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

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

Access to Document

10.1007/s11664-010-1135-2

Cite this

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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.",

keywords = "CuFeO, CuMnO, solid solution, thermal conductivity",

author = "T. Nozaki and K. Hayashi and T. Kajitani",

note = "Funding Information: This research was partially supported by a Grant-in-Aid for Scientific Research and for JSPS Fellows of the Ministry of Education, Science, Sports, and Culture.",

year = "2010",

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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.

N1 - Funding Information: This research was partially supported by a Grant-in-Aid for Scientific Research and for JSPS Fellows of the Ministry of Education, Science, Sports, and Culture.

PY - 2010/9

Y1 - 2010/9

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.

KW - CuFeO

KW - CuMnO

KW - solid solution

KW - thermal conductivity

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