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Related Experiment Video

Updated: Sep 11, 2025

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

Published on: August 30, 2024

Microstructural transformation for robust and high-efficiency Zintl thermoelectrics.

Meng Jiang^1,2, Qinghua Zhang³, Siyuan Zhang⁴

¹State Key Laboratory of Advanced Fiber Materials, Institute of Functional Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China.

Nature Communications

|August 15, 2025

Summary

A new graded ball milling technique improves the mechanical strength and processability of thermoelectric materials like YbZn2Sb2. This breakthrough enables more durable and efficient thermoelectric devices for waste heat recovery.

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Area of Science:

Materials Science
Solid State Physics
Energy Conversion

Background:

Thermoelectric materials convert waste heat to electricity but suffer from brittleness and poor processability.
Widespread application of thermoelectric generators is limited by mechanical limitations.

Purpose of the Study:

To enhance the mechanical robustness and processability of YbZn2Sb2-based thermoelectrics.
To develop a scalable strategy for improving thermoelectric device reliability and industrial viability.

Main Methods:

A graded ball milling strategy was employed to refine grain microstructure and increase dislocation density.
The strategy was extended to various brittle Zintl compounds (AZn2Sb2, AMg2Sb2, ACd2Sb2).
Fabrication of crack-free, large-size thermoelectric components.

Main Results:

Achieved enhanced mechanical properties and processability in YbZn2Sb2 thermoelectrics.
Demonstrated a pre-formation cohesive energy of 9.1 eV atom−1 and low lattice thermal conductivity (0.5 W m−1 K−1) in Yb0.5Mg1.3Zn1.2Sb2.
Thermoelectric module achieved >10% conversion efficiency and stable operation for over 40 hours.

Conclusions:

The graded ball milling strategy successfully reconciles mechanical durability with high thermoelectric performance.
This approach offers a scalable and versatile solution for next-generation thermoelectric devices.
Paves the way for industrial applications of robust and efficient thermoelectric generators.