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

T. Nozaki, K. Hayashi, T. Kajitani

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)1798-1802
Number of pages5
JournalJournal of Electronic Materials
Volume39
Issue number9
DOIs
Publication statusPublished - 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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