Work

Comprehensive study of α-MgAgSb: Microstructure, carrier transport properties, and thermoelectric performance under ball milling techniques

Year: 2025

Type: article

Abstract: This study investigates the crystal structure, microstructure, electronic, thermal transport properties, and thermoelectric performance of α-MgAgSb synthesized through various ball milling techniques. Variations in synthesis methods can significantly impact thermoelectric performance. Our findings indicate that impurity phases, particularly the secondary phase Ag₃Sb, hinder grain growth and decrease carrier mobility . By systematically adjusting milling conditions, the increased grain size resulting from the suppression of impurity formation improves charge carrier mobility and enhances the power factor. Low-temperature resistivity analysis reveals distinct scattering mechanisms influenced by impurity levels. α-MgAgSb with a tiny content of Sb primarily exhibits electron-electron scattering, whereas higher impurity levels introduce both electron-electron and electron-phonon scattering. Additionally, thermal conductivity analysis using three Effective Medium Theory (EMT) methods shows that the distribution of Ag 3 Sb increases interfacial resistance. The maximum zT value of 1.36 was achieved in a compound with an α-MgAgSb to Sb ratio of 99 %:1 %.

Source: Journal of Material Science and Technology

DOI: 10.1016/j.jmst.2024.11.061

Authors: Song Yi Back, Steph Meikle, Takao Mori

Institutions: National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, University of Florida, University of Tsukuba

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,000

Funders: Japan Science and Technology Agency, JST-Mirai Program