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

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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.
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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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