Journal of Powder Materials

Article

[Korean]
Thermoelectric Properties in the Cu Doping Effects of the n-type Bi-Te Powders: Min Soo Park, Hye Young Koo, Gook Hyun Ha, Yong Ho Park; J Korean Powder Metall Inst. 2015;22(4):254-259. Published online August 1, 2015; DOI: https://doi.org/10.4150/KPMI.2015.22.4.254

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Abstract PDF: Bi2Te3 related compounds show the best thermoelectric properties at room temperature. However, n-type Bi2Te2.7Se0.3 showed no improvement on ZT values. To improve the thermolectric propterties of n-type Bi2Te2.7Se0.3, this research has Cu-doped n-type powder. This study focused on effects of Cu-doping method on the thermoelectric properties of n-type materials, and evaluated the comparison between the Cu chemical and mechanical doping. The synthesized powder was manufactured by the spark plasma sintering(SPS). The thermoelectric properties of the sintered body were evaluated by measuring their Seebeck coefficient, electrical resistivity, thermal conductivity, and hall coefficient. An introduction of a small amount of Cu reduced the thermal conductivity and improved the electrical properties with Seebeck coefficient. The authors provided the optimal concentration of Cu_0.1Bi_1.99Se_0.3Te_2.7. A figure of merit (ZT) value of 1.22 was obtained for Cu_0.1Bi_1.9Se_0.3Te_2.7 at 373K by Cu chemical doping, which was obviously higher than those of Cu_0.1Bi_1.9Se_0.3Te_2.7 at 373K by Cu mechanical doping (ZT=0.56) and Cu-free Bi₂Se_0.3Te_2.7 (ZT=0.51).

[English]
Synthesis and Thermoelectric Properties of Carbon Nanotube-Dispersed Bi₂Te₃ Matrix Composite Powders by Chemical Routes: Kyung Tae Kim, Injoon Son, Gook Hyun Ha; J Korean Powder Metall Inst. 2013;20(5):345-349.; DOI: https://doi.org/10.4150/KPMI.2013.20.5.345

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Carbon nanotube-dispersed bismuth telluride matrix (CNT/Bi_2Te_3) nanopowders were synthesized by chemical routes followed by a ball-milling process. The microstructures of the synthesized CNT/Bi_2Te_3 nanopowders showed the characteristic microstructure of CNTs dispersed among disc-shaped Bi_2Te_3 nanopowders with as an average size of 500 nm in-plane and a few tens of nm in thickness. The prepared nanopowders were sintered into composites with a homogeneous dispersion of CNTs in a Bi_2Te_3 matrix. The dimensionless figure-of-merit of the composite showed an enhanced value compared to that of pure Bi_2Te_3 at the room temperature due to the reduced thermal conductivity and increased electrical conductivity with the addition of CNTs.

Citations

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Effect of Surface Roughness and Electroless Ni–P Plating on the Bonding Strength of Bi–Te-based Thermoelectric Modules
Sung Hwa Bae, Sungsoon Kim, Seong Hoon Yi, Injoon Son, Kyung Tae Kim, Hoyong Chung
Coatings.2019; 9(3): 213. CrossRef
Simple approach to synthesize CNTs uniformly coated Bi2Te3 nanocomposites by mechanical alloying
Balaji Ketharachapalli, Raj Kishora Dash
Applied Nanoscience.2018; 8(8): 1887. CrossRef
Fabrication of flexible SWCNTs-Te composite films for improving thermoelectric properties
Changcun Li, Pengliang Sun, Congcong Liu, Jingkun Xu, Tongzhou Wang, Wenfang Wang, Jian Hou, Fengxing Jiang
Journal of Alloys and Compounds.2017; 723: 642. CrossRef
Effects of Hydrogen Reduction in Microstructure, Mechanical and Thermoelectric Properties of Gas Atomized <italic>n</italic>-type Bi2Te2.7 Se0.3 Material
Pradip Rimal, Sang-Min Yoon, Eun-Bin Kim, Chul-Hee Lee, Soon-Jik Hong
journal of Korean Powder Metallurgy Institute.2016; 23(2): 126. CrossRef
High thermoelectric performance of Bi-Te alloy: Defect engineering strategy
Jong Gil Park, Young Hee Lee
Current Applied Physics.2016; 16(9): 1202. CrossRef
Investigation on the Thermoelectric Properties of Bismuth Telluride Matrix Composites by Addition of Graphene Oxide Powders
Kyung Tae Kim, Taesik Min, Dong Won Kim
Journal of Korean Powder Metallurgy Institute.2016; 23(4): 263. CrossRef

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