Enhanced Thermoelectric Properties of BiCuSeO Ceramics by Bi Vacancies

Abstract:

Polycrystalline Bi_1-xCuSeO (0 ≤ x ≤ 0.05) ceramics were prepared by self-propagating high-temperature synthesis followed by spark plasma sintering method. All the samples correspond with single BiCuSeO phase and high vacancies sample had higher density. The highest power factor of 4.71×10^-4 W.m^-1.K^-2 was obtained by 5% Bi vacancies at 873K, which is about 32% higher than that of the pristine sample. Along with slight reduction of thermal conductivity, the maximum ZT reached 0.68. The results show that vacancy engineering is a promising method for thermoelectric applications of BiCuSeO and related ceramics.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 803-810
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.803
• Online since: February 2018
• Authors: Wen Qiang Ma, Cheng Jie Deng, Jin Le Lan*, Xiao Ping Yang, Yuan Hua Lin
• Keywords: BiCuSeO, Electrical Transport Properties, High-Temperature Synthesis, Self-Propagating, Thermoelectric, Vacancies

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