Polycrystalline BiCuSeO oxide as a potential thermoelectric material
- 20 March 2012
- journal article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 5 (5), 7188-7195
- https://doi.org/10.1039/c2ee21274a
Abstract
This work revealed that BiCuSeO oxyselenide is a potential oxide-based thermoelectric material, whose dimensionless figure of merit (ZT) reaches ∼0.70 at 773 K. High phase-purity BiCuSeO polycrystalline materials with fine grains were synthesized by a facile method combining a solid-state reaction and spark plasma sintering. Purifying the constitutive phase and reducing the grain sizes by introducing a high-energy ball milling process before spark plasma sintering were found to be effective in property enhancement. The resultant single-phased BiCuSeO sample derived from ball-milled powders shows good electrical conductivity above 4.0 × 103 S m−1 and a large Seebeck coefficient above 200 μV K−1. This compound has a low thermal conductivity (∼0.5 W m−1 K−1), which is associated with its low phonon transport speed and Young's modulus. Results indicated that BiCuSeO-based materials are promising for energy conversion applications in the moderate temperature range.Keywords
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