Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals

Wataru Kobayashi; S. Hébert; H. Muguerra; D. Grebille; D. Pelloquin; A. Maignan

doi:10.1109/ICT.2007.4569437

Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals

Wataru Kobayashi^*, S. Hébert, H. Muguerra, D. Grebille, D. Pelloquin, A. Maignan

^*Corresponding author for this work

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

24 Citations (Scopus)

Abstract

Single crystals of different phases of misfit cobalt oxides have been synthesized. Using these materials, the intrinsic power factor has been determined. By combining thermopower 5 and Hall coefficient measurements, we will show how S can be tuned by doping in this family of materials, the doping being strongly dependent on the misfit ratio p=b₁/b₂ ([Bi₂A₂O₄][CoO₂]_b1/b2 with A=Ca, Sr, Ba, b₁/b₂=1.65, 1.82, 1.98). The in-plane resistivity also strongly depends on the doping : the more metallic samples are obtained for the largest carrier concentration, i.e. the smaller S value. The combination of these two factors leads to an important conclusion that the power factor is independent of the doping in these Bi-based materials converging to a unique value of 2.2±0.3 μW/cmK² at room temperature, which is not so trivial. We will discuss the origin of the almost unique value of 2.2±0.3 μW/cmK².

Original language	English
Title of host publication	Proceedings ICT'07 - 26th International Conference on Thermoelectrics
Pages	117-120
Number of pages	4
DOIs	https://doi.org/10.1109/ICT.2007.4569437
Publication status	Published - 2007
Externally published	Yes
Event	ICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of Duration: 2007 Jun 3 → 2007 Jun 7

Other

Other	ICT'07 - 26th International Conference on Thermoelectrics
Country/Territory	Korea, Republic of
City	Jeju
Period	07/6/3 → 07/6/7

ASJC Scopus subject areas

Engineering(all)

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10.1109/ICT.2007.4569437

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Kobayashi, W., Hébert, S., Muguerra, H., Grebille, D., Pelloquin, D., & Maignan, A. (2007). Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals. In Proceedings ICT'07 - 26th International Conference on Thermoelectrics (pp. 117-120). [4569437] https://doi.org/10.1109/ICT.2007.4569437

Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals. / Kobayashi, Wataru; Hébert, S.; Muguerra, H. et al.

Proceedings ICT'07 - 26th International Conference on Thermoelectrics. 2007. p. 117-120 4569437.

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

Kobayashi, W, Hébert, S, Muguerra, H, Grebille, D, Pelloquin, D & Maignan, A 2007, Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals. in Proceedings ICT'07 - 26th International Conference on Thermoelectrics., 4569437, pp. 117-120, ICT'07 - 26th International Conference on Thermoelectrics, Jeju, Korea, Republic of, 07/6/3. https://doi.org/10.1109/ICT.2007.4569437

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title = "Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals",

abstract = "Single crystals of different phases of misfit cobalt oxides have been synthesized. Using these materials, the intrinsic power factor has been determined. By combining thermopower 5 and Hall coefficient measurements, we will show how S can be tuned by doping in this family of materials, the doping being strongly dependent on the misfit ratio p=b1/b2 ([Bi2A2O4][CoO2]b1/b2 with A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98). The in-plane resistivity also strongly depends on the doping : the more metallic samples are obtained for the largest carrier concentration, i.e. the smaller S value. The combination of these two factors leads to an important conclusion that the power factor is independent of the doping in these Bi-based materials converging to a unique value of 2.2±0.3 μW/cmK2 at room temperature, which is not so trivial. We will discuss the origin of the almost unique value of 2.2±0.3 μW/cmK2.",

author = "Wataru Kobayashi and S. H{\'e}bert and H. Muguerra and D. Grebille and D. Pelloquin and A. Maignan",

year = "2007",

doi = "10.1109/ICT.2007.4569437",

language = "English",

isbn = "9781424422623",

pages = "117--120",

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AU - Kobayashi, Wataru

AU - Hébert, S.

AU - Muguerra, H.

AU - Grebille, D.

AU - Pelloquin, D.

AU - Maignan, A.

PY - 2007

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N2 - Single crystals of different phases of misfit cobalt oxides have been synthesized. Using these materials, the intrinsic power factor has been determined. By combining thermopower 5 and Hall coefficient measurements, we will show how S can be tuned by doping in this family of materials, the doping being strongly dependent on the misfit ratio p=b1/b2 ([Bi2A2O4][CoO2]b1/b2 with A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98). The in-plane resistivity also strongly depends on the doping : the more metallic samples are obtained for the largest carrier concentration, i.e. the smaller S value. The combination of these two factors leads to an important conclusion that the power factor is independent of the doping in these Bi-based materials converging to a unique value of 2.2±0.3 μW/cmK2 at room temperature, which is not so trivial. We will discuss the origin of the almost unique value of 2.2±0.3 μW/cmK2.

AB - Single crystals of different phases of misfit cobalt oxides have been synthesized. Using these materials, the intrinsic power factor has been determined. By combining thermopower 5 and Hall coefficient measurements, we will show how S can be tuned by doping in this family of materials, the doping being strongly dependent on the misfit ratio p=b1/b2 ([Bi2A2O4][CoO2]b1/b2 with A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98). The in-plane resistivity also strongly depends on the doping : the more metallic samples are obtained for the largest carrier concentration, i.e. the smaller S value. The combination of these two factors leads to an important conclusion that the power factor is independent of the doping in these Bi-based materials converging to a unique value of 2.2±0.3 μW/cmK2 at room temperature, which is not so trivial. We will discuss the origin of the almost unique value of 2.2±0.3 μW/cmK2.

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BT - Proceedings ICT'07 - 26th International Conference on Thermoelectrics

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Thermoelectric properties in the misfit-layered-cobalt oxides [Bi 2A2O4][CoO2]b1/b2 (A=Ca, Sr, Ba, b1/b2=1.65, 1.82, 1.98) single crystals

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