Thermoelectric properties of Bi and Cu co-doped Ca3Co2O6single crystals |
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| Authors: | Junichi Takahashi Masahiko Shimada Kouta Iwasaki Hisanori Yaname |
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| Affiliation: | (1) Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;(2) Akita National College of Technology, 1-1 Bunkyo-cho, Iijima, Akita 011-8511, Japan;(3) Department of Quantum Engineering, Nagoya University, Furo-cho Chikusa, Nagoya 464-8603, Japan;(4) Center for Interdisciplinary Research, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8578, Japan |
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| Abstract: | Single crystals of Bi and Cu-doped Ca3Co2O6were synthesized in a molten K2CO3flux. Using an obtained single crystal of (Ca0.985(5)Bi0.015(5))3(Co0.990(3)Cu0.010(3))2O6elongated to the c-axis direction of the crystal structure, the electric resistivity (ρ) and Seebeck coefficient (S) were measured from room temperature to over 1000 K in air. The single crystal showed p-type semiconducting behavior with ρ values of 1.8 Ω cm at 303 K and 0.017 Ω cm at 1000 K. The S values were +254 μ VK− 1 at 325 K, +360 μ VK− 1 at 420 K, and +214 μ VK− 1 at 1000 K. The power factor (S
2
ρ
− 1) increased with an increase of temperature and attained 2.70 × 10− 4 Wm− 1K− 2 at 1000 K. |
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| Keywords: | Thermoelectric materials Ca3Co2O6 Single crystals Power factor |
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