Issue 19, 2022

Insight into the preponderant role of the lattice size in Sn-based colusites for promoting a high power factor

Abstract

We investigated the feasibility of the co-doping effect of zinc and chromium for copper and vanadium substitution, respectively, and reported the first successful Cr incorporation within the bulk Sn-based colusite structure. We demonstrated that this could be achieved by combining process and lattice engineering to open a small solubility window within this sterically restricted V site. The thermoelectric properties of the colusite Cu25ZnV2−xCrxSn6S32 (x = 0–0.5) have been examined on sintered ingots over the temperature range of 300–700 K. As a result, we achieved the highest average power factor ever reported for Sn-based colusites. For the first time, our findings point out a striking insight related to the lattice size effect and its contribution to the Seebeck coefficient of Sn-based colusites. All the experimental results were rationalized by theoretical calculations. Using this unique finding, we finally optimized the compound by hot-pressing treatment and reported a competitive zT value of 0.8 at 700 K for the sample Cu25ZnV1.75Cr0.25Sn6S32.

Graphical abstract: Insight into the preponderant role of the lattice size in Sn-based colusites for promoting a high power factor

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
14 Feb 2022
Accepted
05 Apr 2022
First published
08 Apr 2022
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2022,10, 10701-10714

Insight into the preponderant role of the lattice size in Sn-based colusites for promoting a high power factor

P. Kamińska, C. Bourgès, R. Chetty, D. Gutiérrez-Del-Río, P. Śpiewak, W. Święszkowski, T. Nishimura and T. Mori, J. Mater. Chem. A, 2022, 10, 10701 DOI: 10.1039/D2TA01210C

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