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

T. Nozaki, K. Hayashi, T. Kajitani

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34 Citations (Scopus)


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
Issue number9
Publication statusPublished - 2010 Sept


  • CuFeO
  • CuMnO
  • solid solution
  • thermal conductivity


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