Issue 85, 2015

Enhanced thermoelectric properties in Pb-doped BiCuSeO oxyselenides prepared by ultrafast synthesis

Abstract

BiCuSeO oxyselenides have been successfully fabricated by self-propagating high-temperature synthesis (SHS). Compared with the SHS process of binary or ternary alloys, thermal analysis indicates the ignition temperature of quaternary layered BiCuSeO oxyselenides approaches the second lower melting point of the compound. The ZT value of SHS-synthesized BiCuSeO is almost 1.5 times larger than that of the solid state reaction (SSR) product at 873 K. This is attributed to the existing amorphous region, nano-pores, and optimized grain size. Furthermore, with the partial substitution of Pb2+ for Bi3+, ZT was enhanced through the optimization of charge carrier concentration and band gap narrowing. This achieved a ZT of 0.91 at 873 K for Bi1−xPbxCuSeO (x = 0.04). Combining with the Debye–Callaway model analysis, the ultralow lattice thermal conductivity of BiCuSeO can potentially be derived from the synergistic effect of intrinsic point defects, efficient grain boundaries and some other mechanisms.

Graphical abstract: Enhanced thermoelectric properties in Pb-doped BiCuSeO oxyselenides prepared by ultrafast synthesis

Supplementary files

Article information

Article type
Paper
Submitted
06 Jul 2015
Accepted
06 Aug 2015
First published
06 Aug 2015

RSC Adv., 2015,5, 69878-69885

Author version available

Enhanced thermoelectric properties in Pb-doped BiCuSeO oxyselenides prepared by ultrafast synthesis

G. Ren, J. Lan, S. Butt, K. J. Ventura, Y. Lin and C. Nan, RSC Adv., 2015, 5, 69878 DOI: 10.1039/C5RA13191J

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