Sci: Mater Electron 30, 19471–19476 (2019). https://doi.org/10.1007/s10854-019-02312-x

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  • DOI: https://doi.org/10.1007/s10854-019-02312-x

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