Vanadium-free colusites Cu 26 A 2 Sn 6 S 32 (A = Nb, Ta) for environmentally friendly thermoelectrics

Yuta Kikuchi, Yohan Bouyrie, Michihiro Ohta, Koichiro Suekuni, Makoto Aihara, Toshiro Takabatake

Research output: Contribution to journalArticle

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Abstract

The thermoelectric properties of colusites Cu 26 A 2 Sn 6 S 32 with A = V, Nb, and Ta have been investigated on high-density sintered compacts over the temperature range of 300-670 K. The ingots melted in evacuated and sealed quartz tubes were found to be composed of two colusite phases with slightly different lattice parameters. The successive hot-pressing converted the two-phase samples to single-phase ones of high density. Scanning electron microscopic analysis revealed the presence of CuS- and Cu 2 S-based secondary phases in only the sintered compact with A = Ta. For A = V, Nb, and Ta samples, the heavy hole effective mass of 3m 0 -4m 0 (m 0 : free electron mass) caused a high Seebeck coefficient, leading to a high thermoelectric power factor of 0.6-0.7 mW K -2 m -1 at 660 K. The electrical resistivity and lattice thermal conductivity for the A = Ta sample are lower than those for A = V and A = Nb samples, because the secondary phases in the A = Ta sample provide charge carriers and scatter effectively the phonons. As a result, a ZT of 0.8 at 670 K is achieved for the A = Ta system.

Original languageEnglish
Pages (from-to)15207-15214
Number of pages8
JournalJournal of Materials Chemistry A
Volume4
Issue number39
DOIs
Publication statusPublished - Jan 1 2016

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Vanadium
Quartz
Seebeck coefficient
Electrons
Thermoelectric power
Hot pressing
Phonons
Ingots
Charge carriers
Lattice constants
Thermal conductivity
Scanning
Temperature
cupric sulfide

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Vanadium-free colusites Cu 26 A 2 Sn 6 S 32 (A = Nb, Ta) for environmentally friendly thermoelectrics . / Kikuchi, Yuta; Bouyrie, Yohan; Ohta, Michihiro; Suekuni, Koichiro; Aihara, Makoto; Takabatake, Toshiro.

In: Journal of Materials Chemistry A, Vol. 4, No. 39, 01.01.2016, p. 15207-15214.

Research output: Contribution to journalArticle

Kikuchi, Yuta ; Bouyrie, Yohan ; Ohta, Michihiro ; Suekuni, Koichiro ; Aihara, Makoto ; Takabatake, Toshiro. / Vanadium-free colusites Cu 26 A 2 Sn 6 S 32 (A = Nb, Ta) for environmentally friendly thermoelectrics In: Journal of Materials Chemistry A. 2016 ; Vol. 4, No. 39. pp. 15207-15214.
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