Scholarlink

<p>AgSbTe<sub>2</sub> is a typical thermoelectric material. Due to its low thermal conductivity, thermoelectric materials have been widely concerned by researchers. The preparation method of the material has a great influence on the thermoelectric properties of the material. This study investigates the effects of preparation methods (melting-quenching, MQ, ball milling, BM) and hot-pressing temperatures (350–450&#xa0;°C) on the thermoelectric properties of AgSbTe<sub>2</sub>. Powder materials synthesized via MQ and BM were consolidated into bulk samples using DC hot-pressing. Results revealed that MQ-derived samples exhibited fewer impurities (e.g. Ag₂Te) compared to BM-derived counterparts, attributed to insufficient energy during ball milling. Increasing hot-pressing temperature enhanced crystallinity and reduced impurity phases, with MQ-450 (450&#xa0;°C) achieving the highest phase purity. Thermoelectric performance analysis demonstrated that MQ-450 exhibited optimal electrical properties, with a Seebeck coefficient of 235&#xa0;μV·K⁻<sup>1</sup> at 300&#xa0;K and a power factor (<i>PF</i>) of 13.16&#xa0;μW·cm⁻<sup>1</sup>·K⁻<sup>2</sup> at 600&#xa0;K. Simultaneously, its total thermal conductivity decreased to 0.40 W·m⁻<sup>1</sup>·K⁻<sup>1</sup> at 500&#xa0;K due to suppressed lattice thermal conductivity (0.20–0.46 W·m⁻<sup>1</sup>·K⁻<sup>1</sup>). The synergistic optimization of electrical and thermal transport properties yielded a maximum dimensionless figure of merit (<i>ZT</i>) of 1.67 at 600&#xa0;K for MQ-450, outperforming existing AgSbTe<sub>2</sub>-based materials prepared via similar methods. This work highlights the critical role of preparation techniques and processing temperatures in tailoring thermoelectric performance, providing insights for designing high-efficiency thermoelectric materials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of preparation method on electric and thermal transport of AgSbTe2

  • 期刊论文

  • 发表日期：

    2025年6月26日

查看全文
  • Mingpeng Shi,
  • Fanggong Cai,
  • Yonglin Yuan,
  • Yuan Tang,
  • Pei Gao,
  • Xiaobo Lei,
  • Youpeng Sui,
  • Qinyong Zhang

摘要

AgSbTe2 is a typical thermoelectric material. Due to its low thermal conductivity, thermoelectric materials have been widely concerned by researchers. The preparation method of the material has a great influence on the thermoelectric properties of the material. This study investigates the effects of preparation methods (melting-quenching, MQ, ball milling, BM) and hot-pressing temperatures (350–450 °C) on the thermoelectric properties of AgSbTe2. Powder materials synthesized via MQ and BM were consolidated into bulk samples using DC hot-pressing. Results revealed that MQ-derived samples exhibited fewer impurities (e.g. Ag₂Te) compared to BM-derived counterparts, attributed to insufficient energy during ball milling. Increasing hot-pressing temperature enhanced crystallinity and reduced impurity phases, with MQ-450 (450 °C) achieving the highest phase purity. Thermoelectric performance analysis demonstrated that MQ-450 exhibited optimal electrical properties, with a Seebeck coefficient of 235 μV·K⁻1 at 300 K and a power factor (PF) of 13.16 μW·cm⁻1·K⁻2 at 600 K. Simultaneously, its total thermal conductivity decreased to 0.40 W·m⁻1·K⁻1 at 500 K due to suppressed lattice thermal conductivity (0.20–0.46 W·m⁻1·K⁻1). The synergistic optimization of electrical and thermal transport properties yielded a maximum dimensionless figure of merit (ZT) of 1.67 at 600 K for MQ-450, outperforming existing AgSbTe2-based materials prepared via similar methods. This work highlights the critical role of preparation techniques and processing temperatures in tailoring thermoelectric performance, providing insights for designing high-efficiency thermoelectric materials.