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Role of excess tellurium on the electrical and thermal properties in Te-doped paracostibite

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Abstract

The effect of excess Te in the preparation of synthetic mineral paracostibite, CoSbS, was investigated in an attempt to produce a nano–micro-porous architecture. While the latter was found to have no significant impact, we demonstrate that such strategy is a successful approach to enhance both electrical and thermal property via the formation of a more Te-rich paracostibite phase compared with conventional substitution. Tuning of the electrical properties led to a large power factor of 2150 μW m−1 K−2 at 765 K while the lattice thermal conductivity was reduced by ca. 45%, mainly due to an increased electron–phonon scattering. Ultimately, a maximum ZT of 0.45 was achieved, representing a 100% improvement over conventional Te-doped paracostibite.

Graphical abstract: Role of excess tellurium on the electrical and thermal properties in Te-doped paracostibite

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Article information


Submitted
02 Sep 2019
Accepted
18 Dec 2019
First published
19 Dec 2019

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Role of excess tellurium on the electrical and thermal properties in Te-doped paracostibite

G. Guélou, F. Failamani, P. Sauerschnig, J. Waybright, K. Suzuta and T. Mori, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC04840E

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