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

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

Journal Article · Thu Jan 18 23:00:00 EST 2018 · APL Materials

DOI:https://doi.org/10.1063/1.5011379· OSTI ID:1470445

^[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)

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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

Grant/Contract Number:: SC0001299; SC0001299

OSTI ID:: 1470445

Alternate ID(s):: OSTI ID: 1417526

Journal Information:: APL Materials, Journal Name: APL Materials Journal Issue: 1 Vol. 6; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Designing high-performance n-type Mg ₃ Sb ₂ -based thermoelectric materials through forming solid solutions and biaxial strain Li, Juan; Zhang, Shuai; Wang, Boyi Journal of Materials Chemistry A, Vol. 6, Issue 41 https://doi.org/10.1039/c8ta07285j	journal	January 2018
Improved stability and high thermoelectric performance through cation site doping in n-type La-doped Mg ₃ Sb _1.5 Bi _0.5 Imasato, Kazuki; Wood, Max; Kuo, Jimmy Jiahong Journal of Materials Chemistry A, Vol. 6, Issue 41 https://doi.org/10.1039/c8ta08975b	journal	January 2018
Thermoelectric properties improvement in quasi-one-dimensional organic crystals Sanduleac, Ionel; Pflaum, Jens; Casian, Anatolie Journal of Applied Physics, Vol. 126, Issue 17 https://doi.org/10.1063/1.5120461	journal	November 2019

Figures / Tables (3)

FIG. 1.(p. 4)

FIG. 2.(p. 5)

TABLE I(p. 6)

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