期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 819, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152999
关键词
Co-doped pyrrhotites; Sulfides; SPS; Thermoelectrics; Structural transition; Improved power factor
资金
- JSPS [P19720]
- KAKENHI [19F19720]
- JST CREST [JPMJCR15Q6, JPMJCR19Q]
- Grants-in-Aid for Scientific Research [19F19720] Funding Source: KAKEN
Sulfide-based materials are emerging as viable alternatives for the current state-of-the-art thermoelectric materials, which usually are composed of toxic, expensive and scarce elements. Here, a systematic study of one such inexpensive and environmentally friendly sulfide-based system, i.e. Fe7-xCoxS8 pyrrhotite-type compounds that were synthesized by solid-state reaction and densifled by Spark Plasma Sintering are investigated for their structural and thermoelectric properties. We report that substitution of Co for Fe in pyrrhotites: (i) induces structural transition from monoclinic 4C superstructure to trigonal 3C superstructure; (ii) modifies the magnetic behavior by decreasing the magnetic ordering temperature and magnetization; (iii) alters the type of dominant charge carriers (from p-to n-type) and enhances their electrical transport properties; (iv) mitigates the phonon contribution to the thermal conductivity; and (v) amplifies the thermoelectric figure of merit when compared with that of pristine pyrrhotites. (C) 2019 Elsevier B.V. All rights reserved.
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