Scanning Transmission Electron Microscopy and Thermoelectric Properties of Sr-Doped Misfit Cobalt Oxide

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概要

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• In order to clarify the role of Sr doping in the themoelectric properties of Ca<inf>3</inf>Co<inf>4</inf>O<inf>9</inf>, Ca<inf>3-x</inf>Sr<inf>x</inf>Co<inf>4</inf>O<inf>9</inf>samples were fabricated by uniaxial compression molding and sintering in atmosphere. Their thermoelectric properties and atomic-scale structures were investigated. For x<0.3, the dimensionless figure of merit (ZT) increases with x through a decrease in the thermal conductivity \kappa despite the nearly constant Seebeck coefficient \alpha and electrical resistivity \rho. Scanning transmission electron microscopy images and energy-dispersive X-ray spectroscopy maps have revealed that Sr mainly substitutes in the Ca site in the rocksalt layer. These results suggest that Sr doping enhances ZT by decreasing \kappa in the rocksalt layer, but it does not significantly affect electrical properties because it is an isovalent substitution.

• 2013-07-25

著者

• Ikuhara Yuichi

  Institute Of Engineering Innovation School Of Engineering The University Of Tokyo

• Sato Yukio

  Institute Of Engineering Innovation The University Of Tokyo

• Yamaguchi Takahiro

  Graduate School Of Agricultural And Life Sciences University Of Tokyo

• Sato Yukio

  Institute of Engineering Innovation, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Morimura Takao

  Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan

• Hasaka Masayuki

  Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan

• Yamaguchi Takahiro

  Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan

• Ikuhara Yuichi

  Institute of Engineering Innovation, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• IKUHARA Yuichi

  Institute of Engeering Innovation, School of Engineering, The University of Tokyo

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