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Effect of nano‐SiC dispersion on thermoelectric properties of Bi 2 Te 3 polycrystals
Author(s) -
Li JingFeng,
Liu Jing
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622011
Subject(s) - spark plasma sintering , materials science , thermoelectric effect , dispersion (optics) , seebeck coefficient , thermal conductivity , figure of merit , electrical resistivity and conductivity , nano , thermoelectric materials , analytical chemistry (journal) , sintering , composite material , optoelectronics , thermodynamics , optics , chemistry , electrical engineering , physics , chromatography , engineering
Nano‐SiC dispersed Bi 2 Te 3 was synthesized by mechanical alloying (MA) followed by spark plasma sintering (SPS). The effects of SiC dispersion on the thermoelectric properties of the SPS‐sintered Bi 2 Te 3 alloys were investigated. The results revealed that SiC dispersion in the Bi 2 Te 3 matrix increased the absolute value of Seebeck coefficient. Although the electrical resistance was increased somewhat, Bi 2 Te 3 with 0.1 wt% SiC showed a higher power factor than Bi 2 Te 3 without SiC. Because the dispersion of SiC nano‐particles reduced the thermal conductivity at the same time, 0.1 wt% (∼0.24 vol% SiC) addition of SiC nano‐particles increased the figure of merit of Bi 2 Te 3 by 18%. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)