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High-Performance Mg₃Sb_2- Bi Thermoelectrics: Progress and Perspective.

Airan Li¹, Chenguang Fu², Xinbing Zhao¹

¹State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, 310027 Hangzhou, China.

Research (Washington, D.C.)

|February 24, 2021

Summary

Low-cost Mg3Sb2-xBix alloys show promise as thermoelectric materials, achieving a figure of merit (zT) above unity. This review explores their structure, optimization, and applications as alternatives to Bi2Te3-Sex alloys.

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Area of Science:

Materials Science
Solid State Physics
Nanotechnology

Background:

Mg3Sb2-based alloys are emerging as cost-effective thermoelectric materials.
They offer a promising alternative to commercial Bi2Te3-based alloys for near-room-temperature applications.

Purpose of the Study:

To review the structure-property-application relationship in Mg3Sb2-xBix alloys.
To discuss optimization strategies for enhancing thermoelectric performance.
To outline future directions and applications.

Main Methods:

Review of crystallographic, electronic, and phononic structure analysis.
Discussion of band engineering via Sb/Bi alloying.
Analysis of carrier scattering mechanisms and defect engineering.

Main Results:

Mg3Sb2-xBix alloys demonstrate a figure of merit (zT) exceeding unity between 300-700 K.
Optimization strategies focus on band structure, carrier scattering, and defect control.
These alloys show potential for refrigeration and low-grade heat power generation.

Conclusions:

Mg3Sb2-xBix alloys possess excellent thermoelectric properties, driven by their unique structural characteristics.
Further research into optimization and engineering aspects will accelerate their practical application.
These materials represent a significant advancement in low-cost thermoelectric technology.