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Effect of Ga-substitution for Fe sites of delafossite CuFe1−x Ga x O2 (x = 0.0, 0.1, 0.3, 0.5) on thermal conductivity

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Abstract

This work aimed to study the effect of the Ga3+-substitution of Fe3+ sites in CuFeO2 delafossite on its thermal conductivity. CuFe1−xGaxO2 (x = 0, 0.1, 0.3, and 0.5) samples were synthesized and their phase structure and ionic composition were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The thermal conductivity of the samples was measured at a high temperature range of 298–573 K. The XRD results confirmed that the samples were pure phase delafossite with hexagonal structure space group: \( R\bar{3}{\text{m}} \) while the EDX results showed composition atomic percent of Ga 100 % of x = 0.1, 93 % of x = 0.3 and 90 % of x = 0.5 and the XPS results revealed Cu1+ and Cu2+, Fe2+ and Fe3+, and Ga3+ ion states in the structure. The Ga-substitution decreased the thermal conductivity of the samples below that of non-doped CuFeO2. The high substitution sample (x = 0.5) exhibited the lowest thermal conductivity, 2.5 W/mK at 573 K. Ga substitution into Fe sites affected the lattice thermal conductivity partly through phonon scattering processes arising from mass difference and lattice strain.

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Acknowledgments

C. Ruttanapun would like to thank the Thailand Research Fund (TRF) and King Mongkut’s Institute of Technology Ladkrabang (KMITL) (Contract Number: TRG5880013) for financial support. The author would like to thank Density Laboratory, Mechanical Department, National Institute of Metrology Thailand for provide measured density value of all samples. Additional financial support was provided by a grant from the KMITL Research Fund of King Mongkut’s Institute of Technology Ladkrabang, Ministry of Education, Thailand.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok, 10520, Thailand

    Yuttana Hongaromkij, Chalermpol Rudradawong & Chesta Ruttanapun

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  1. Yuttana Hongaromkij
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  2. Chalermpol Rudradawong
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  3. Chesta Ruttanapun
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Correspondence to Chesta Ruttanapun.

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Hongaromkij, Y., Rudradawong, C. & Ruttanapun, C. Effect of Ga-substitution for Fe sites of delafossite CuFe1−x Ga x O2 (x = 0.0, 0.1, 0.3, 0.5) on thermal conductivity. J Mater Sci: Mater Electron 27, 6438–6444 (2016). https://doi.org/10.1007/s10854-016-4583-5

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  • DOI: https://doi.org/10.1007/s10854-016-4583-5

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