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The influence of mobile copper ions on the glass-like thermal conductivity of copper-rich tetrahedrites

Vaqueiro, P., Guelou, G., Kaltzoglou, A., Smith, R. I., Barbier, T., Guilmeau, E. and Powell, A. V. (2017) The influence of mobile copper ions on the glass-like thermal conductivity of copper-rich tetrahedrites. Chemistry of Materials, 29 (9). pp. 4080-4090. ISSN 1520-5002

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To link to this item DOI: 10.1021/acs.chemmater.7b00891

Abstract/Summary

Tetrahedrites are promising p-type thermoelectric materials for energy recovery. We present here the first investigation of the structure and thermoelectric properties of copper-rich tetrahedrites, Cu12+xSb4S13 (0 < x ≤ 2.0). At room temperature, all samples with x > 0 consist of two tetrahedrite phases. In-situ neutron diffraction data demonstrate that on heating, the two tetrahedrite phases coalesce into a single tetrahedrite phase at temperatures between 493 and 553 K, and that this transition shows marked hysteresis on cooling. Our structural data indicate that copper ions become mobile above 393 K. Marked changes in the temperature dependence of the electrical and thermal transport properties of the copper-rich phases occur at the onset of copper mobility. Excess copper leads to a significant reduction in the total thermal conductivity, which for the nominal composition Cu14Sb4S13 reaches a value as low as 0.44 W m-1K-1 at room temperature, and to thermoelectric properties consistent with phonon liquid electron crystal (PLEC) behaviour.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Interdisciplinary centres and themes > Energy Research
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Thermal (CAF)
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Xray (CAF)
ID Code:70034
Additional Information:Author rewards used to purchase open access 12 months after publication
Publisher:American Chemical Society

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