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Transport phenomena in superionic Na х Cu2 − х S (х = 0.05; 0.1; 0.15; 0.2) compounds

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Abstract

The electronic and ionic conductivity, the electronic and ionic Seebeck coefficients, and the thermal conductivity of Na x Cu2 − x S (x = 0.05, 0.1, 0.15, 0.2) compounds were measured in the temperature range of 20–450 °С. The total cationic conductivity of Na0.2Cu1.8S is about 2 S/cm at 400 °С (the activation energy ≈ 0.21 eV). Over the studied compounds, the composition Na0.2Cu1.8S has the highest electronic conductivity (500–800 S/cm) in the temperature range from 20 to 300 °С, and the highest electronic Seebeck coefficient (about 0.2 mV/K) in the same temperature range is observed for Na0.15Cu1.85S composition; the electronic Seebeck coefficient increases abruptly above 300 °С for all compounds. The thermal conductivity of superionic Na0.2Cu1.8S is low, which causes high values of the dimensionless thermoelectric figure of merit ZT from 0.4 to 1 at temperatures from 150 to 340 °С.

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Authors and Affiliations

  1. Bashkir State University, Ufa, Russia

    M. Kh. Balapanov, R. Kh. Ishembetov, R. F. Almukhametov & R. A. Yakshibaev

  2. L.N. Gumilyov Eurasian National University, Astana, Kazakhstan

    K. A. Kuterbekov & M. M. Kubenova

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  1. M. Kh. Balapanov
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  2. R. Kh. Ishembetov
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  3. K. A. Kuterbekov
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Correspondence to M. Kh. Balapanov.

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Balapanov, M.K., Ishembetov, R.K., Kuterbekov, K.A. et al. Transport phenomena in superionic Na х Cu2 − х S (х = 0.05; 0.1; 0.15; 0.2) compounds. Ionics 24, 1349–1356 (2018). https://doi.org/10.1007/s11581-017-2299-z

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