Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 39, Pages 15207-15214Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta05945g
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Funding
- International Joint Research Program for Innovative Energy Technology - Ministry of Economy, Trade and Industry, Japan
- JSPS KAKENHI [25420699]
- Grants-in-Aid for Scientific Research [25420699] Funding Source: KAKEN
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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 Cu2S-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.
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