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<p>Different from full-Heusler compounds, four vacancies in the face-centered cubic crystal structure provide extra sites for enhancing the thermoelectric properties of half-Heusler compounds (HHs). Herein, excess Ag is introduced to the Ni-site vacancies of ZrNiSn to optimize thermoelectric properties. The ZrNiAg<sub><i>x</i></sub>Sn (<i>x</i> = 0, 0.01, 0.02, and 0.03) samples were synthesized by levitation melting and spark plasma sintering. Remarkably, the introduction of excess Ag significantly improves the Seebeck coefficient of ZrNiAg<sub>0.01</sub>Sn, and a peak power factor of ~ 4.52 mW/(m K<sup>2</sup>) is achieved in ZrNiAg<sub>0.01</sub>Sn at 923 K, which is enhanced by 22.8% than that of pristine ZrNiSn. As a result, the figure of merit <i>zT</i> of pristine ZrNiSn is enhanced from ~ 0.60 to ~ 0.72 of ZrNiAg<sub>0.01</sub>Sn at 923 K. Additionally, grain refinement effectively increases the Vickers hardness of ZrNiAg<sub>0.01</sub>Sn, which is enhanced by 32.8% than that of pristine ZrNiSn. These results demonstrate a viable doping strategy for designing ZrNiSn-based HHs with excellent thermoelectric and mechanical properties.</p>

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Enhanced Thermoelectric and Mechanical Properties of ZrNiSn Half-Heusler Compounds by Excess Ag Doping at Ni Sites

  • 期刊论文

  • 发表日期：

    2025年4月19日

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  • Xinghui Wang,
  • Yu Yan,
  • Wen Zhang,
  • Huijun Kang,
  • Enyu Guo,
  • Zongning Chen,
  • Rongchun Chen,
  • Tongmin Wang

摘要

Different from full-Heusler compounds, four vacancies in the face-centered cubic crystal structure provide extra sites for enhancing the thermoelectric properties of half-Heusler compounds (HHs). Herein, excess Ag is introduced to the Ni-site vacancies of ZrNiSn to optimize thermoelectric properties. The ZrNiAgxSn (x = 0, 0.01, 0.02, and 0.03) samples were synthesized by levitation melting and spark plasma sintering. Remarkably, the introduction of excess Ag significantly improves the Seebeck coefficient of ZrNiAg0.01Sn, and a peak power factor of ~ 4.52 mW/(m K2) is achieved in ZrNiAg0.01Sn at 923 K, which is enhanced by 22.8% than that of pristine ZrNiSn. As a result, the figure of merit zT of pristine ZrNiSn is enhanced from ~ 0.60 to ~ 0.72 of ZrNiAg0.01Sn at 923 K. Additionally, grain refinement effectively increases the Vickers hardness of ZrNiAg0.01Sn, which is enhanced by 32.8% than that of pristine ZrNiSn. These results demonstrate a viable doping strategy for designing ZrNiSn-based HHs with excellent thermoelectric and mechanical properties.