N-Type Mg 3 Sb  2- x  Bi  x  Alloys as Promising Thermoelectric Materials | Zendy

Hongjing Shang | Zendy; Zhongxin Liang | Zendy; Congcong Xu | Zendy; Jun Mao | Zendy; Hongwei Gu | Zendy; Fazhu Ding | Zendy; Zhifeng Ren | Zendy

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N-Type Mg ₃ Sb _{2- x} Bi _x Alloys as Promising Thermoelectric Materials

Author(s) -

Hongjing Shang,

Zhongxin Liang,

Congcong Xu,

Jun Mao,

Hongwei Gu,

Fazhu Ding,

Zhifeng Ren

Publication year - 2020

Publication title -

research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.8

H-Index - 16

ISSN - 2639-5274

DOI - 10.34133/2020/1219461

Subject(s) - thermoelectric effect , scattering , materials science , impurity , seebeck coefficient , carrier scattering , thermoelectric materials , figure of merit , electron mobility , grain boundary , charge carrier , analytical chemistry (journal) , condensed matter physics , thermodynamics , optoelectronics , metallurgy , physics , chemistry , optics , microstructure , chromatography , quantum mechanics

N-type Mg 3 Sb 2- x Bi x alloys have been extensively studied in recent years due to their significantly enhanced thermoelectric figure of merit ( zT ), thus promoting them as potential candidates for waste heat recovery and cooling applications. In this review, the effects resulting from alloying Mg 3 Bi 2 with Mg 3 Sb 2 , including narrowed bandgap, decreased effective mass, and increased carrier mobility, are summarized. Subsequently, defect-controlled electrical properties in n-type Mg 3 Sb 2- x Bi x are revealed. On one hand, manipulation of intrinsic and extrinsic defects can achieve optimal carrier concentration. On the other hand, Mg vacancies dominate carrier-scattering mechanisms (ionized impurity scattering and grain boundary scattering). Both aspects are discussed for Mg 3 Sb 2- x Bi x thermoelectric materials. Finally, we review the present status of, and future outlook for, these materials in power generation and cooling applications.

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