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Thermoelectric properties of Ce‐doped n‐type Ce x Bi 2 − x Te 2.7 Se 0.3 nanocomposites
Author(s) -
Wu Fang,
Song Hongzhang,
Jia Jianfeng,
Gao Feng,
Zhang Yingjiu,
Hu Xing
Publication year - 2013
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.201228589
Subject(s) - materials science , thermoelectric effect , doping , seebeck coefficient , analytical chemistry (journal) , nanorod , electrical resistivity and conductivity , thermal conductivity , thermoelectric materials , figure of merit , nanocomposite , nanotechnology , composite material , optoelectronics , chemistry , thermodynamics , physics , chromatography , engineering , electrical engineering
Ce‐doped Ce x Bi 2 − x Te 2.7 Se 0.3 ( x = 0–0.3) nanopowders were synthesized by the hydrothermal method and the obtained nanopowders were hot‐pressed into bulk at 673 K under a pressure of 60 MPa in vacuum. The results show that Ce doping has significant effects on the morphologies of the nanopowders. With increasing Ce doping amount the morphology of the nanopowder changes from nanosheets to nanorods. The thermoelectric (TE) properties measurements show that Ce doping can increase the electrical conductivity greatly, but has little effect on improving Seebeck coefficient and thermal conductivity. There is an optimum value of Ce doping amount. The Ce 0.2 Bi 1.8 Se 0.3 Te 2.7 sample shows a highest figure of merit of 0.85 at 413 K as compared to other samples prepared in same conditions.