Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods

Kenji Sugiura; Hiromichi Ohta; Kenji Nomura; Tomohiro Saito; Yuichi Ikuhara; Masahiro Hirano; Hideo Hosono; Kunihito Koumoto

doi:10.1109/ICT.2006.331290

Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods

Kenji Sugiura, Hiromichi Ohta, Kenji Nomura, Tomohiro Saito, Yuichi Ikuhara, Masahiro Hirano, Hideo Hosono, Kunihito Koumoto

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

Epitaxial film of a layered cobalt oxide, Ca₃Co ₄O₉, was fabricated on a (0001)-face of α-Al ₂O₃ substrate by a topotactic ion exchange method using a Na_0.8CoO₂ epitaxial film as a precursor. High-resolution X-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca₃Co₄O₉ with stepped & terraced surface morphology. The film exhibits a high electrical conductivity of 2.95 × 10² Scm^-1 and a large Seebeck coefficient of ∼+125 μVK^-1, which leads to the thermoelectric power factor of 4.5 × 10^-4 Wm^-1K ^-2 at 300 K.

Original language	English
Title of host publication	Proceedings ICT'06 - 25th International Conference on Thermoelectrics
Pages	99-102
Number of pages	4
DOIs	https://doi.org/10.1109/ICT.2006.331290
Publication status	Published - 2006 Dec 1
Event	ICT'06 - 25th International Conference on Thermoelectrics - Vienna, Austria Duration: 2006 Aug 6 → 2006 Aug 10

Publication series

Name	International Conference on Thermoelectrics, ICT, Proceedings

Other

Other	ICT'06 - 25th International Conference on Thermoelectrics
Country	Austria
City	Vienna
Period	06/8/6 → 06/8/10

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1109/ICT.2006.331290

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Sugiura, K., Ohta, H., Nomura, K., Saito, T., Ikuhara, Y., Hirano, M., Hosono, H., & Koumoto, K. (2006). Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods. In Proceedings ICT'06 - 25th International Conference on Thermoelectrics (pp. 99-102). [4133246] (International Conference on Thermoelectrics, ICT, Proceedings). https://doi.org/10.1109/ICT.2006.331290

Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods. / Sugiura, Kenji; Ohta, Hiromichi; Nomura, Kenji; Saito, Tomohiro; Ikuhara, Yuichi; Hirano, Masahiro; Hosono, Hideo; Koumoto, Kunihito.

Proceedings ICT'06 - 25th International Conference on Thermoelectrics. 2006. p. 99-102 4133246 (International Conference on Thermoelectrics, ICT, Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Sugiura, K, Ohta, H, Nomura, K, Saito, T, Ikuhara, Y, Hirano, M, Hosono, H & Koumoto, K 2006, Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods. in Proceedings ICT'06 - 25th International Conference on Thermoelectrics., 4133246, International Conference on Thermoelectrics, ICT, Proceedings, pp. 99-102, ICT'06 - 25th International Conference on Thermoelectrics, Vienna, Austria, 06/8/6. https://doi.org/10.1109/ICT.2006.331290

Sugiura K, Ohta H, Nomura K, Saito T, Ikuhara Y, Hirano M et al. Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods. In Proceedings ICT'06 - 25th International Conference on Thermoelectrics. 2006. p. 99-102. 4133246. (International Conference on Thermoelectrics, ICT, Proceedings). https://doi.org/10.1109/ICT.2006.331290

Sugiura, Kenji ; Ohta, Hiromichi ; Nomura, Kenji ; Saito, Tomohiro ; Ikuhara, Yuichi ; Hirano, Masahiro ; Hosono, Hideo ; Koumoto, Kunihito. / Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods. Proceedings ICT'06 - 25th International Conference on Thermoelectrics. 2006. pp. 99-102 (International Conference on Thermoelectrics, ICT, Proceedings).

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title = "Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods",

abstract = "Epitaxial film of a layered cobalt oxide, Ca3Co 4O9, was fabricated on a (0001)-face of α-Al 2O3 substrate by a topotactic ion exchange method using a Na0.8CoO2 epitaxial film as a precursor. High-resolution X-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca3Co4O9 with stepped & terraced surface morphology. The film exhibits a high electrical conductivity of 2.95 × 102 Scm-1 and a large Seebeck coefficient of ∼+125 μVK-1, which leads to the thermoelectric power factor of 4.5 × 10-4 Wm-1K -2 at 300 K.",

author = "Kenji Sugiura and Hiromichi Ohta and Kenji Nomura and Tomohiro Saito and Yuichi Ikuhara and Masahiro Hirano and Hideo Hosono and Kunihito Koumoto",

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AU - Sugiura, Kenji

AU - Ohta, Hiromichi

AU - Nomura, Kenji

AU - Saito, Tomohiro

AU - Ikuhara, Yuichi

AU - Hirano, Masahiro

AU - Hosono, Hideo

AU - Koumoto, Kunihito

PY - 2006/12/1

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N2 - Epitaxial film of a layered cobalt oxide, Ca3Co 4O9, was fabricated on a (0001)-face of α-Al 2O3 substrate by a topotactic ion exchange method using a Na0.8CoO2 epitaxial film as a precursor. High-resolution X-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca3Co4O9 with stepped & terraced surface morphology. The film exhibits a high electrical conductivity of 2.95 × 102 Scm-1 and a large Seebeck coefficient of ∼+125 μVK-1, which leads to the thermoelectric power factor of 4.5 × 10-4 Wm-1K -2 at 300 K.

AB - Epitaxial film of a layered cobalt oxide, Ca3Co 4O9, was fabricated on a (0001)-face of α-Al 2O3 substrate by a topotactic ion exchange method using a Na0.8CoO2 epitaxial film as a precursor. High-resolution X-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca3Co4O9 with stepped & terraced surface morphology. The film exhibits a high electrical conductivity of 2.95 × 102 Scm-1 and a large Seebeck coefficient of ∼+125 μVK-1, which leads to the thermoelectric power factor of 4.5 × 10-4 Wm-1K -2 at 300 K.

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