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The Effect of Porosity and Milling Induced Defects on the Thermoelectric Properties of p‐Type Bi 2 Te 3 ‐Based Bulks
Author(s) -
Zhang Cheng Cheng,
Fan Xi An,
Hu Jie,
Jiang Cheng Peng,
Feng Bo,
Xiang Qiu Sheng,
Li Guang Qiang,
Li Ya Wei
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201600295
Subject(s) - materials science , thermoelectric effect , ball mill , porosity , electrical resistivity and conductivity , sintering , thermal conductivity , grain boundary , composite material , grain size , thermoelectric materials , seebeck coefficient , metallurgy , microstructure , thermodynamics , physics , electrical engineering , engineering
The p‐type (Bi,Sb) 2 Te 3 bulks are prepared from ball‐milling powders by resistance pressure sintering method and their thermoelectric properties are investigated as a function of ball milling time. Prolonging milling time would introduce more anti‐site defects, interaction of vacancies and antisite defect, grain‐boundaries and interface defects, leading to lower carrier concentration and mobility. The peak value of ZT = 1.0 is achieved at 300 K for the 5 h sample. When the testing temperature is over 323 K, the ZT value of the 0 h sample is higher than that of the 5 h sample. The effect of porosity on the thermoelectric properties is also investigated by effective medium theory. As the porosity increased, the electrical resistivity increases and the thermal conductivity decrease.