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Structural and transport properties of CuSc₁₋ₓMgₓO[subscript 2+y] delafossites

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  • Transport and structural properties of Mg-doped and O-intercalated sintered powders and polycrystalline films of CuSc₁₋ₓMgₓO[subscript 2+y] are reported. Substitution of Mg for Sc systematically increases the p-type conductivity in CuSc₁₋ₓMgₓO₂ sintered powders, producing a maximum conductivity of 0.015 S/cm at x≈0.06. A similar level of conductivity is observed in transparent polycrystalline CuSc₁₋ₓMgₓO₂ films at the same doping level. Mg doping causes no significant increase in optical absorption at this level. Intercalation of oxygen into the delafossite structure leads to a much larger increase in p-type conductivity. In powders, the maximum conductivity is 0.5 S/cm at y=0.23 and x=0.05. In oxygen-intercalated films, the maximum conductivity was 25 S/cm, with the transparent films gradually darkening as oxygen is incorporated. Oxygen intercalation increases the a-axis lattice parameter of the delafossite structure in both films and powders, with a much smaller effect on the c-axis parameter. Two distinct phases with y≈0 and y≈0.5 are observed in x-ray diffraction of powders. In films intermediate values of y are observed, often in combination with a distinct y=0 phase. The absorption properties of the powder samples indicate introduction of defects into the 2H polymorph of CuScO₂ and CuSc₁₋ₓMgₓO₂ compared to the 3R polymorph.
  • This is the publisher’s final pdf. The published article is copyrighted by the American Institute of Physics and can be found at: http://scitation.aip.org/content/aip/journal/jap. Article Copyright (2004) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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  • Kykyneshi, R., Nielsen, B. C., Tate, J., Li, J., & Sleight, A. W. (2004). Structural and transport properties of CuSc1-xMgxO2+y delafossites. Journal of Applied Physics, 96(11), 6188-6194. doi:10.1063/1.1806256
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  • 96
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  • 11
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  • This work was partially supported by the National Science Foundation Grant No. (DMR 0071727 and DMR 0245386), by the Army Research Office Grant No. (E-18-667-G3), and by the Research Corporation.
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