Low-temperature thermoelectric properties of the composite crystal [Ca2CoO3.34]0.614[CoO2]

Yuzuru Miyazaki, Kazutaka Kudo, Megumi Akoshima, Yasuhiro Ono, Yoji Koike, Tsuyoshi Kajitani

Research output: Contribution to journalArticle

282 Citations (Scopus)

Abstract

Electric resistivity, thermoelectric power and thermal conductivity of a polycrystalline sample of the composite crystal [Ca2CoO3.34]0.614[CoO2], also known as Ca3Co4O9, have been measured below 300 K. Metallic conductivity accompanied by large thermoelectric power has been observed down to 50 K. At 300 K, the sample exhibits a thermoelectric power of S = 133 μV·K-1, resistivity of ρ = 15 mΩ·cm and thermal conductivity of κ = 9.8 mW·K-1·cm-1. The resulting dimensionless figure of merit becomes ZT300 = 3.5×10-2, which is comparable to the value reported for a polycrystalline sample of NaCo2O4, indicating that the title compound is a potential candidate for a thermoelectric material.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume39
Issue number6 A
Publication statusPublished - 2000
Externally publishedYes

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Thermoelectric power
conductivity
Crystals
composite materials
Thermal conductivity
Composite materials
thermal conductivity
crystals
electrical resistivity
thermoelectric materials
Electric conductivity
figure of merit
Temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Low-temperature thermoelectric properties of the composite crystal [Ca2CoO3.34]0.614[CoO2]. / Miyazaki, Yuzuru; Kudo, Kazutaka; Akoshima, Megumi; Ono, Yasuhiro; Koike, Yoji; Kajitani, Tsuyoshi.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 39, No. 6 A, 2000.

Research output: Contribution to journalArticle

Miyazaki, Yuzuru ; Kudo, Kazutaka ; Akoshima, Megumi ; Ono, Yasuhiro ; Koike, Yoji ; Kajitani, Tsuyoshi. / Low-temperature thermoelectric properties of the composite crystal [Ca2CoO3.34]0.614[CoO2]. In: Japanese Journal of Applied Physics, Part 2: Letters. 2000 ; Vol. 39, No. 6 A.
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AU - Miyazaki, Yuzuru

AU - Kudo, Kazutaka

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AU - Ono, Yasuhiro

AU - Koike, Yoji

AU - Kajitani, Tsuyoshi

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AB - Electric resistivity, thermoelectric power and thermal conductivity of a polycrystalline sample of the composite crystal [Ca2CoO3.34]0.614[CoO2], also known as Ca3Co4O9, have been measured below 300 K. Metallic conductivity accompanied by large thermoelectric power has been observed down to 50 K. At 300 K, the sample exhibits a thermoelectric power of S = 133 μV·K-1, resistivity of ρ = 15 mΩ·cm and thermal conductivity of κ = 9.8 mW·K-1·cm-1. The resulting dimensionless figure of merit becomes ZT300 = 3.5×10-2, which is comparable to the value reported for a polycrystalline sample of NaCo2O4, indicating that the title compound is a potential candidate for a thermoelectric material.

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