Ultra-low thermal conductivity and improved thermoelectric performance in disordered nanostructured copper tin sulphide (Cu2SnS3, CTS)
In: Journal of alloys and compounds 830 (2020): 154604-1–154604-8. doi:10.1016/j.jallcom.2020.154604 info:cnr-pdr/source/autori:K. Lohani; E. Isotta; N. Ataollahi; C. Fanciulli; A. Chiappini; P. Scardi/titolo:Ultra-low thermal conductivity and improved thermoelectric performance in disordered nanostructured copper tin sulphide (Cu2SnS3, CTS)/doi:10.1016%2Fj.jallcom.2020.154604/rivista:Journal of alloys and compounds/anno:2020/pagina_da:154604-1/pagina_a:154604-8/intervallo_pagine:154604-1–154604-8/volume:830; (2020)
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Zugriff:
Copper tin sulphide (Cu2SnS3, CTS) is a promising p-type thermoelectric material. In the present work, we have investigated the cation disorder in CTS disks made by sintering powders produced via high energy reactive ball-milling. The crystalline structures, electronic and thermal properties were systematically investigated. As-milled CTS shows a disordered cubic structure (c-CTS), preserved with thermal treatment up to 500 C. By increasing the thermal treatment temperature, CTS gradually evolves towards the ordered monoclinic structure (m-CTS), reaching complete order at 650 C. The disordered CTS has several times higher zT than the ordered CTS. In fact, ordered CTS has high thermopower, up to 700 mV/K, and high electrical resistivity leading to zT < 0.05 above 700K; whereas, disordered (c-CTS) has comparatively high zT~0.30 above 700K. This has been related to the lower electrical resistivity, and the ultra-low thermal conductivity (k~0.26 W/m-K), resulting from the disordered structure, promoting Phonon-Glass-Electron-Crystal (PGEC) characteristics. In our best knowledge, zT~0.30 above 700K is the highest in CTS samples without acting on the chemistry of the system.
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Ultra-low thermal conductivity and improved thermoelectric performance in disordered nanostructured copper tin sulphide (Cu2SnS3, CTS)
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Autor/in / Beteiligte Person: | Scardi, Paolo ; Isotta, Eleonora ; Ataollahi, Narges ; Lohani, Ketan ; Fanciulli, Carlo ; Chiappini, Andrea |
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Quelle: | Journal of alloys and compounds 830 (2020): 154604-1–154604-8. doi:10.1016/j.jallcom.2020.154604 info:cnr-pdr/source/autori:K. Lohani; E. Isotta; N. Ataollahi; C. Fanciulli; A. Chiappini; P. Scardi/titolo:Ultra-low thermal conductivity and improved thermoelectric performance in disordered nanostructured copper tin sulphide (Cu2SnS3, CTS)/doi:10.1016%2Fj.jallcom.2020.154604/rivista:Journal of alloys and compounds/anno:2020/pagina_da:154604-1/pagina_a:154604-8/intervallo_pagine:154604-1–154604-8/volume:830; (2020) |
Veröffentlichung: | Elsevier Sequoia, Lausanne , Svizzera, 2020 |
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