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Enhancement of average thermoelectric figure of merit by increasing the grain-size of Mg3.2Sb1.5Bi0.49Te0.01

Kanno, Tsutomu ; Tamaki, Hiromasa ; Sato, Hiroki K. ; Kang, Stephen Dongmin ; Ohno, Saneyuki ; Imasato, Kazuki ; Kuo, Jimmy Jiahong ; Snyder, G. Jeffrey ; Miyazaki, Yuzuru

Applied physics letters, 2018-01, Vol.112 (3) [Periódico revisado por pares]

Melville: American Institute of Physics

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Título:
Enhancement of average thermoelectric figure of merit by increasing the grain-size of Mg3.2Sb1.5Bi0.49Te0.01
Autor: Kanno, Tsutomu ; Tamaki, Hiromasa ; Sato, Hiroki K. ; Kang, Stephen Dongmin ; Ohno, Saneyuki ; Imasato, Kazuki ; Kuo, Jimmy Jiahong ; Snyder, G. Jeffrey ; Miyazaki, Yuzuru
Assuntos: Antimony ; Applied physics ; Computing time ; Electron mobility ; Figure of merit ; Grain boundaries ; Grain size ; Hall effect ; Power efficiency ; Thermal conductivity ; Thermoelectric power generation ; Thermoelectricity
É parte de: Applied physics letters, 2018-01, Vol.112 (3)
Descrição: Zintl compound n-type Mg3(Sb,Bi)2 was recently found to exhibit excellent thermoelectric figure of merit zT (∼1.5 at around 700 K). To improve the thermoelectric performance in the whole temperature range of operation from room temperature to 720 K, we investigated how the grain size of sintered samples influences electronic and thermal transport. By increasing the average grain size from 1.0 μm to 7.8 μm, the Hall mobility below 500 K was significantly improved, possibly due to suppression of grain boundary scattering. We also confirmed that the thermal conductivity did not change by increasing the grain size. Consequently, the sample with larger grains exhibited enhanced average zT. The calculated efficiency of thermoelectric power generation reaches 14.5% (ΔT = 420 K), which is quite high for a polycrystalline pristine material.
Editor: Melville: American Institute of Physics
Idioma: Inglês

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Enhancement of average thermoelectric figure of merit by increasing the grain-size of Mg3.2Sb1.5Bi0.49Te0.01

Kanno, Tsutomu ; Tamaki, Hiromasa ; Sato, Hiroki K. ; Kang, Stephen Dongmin ; Ohno, Saneyuki ; Imasato, Kazuki ; Kuo, Jimmy Jiahong ; Snyder, G. Jeffrey ; Miyazaki, Yuzuru

Melville: American Institute of Physics

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