Substantial role of doping in the thermoelectric and hardness properties of nanostructured BORNITE (cas 1308-82-3), Cu5FeS4

Add time:08/18/2019    Source:sciencedirect.com

To improve current solid state thermoelectric devices, high performance materials based on safe and abundant elements is required. Here, Cu5-xZnxFeS4 (0 ≤ x ≤ 0.1) and Cu4.96Co0.04Fe1-xZnxS4 (0 ≤ x ≤ 0.06) nanostructured solid solutions, based on very abundant elements, were synthesized by high energy ball milling and hot pressing. X-ray diffraction (XRD) data showed the crystal structure of the materials to be consistent with a pure bornite phase in the entire substitution level for Cu5-xZnxFeS4 and Cu4.96Co0.04Fe1-xZnxS4 solid solutions. A Vickers microhardness of 167 Hv was obtained for pristine bornite which increased to around 250 Hv upon doping. Zn-substitution led to a slight increase in the power factor form 0.25 mWm−1K−2 for pristine bornite to 0.27 mWm−1K−2 for Cu4.9Zn0.1FeS4 at 590 K. Substituting Co for Cu and Zn for Fe, on the other hand, led to a significantly high power factor of 0.37 mWm−1K−2 for Cu4.96Co0.04Fe0.96Zn0.04S4 at 590 K. Extremely low thermal conductivities of k < 0.75 Wm−1K−1 were obtained for all samples. A high ZT of 0.6 at 590 K was attained for Cu4.96Co0.04Fe0.96Zn0.04S4 solid solution which is among the highest reported values for bornite at 590 K.

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