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Enhancement of average thermoelectric figure of merit by increasing the grain-size of Mg_(3.2)Sb_(1.5)Bi_(0.49)Te_(0.01)

Kanno, Tsutomu and Tamaki, Hiromasa and Sato, Hiroki K. and Kang, Stephen Dongmin and Ohno, Saneyuki and Imasato, Kazuki and Kuo, Jimmy Jiahong and Snyder, G. Jeffrey and Miyazaki, Yuzuru (2018) Enhancement of average thermoelectric figure of merit by increasing the grain-size of Mg_(3.2)Sb_(1.5)Bi_(0.49)Te_(0.01). Applied Physics Letters, 112 (3). Art. No. 033903. ISSN 0003-6951. doi:10.1063/1.5016488.

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Zintl compound n-type Mg_3(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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kanno, Tsutomu0000-0001-5412-4410
Tamaki, Hiromasa0000-0002-4717-0272
Kang, Stephen Dongmin0000-0002-7491-7933
Ohno, Saneyuki0000-0001-8192-996X
Imasato, Kazuki0000-0001-7294-1780
Kuo, Jimmy Jiahong0000-0002-3434-1984
Snyder, G. Jeffrey0000-0003-1414-8682
Alternate Title:Enhancement of average thermoelectric figure of merit by increasing the grain-size of Mg3.2Sb1.5Bi0.49Te0.01
Additional Information:© 2017 AIP Publishing. Received 20 November 2017; accepted 27 December 2017; published online 17 January 2018. The NU group was supported by the NASA Science Mission Directorate's Radioisotope Power Systems Thermoelectric Technology Development program. The use of the Advanced Photon Source at Argonne National Laboratory was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-06CH11357
Issue or Number:3
Record Number:CaltechAUTHORS:20180118-123646486
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84383
Deposited By: Tony Diaz
Deposited On:18 Jan 2018 20:50
Last Modified:15 Nov 2021 20:19

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