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Thermoelectric Performance Enhancement in BiSbTe Alloy by Microstructure Modulation via Cyclic Spark Plasma Sintering with Liquid Phase
Author(s) -
Zhuang HuaLu,
Pei Jun,
Cai Bowen,
Dong Jinfeng,
Hu Haihua,
Sun FuHua,
Pan Yu,
Snyder Gerald Jeffrey,
Li JingFeng
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202009681
Subject(s) - spark plasma sintering , materials science , thermoelectric effect , microstructure , eutectic system , thermoelectric materials , alloy , sintering , thermal conductivity , metallurgy , optoelectronics , composite material , thermodynamics , physics
The widespread application of thermoelectric (TE) technology demands high‐performance materials, which has stimulated unceasing efforts devoted to the performance enhancement of Bi 2 Te 3 ‐based commercialized thermoelectric materials. This study highlights the importance of the synthesis process for high‐performance achievement and demonstrates that the enhancement of the thermoelectric performance of (Bi,Sb) 2 Te 3 can be achieved by applying cyclic spark plasma sintering to Bi x Sb 2– x Te 3 ‐Te above its eutectic temperature. This facile process results in a unique microstructure characterized by the growth of grains and plentiful nanostructures. The enlarged grains lead to high charge carrier mobility that boosts the power factor. The abundant dislocations originating from the plastic deformation during cyclic liquid phase sintering and the pinning effect by the Sb‐rich nano‐precipitates result in low lattice thermal conductivity. Therefore, a high ZT value of over 1.46 is achieved, which is 50% higher than conventionally spark‐plasma‐sintered (Bi,Sb) 2 Te 3 . The proposed cyclic spark plasma liquid phase sintering process for TE performance enhancement is validated by the representative (Bi,Sb) 2 Te 3 thermoelectric alloy and is applicable for other telluride‐based materials.