Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg

Imasato, Kazuki; Ohno, Saneyuki; Kang, Stephen Dongmin; Snyder, G. Jeffrey

doi:10.1063/1.5011379

Title: Improving the thermoelectric performance in Mg_3+xSb_1.5Bi_0.49Te_0.01 by reducing excess Mg

Abstract

Here, the thermoelectric performance of Mg_3+xSb_1.5Bi_0.49Te_0.01 was improved by reducing the amount of excess Mg (x = 0.01-0.2). A 20% reduction in effective lattice thermal conductivity at 600 K was observed by decreasing the nominal x from 0.2 to 0.01 in Mg_3+xSb_1.5Bi_0.49Te_0.01, leading to a 20% improvement in the figure-of-merit zT. Since materials with different amounts of Mg have similar electronic properties, the enhancement is attributed primarily to the reduction in thermal conductivity. Lastly, it is known that excess Mg is required to make n-type Mg_3+xSb_1.5Bi_0.49Te_0.01; however, too much excess Mg in the material increases the thermal conductivity and is therefore detrimental for the overall thermoelectric performance of the material.

Authors:

^[1];

^[2];

^[2]; Snyder, G. Jeffrey ^[1]

Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)

Publication Date:: Fri Jan 19 00:00:00 EST 2018

Research Org.:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1470445

Alternate Identifier(s):: OSTI ID: 1417526

Grant/Contract Number:: SC0001299; FG02-09ER46577

Resource Type:: Accepted Manuscript

Journal Name:: APL Materials

Additional Journal Information:: Journal Volume: 6; Journal Issue: 1; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; Journal ID: ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; solar (photovoltaic); solar (thermal); solid state lighting; phonons; thermal conductivity; thermoelectric; defects; mechanical behavior; charge transport; spin dynamics; materials and chemistry by design; optics; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)

Citation Formats


                    Imasato, Kazuki, Ohno, Saneyuki, Kang, Stephen Dongmin, and Snyder, G. Jeffrey. Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg.  United States: N. p., 2018. 
Web.  doi:10.1063/1.5011379.

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                    Imasato, Kazuki, Ohno, Saneyuki, Kang, Stephen Dongmin, & Snyder, G. Jeffrey. Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg.  United States.  https://doi.org/10.1063/1.5011379

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                    Imasato, Kazuki, Ohno, Saneyuki, Kang, Stephen Dongmin, and Snyder, G. Jeffrey. Fri .  
"Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg".  United States.  https://doi.org/10.1063/1.5011379.  https://www.osti.gov/servlets/purl/1470445.

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@article{osti_1470445,

  title        = {Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg},

  author       = {Imasato, Kazuki and Ohno, Saneyuki and Kang, Stephen Dongmin and Snyder, G. Jeffrey},

  abstractNote = {Here, the thermoelectric performance of Mg3+xSb1.5Bi0.49Te0.01 was improved by reducing the amount of excess Mg (x = 0.01-0.2). A 20% reduction in effective lattice thermal conductivity at 600 K was observed by decreasing the nominal x from 0.2 to 0.01 in Mg3+xSb1.5Bi0.49Te0.01, leading to a 20% improvement in the figure-of-merit zT. Since materials with different amounts of Mg have similar electronic properties, the enhancement is attributed primarily to the reduction in thermal conductivity. Lastly, it is known that excess Mg is required to make n-type Mg3+xSb1.5Bi0.49Te0.01; however, too much excess Mg in the material increases the thermal conductivity and is therefore detrimental for the overall thermoelectric performance of the material.},

  doi          = {10.1063/1.5011379},

  journal      = {APL Materials},

  number       = 1,

  volume       = 6,

  place        = {United States},

  year         = {Fri Jan 19 00:00:00 EST 2018},

  month        = {Fri Jan 19 00:00:00 EST 2018}

}

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Figures / Tables:

FIG. 1. : Transport properties of Mg_3+xSb_1.5Bi_0.49Te_0.01 (x = 0.01-0.2) as a function of temperature: (a) Seebeck coefficient; (b) total thermal conductivity; (c) electrical conductivity; (d) figure-of-merit. While the electronic properties remain similar, the total thermal conductivity becomes smaller as less Mg (nominal composition) is used which leads to amore »

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Works referencing / citing this record:

High‐Performance N‐type Mg ₃ Sb ₂ towards Thermoelectric Application near Room Temperature
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Figures / Tables found in this record:

FIG. 1. (p. 4)

FIG. 2. (p. 5)

TABLE I (p. 6)

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Title: Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg

Abstract

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Title: Improving the thermoelectric performance in Mg_3+xSb_1.5Bi_0.49Te_0.01 by reducing excess Mg

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