Crystal structure and thermoelectric properties of the composite crystal [(Ca1-xSrx)2CoO3]pCoO2

Y. Miyazaki; T. Miura; Y. Ono; T. Akashi; T. Goto; T. Kajitani

doi:10.1109/ICT.2002.1190306

Crystal structure and thermoelectric properties of the composite crystal [(Ca_1-xSr_x)₂CoO₃]_pCoO₂

Y. Miyazaki, T. Miura, Y. Ono, T. Akashi, T. Goto, T. Kajitani

研究成果: Conference contribution

9 被引用数 (Scopus)

抄録

Polycrystalline samples of [(Ca_1-xSr_x)₂CoO₃]_pCoO₂ with 0 ≤5 x≤0.25 have been synthesized at 920°C in flowing oxygen gas. The modulated crystal structure of the samples has been determined in accordance with a four-dimensional formalism from powder neutron diffraction data. With increasing x, the modulation amplitudes in Co-Co conduction paths become less marked. The non-doped sample (x=0) exhibits the resistivity ρ =15 mΩcm and the thermoelectric power S=130 μV/K at 300 K. Both the ρ and S values decrease with x but the decrease in ρ values is steeper than that of the S values. The power factor S²/ρ increases with x, from 1.1×10^-4 W/mK² (x=0) to 1.4×10^-4 W/mK² (x=0.20) at 300 K. This improvement in thermoelectric performance can be explained in terms of the reduction of displacive modulation of the Co-Co conduction paths in the CoO₂ sheets.

本文言語	English
ホスト出版物のタイトル	Proceedings ICT 2002
ホスト出版物のサブタイトル	21st International Conference on Thermoelectrics
出版社	Institute of Electrical and Electronics Engineers Inc.
ページ	226-229
ページ数	4
ISBN（電子版）	0780376838
DOI	https://doi.org/10.1109/ICT.2002.1190306
出版ステータス	Published - 2002
イベント	21st International Conference on Thermoelectrics, ICT 2002 - Long Beach, United States 継続期間: 2002 8月 25 → 2002 8月 29

出版物シリーズ

名前	International Conference on Thermoelectrics, ICT, Proceedings
巻	2002-January

Other

Other	21st International Conference on Thermoelectrics, ICT 2002
国/地域	United States
City	Long Beach
Period	02/8/25 → 02/8/29

ASJC Scopus subject areas

凝縮系物理学
電子工学および電気工学

文献へのアクセス

10.1109/ICT.2002.1190306

他のファイルとリンク

引用スタイル

Miyazaki, Y., Miura, T., Ono, Y., Akashi, T., Goto, T., & Kajitani, T. (2002). Crystal structure and thermoelectric properties of the composite crystal [(Ca_1-xSr_x)₂CoO₃]_pCoO₂. In Proceedings ICT 2002: 21st International Conference on Thermoelectrics (pp. 226-229). [1190306] (International Conference on Thermoelectrics, ICT, Proceedings; Vol. 2002-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICT.2002.1190306

Crystal structure and thermoelectric properties of the composite crystal [(Ca_1-xSr_x)₂CoO₃]_pCoO₂. / Miyazaki, Y.; Miura, T.; Ono, Y. その他.

Proceedings ICT 2002: 21st International Conference on Thermoelectrics. Institute of Electrical and Electronics Engineers Inc., 2002. p. 226-229 1190306 (International Conference on Thermoelectrics, ICT, Proceedings; Vol. 2002-January).

研究成果: Conference contribution

Miyazaki, Y, Miura, T, Ono, Y, Akashi, T, Goto, T & Kajitani, T 2002, Crystal structure and thermoelectric properties of the composite crystal [(Ca_1-xSr_x)₂CoO₃]_pCoO₂. in Proceedings ICT 2002: 21st International Conference on Thermoelectrics., 1190306, International Conference on Thermoelectrics, ICT, Proceedings, vol. 2002-January, Institute of Electrical and Electronics Engineers Inc., pp. 226-229, 21st International Conference on Thermoelectrics, ICT 2002, Long Beach, United States, 02/8/25. https://doi.org/10.1109/ICT.2002.1190306

Miyazaki Y, Miura T, Ono Y, Akashi T, Goto T, Kajitani T. Crystal structure and thermoelectric properties of the composite crystal [(Ca_1-xSr_x)₂CoO₃]_pCoO₂. In Proceedings ICT 2002: 21st International Conference on Thermoelectrics. Institute of Electrical and Electronics Engineers Inc. 2002. p. 226-229. 1190306. (International Conference on Thermoelectrics, ICT, Proceedings). doi: 10.1109/ICT.2002.1190306

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