Mn-substitution effect on thermal conductivity of delafossite-type oxide CuFeO 2

T. Nozaki; K. Hayashi; T. Kajitani

doi:10.1007/s11664-010-1135-2

Mn-substitution effect on thermal conductivity of delafossite-type oxide CuFeO ₂

T. Nozaki, K. Hayashi, T. Kajitani

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

We have prepared the CuFe _1-xMn _xO ₂ solid solution to enhance the thermoelectric performance of CuFeO ₂ by reducing its thermal conductivity κ. With increasing x above 0.4, the crystal structure changes from delafossite ( 1̄3m) to crednerite (C2/m). CuFe _0.5Mn _0.5O ₂ exhibits the lowest κ value of 2.28 W/m K at the theoretical density, being about one-quarter of that of the end members, CuFeO ₂ and CuMnO ₂. We discuss the temperature dependence of κ in terms of a classical phonon transport model, and conclude that local structural modulation due to the mixture of undistorted FeO ₆ octahedra and distorted MnO ₆ octahedra in CuFe _1-xMn _xO ₂ leads to the significant reduction of κ.

Original language	English
Pages (from-to)	1798-1802
Number of pages	5
Journal	Journal of Electronic Materials
Volume	39
Issue number	9
DOIs	https://doi.org/10.1007/s11664-010-1135-2
Publication status	Published - 2010 Sep 1

Keywords

CuFeO
CuMnO
solid solution
thermal conductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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title = "Mn-substitution effect on thermal conductivity of delafossite-type oxide CuFeO 2 ",

abstract = "We have prepared the CuFe 1-xMn xO 2 solid solution to enhance the thermoelectric performance of CuFeO 2 by reducing its thermal conductivity κ. With increasing x above 0.4, the crystal structure changes from delafossite ( {\=1}3m) to crednerite (C2/m). CuFe 0.5Mn 0.5O 2 exhibits the lowest κ value of 2.28 W/m K at the theoretical density, being about one-quarter of that of the end members, CuFeO 2 and CuMnO 2. We discuss the temperature dependence of κ in terms of a classical phonon transport model, and conclude that local structural modulation due to the mixture of undistorted FeO 6 octahedra and distorted MnO 6 octahedra in CuFe 1-xMn xO 2 leads to the significant reduction of κ.",

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T1 - Mn-substitution effect on thermal conductivity of delafossite-type oxide CuFeO 2

AU - Nozaki, T.

AU - Hayashi, K.

AU - Kajitani, T.

PY - 2010/9/1

Y1 - 2010/9/1

N2 - We have prepared the CuFe 1-xMn xO 2 solid solution to enhance the thermoelectric performance of CuFeO 2 by reducing its thermal conductivity κ. With increasing x above 0.4, the crystal structure changes from delafossite ( 1̄3m) to crednerite (C2/m). CuFe 0.5Mn 0.5O 2 exhibits the lowest κ value of 2.28 W/m K at the theoretical density, being about one-quarter of that of the end members, CuFeO 2 and CuMnO 2. We discuss the temperature dependence of κ in terms of a classical phonon transport model, and conclude that local structural modulation due to the mixture of undistorted FeO 6 octahedra and distorted MnO 6 octahedra in CuFe 1-xMn xO 2 leads to the significant reduction of κ.

AB - We have prepared the CuFe 1-xMn xO 2 solid solution to enhance the thermoelectric performance of CuFeO 2 by reducing its thermal conductivity κ. With increasing x above 0.4, the crystal structure changes from delafossite ( 1̄3m) to crednerite (C2/m). CuFe 0.5Mn 0.5O 2 exhibits the lowest κ value of 2.28 W/m K at the theoretical density, being about one-quarter of that of the end members, CuFeO 2 and CuMnO 2. We discuss the temperature dependence of κ in terms of a classical phonon transport model, and conclude that local structural modulation due to the mixture of undistorted FeO 6 octahedra and distorted MnO 6 octahedra in CuFe 1-xMn xO 2 leads to the significant reduction of κ.

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