Enhanced thermoelectric properties of bismuth telluride bulk achieved by telluride-spilling during the spark plasma sintering process

YB22C2N is one of a series of rare earth borocarbonitrides and is potentially the long awaited n-type counterpart to boron carbide. We conducted studies on YB22C2N spark plasma sintered with additions of YB4 and YB25C, including the investigations of the densification process and the thermoelectric properties of the material. We discovered that a small amount of dopants can lower the starting temperature of densification during spark plasma sintering (SPS). Variations of pressure and temperature during the sintering process are also found to have an effect. Electrical conductivity of the dense samples has increased due to insertion of metal borides and also because of the improvement of the relative density. At the same time, only a slight reduction was observed for the Seebeck coefficient leading to an important improvement of power factor. The highest density of more than 95% was achieved with 5 wt% of YB25(C) dopant.

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Thermoelectric properties of a doped LaNiO3 perovskite system prepared using a spark-plasma sintering process

Electronic Materials Letters ◽

10.1007/s13391-013-0034-0 ◽

2013 ◽

Vol 9 (4) ◽

pp. 513-516 ◽

Cited By ~ 6

Author(s):

Jang-Yeul Tak ◽

Soon-Mok Choi ◽

Won-Seon Seo ◽

Hyung Koun Cho

Keyword(s):

Spark Plasma Sintering ◽

Thermoelectric Properties ◽

Sintering Process ◽

Plasma Sintering ◽

Spark Plasma

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Enhancing Thermoelectric Properties of Si80Ge20 Alloys Utilizing the Decomposition of NaBH4 in the Spark Plasma Sintering Process

Energies ◽

10.3390/en81010958 ◽

2015 ◽

Vol 8 (10) ◽

pp. 10958-10970 ◽

Cited By ~ 2

Author(s):

Ali Lahwal ◽

Xiaoyu Zeng ◽

Sriparna Bhattacharya ◽

Menghan Zhou ◽

Dale Hitchcock ◽

...

Keyword(s):

Spark Plasma Sintering ◽

Thermoelectric Properties ◽

Sintering Process ◽

Plasma Sintering ◽

Spark Plasma

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Spark Plasma Sintering Effect on Thermoelectric Properties of Nanostructured Bismuth Telluride Synthesized by High Energy Ball Milling

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17515 ◽

2020 ◽

Vol 20 (6) ◽

pp. 3902-3908

Author(s):

Sandeep K. Pundir ◽

Sukhvir Singh ◽

Parveen Jain

Keyword(s):

Thermal Conductivity ◽

Ball Milling ◽

Spark Plasma Sintering ◽

Thermoelectric Properties ◽

Bismuth Telluride ◽

Figure Of Merit ◽

High Energy ◽

Plasma Sintering ◽

Spark Plasma ◽

Energy Ball

Thermoelectric properties of high energy ball milled nano structured bismuth telluride (Bi2Te3) have been reported. By high energy ball milling, alloyed bulk crystalline ingots crush into nanopowder and followed by spark plasma sintering (SPS), we have demonstrate high figure of merit (ZT) in bismuth telluride pellet samples. In this work systematic study carried out on three pellet samples of Bi2Te3, synthesized by high ball milling for the time period of 4 hours, 8 hours and 12 hours and followed by SPS at the same processing parameters. A peak value of dimensionless figure of merit of about 1.22 at the temperature of 473 K has been achieved for 8 hours ball milled pellet sample. This enhancement in ZT value is mostly due to decrease in thermal conductivity. Results of this study demonstrate that ball milling and SPS has a major effect in controlling the density of grain boundaries of Bi2Te3 nano particles, while the pressure exerted on the powder samples during SPS introduce stress at the boundaries of the crystallites. These disordered crystallite boundary regions exert scattering of thermal energy carriers which reduced the thermal conductivity of the materials.

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