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Anisotropic Heat Conduction in Ion‐Substituted Layered Cobalt Oxides

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Title: Anisotropic Heat Conduction in Ion‐Substituted Layered Cobalt Oxides
Authors: Cho, Hai Jun Browse this author
Takashima, Yugo Browse this author
Nezu, Yukio Browse this author
Onozato, Takaki Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Keywords: anisotropy
epitaxial films
layered cobalt oxides
thermal conductivity
thermoelectric properties
Issue Date: 7-Feb-2020
Publisher: John Wiley & Sons
Journal Title: Advanced Materials Interfaces
Volume: 7
Issue: 3
Start Page: 1901816
Publisher DOI: 10.1002/admi.201901816
Abstract: Layered cobalt oxides, A(x)CoO(2) (A = Li, Na, Ca, and Sr), are attracting attention as thermoelectric materials showing large thermoelectric figure of merit ZT = S-2 sigma T kappa(-1) (S: thermopower, sigma: electrical conductivity, T: absolute temperature, kappa: thermal conductivity) at higher temperatures. Due to the layered structure, A(x)CoO(2) shows strong anisotropy in the thermoelectric properties; both S and sigma are large along the layer though systematic study in kappa is not reported thus far. Here, the anisotropy in kappa of A(x)CoO(2) is shown systematically with the effect of A(x) on kappa. A(x)CoO(2) epitaxial films are fabricated with two different crystallographic orientations with respect to the surface normal to the substrates and the kappa is measured in normal to the substrate. The kappa parallel to the layers (kappa(||)) is 3-6 times larger than that perpendicular to the layers (kappa(perpendicular to)). The kappa(||) decreases with increasing the atomic mass of A(x) though kappa(perpendicular to) is insensitive to it; anisotropy of kappa is controlled by substituting heavier A(x) ions. The present result provides new material design concept for good thermoelectric materials.
Rights: This is the peer reviewed version of the following article: Cho, H. J., Takashima, Y., Nezu, Y., Onozato, T., Ohta, H., Anisotropic Heat Conduction in Ion‐Substituted Layered Cobalt Oxides. Adv. Mater. Interfaces 2020, 7, 1901816, which has been published in final form at . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 太田 裕道

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