Cost effective synthesis of p-type Zn-doped MgAgSb by planetary ball-milling with enhanced thermoelectric properties

Yanyan Zheng, Chengyan Liu, Lei Miao, Hong Lin, Jie Gao, Xiaoyang Wang, Junliang Chen, Shaohai Wu, Xin Li, Huanfu Cai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

As promising candidates for the progress of low-temperature thermoelectric devices, MgAgSb-based thermoelectric materials have drawn a great deal of attention. However, due to complicated phase changes, high content of impurities and high volatilization of Mg, it is difficult to synthesize pure phase MgAgSb-based thermoelectric materials via conventional methods. Here, MgAgSb alloy was successfully synthesized by a combination of common planetary ball milling and spark plasma sintering. Furthermore, the introduction of Zn improved the purity of alloys, leading to optimization of the electrical transport properties. As a result, the power factor was improved from 1087 μW m−1 K−2 for MgAg0.9Sb0.95 to 1394 μW m−1 K−2 for Mg0.97Zn0.03Ag0.9Sb0.95 at 473 K, and the ZT reached ∼0.7 at 473 K. These results suggest that MgAgSb-based thermoelectric materials have a good thermoelectric application potential and this study can be used as guidance for the synthesis and performance improvement of other thermoelectric materials. Our synthesis route sets forth a new avenue for accelerating commercial applications of MgAgSb-based thermoelectric power generation or refrigeration.

Original languageEnglish
Pages (from-to)35353-35359
Number of pages7
JournalRSC Advances
Volume8
Issue number62
DOIs
Publication statusPublished - 2018
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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  • Cite this

    Zheng, Y., Liu, C., Miao, L., Lin, H., Gao, J., Wang, X., Chen, J., Wu, S., Li, X., & Cai, H. (2018). Cost effective synthesis of p-type Zn-doped MgAgSb by planetary ball-milling with enhanced thermoelectric properties. RSC Advances, 8(62), 35353-35359. https://doi.org/10.1039/C8RA06765A