In:
Zeitschrift für anorganische und allgemeine Chemie, Wiley, Vol. 646, No. 14 ( 2020-07-31), p. 1116-1121
Abstract:
Cu‐Fe‐S‐based compounds gain the interest from thermoelectric community because all the consisting elements, Cu, Fe, and S, are non‐toxic and earth‐abundant. Comparing with CuFeS 2 and Cu 5 FeS 4 , the investigation on Cu 9 Fe 9 S 16 is very rare. In this work, a series of Cu 9– x Fe 9+ x S 16 samples were fabricated by means of melting‐annealing process. Their phase composition, microstructure, electrical and thermal transport properties were systematically investigated. X‐ray measurement confirms that all samples are phase pure. Transmission electron microscopy characterization indicates that the fabricated Cu 9 Fe 9 S 16 has a natural nanostructure. Cu 9 Fe 9 S 16 shows semiconducting‐like electrical transport behavior and intrinsically low lattice thermal conductivity. Beyond the numerous boundaries between nanosized grains, the existence of low‐frequency optical phonons is also responsible for the intrinsically low lattice thermal conductivity. Doping Fe at the Cu‐sites in Cu 9 Fe 9 S 16 significantly alters the electrical transport properties by introducing extra carriers. A peak dimensionless figure of merit zT value of 0.21 is obtained at 800 K for pure Cu 9 Fe 9 S 16 , which is comparable with that for CuFeS 2 .
Type of Medium:
Online Resource
ISSN:
0044-2313
,
1521-3749
DOI:
10.1002/zaac.v646.14
DOI:
10.1002/zaac.202000017
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
201094-X
detail.hit.zdb_id:
1481139-X
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