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<p>Thermoelectric properties can be effectively improved by elaborately designing and controlling the internal structure during the sintering process. Enlightened by liquid phase sintering, a relatively stable system of Cu<sub>2</sub>Se–<i>x</i> wt% Bi<sub>0.4</sub>Sb<sub>1.6</sub>Te<sub>3</sub> (BST) with embedded novel core–shell precipitates were designed. Under the combined action of alternating thermal cycle regulation and longitudinal pressure, a gradual dynamic evolution and repeated redistribution of BST liquid existed above the eutectic temperature. The liquid BST phase grew in situ along grain boundaries and connected to form a network, potentially providing a "fast lane" for carrier transport, suppress the thermal conductivity while holding high carrier mobility. This eventually led to an elevated figure-of-merit (<i>zT</i>) of 0.64 at 700&#xa0;K in Cu<sub>2</sub>Se–1 wt% BST, facilitated by presence of heterointerfaces and distorted lattice. The proposed cyclic hot-pressed liquid phase sintering process, which is aimed at precipitate stabilization, provides a new paradigm for design and is applicable to other thermoelectric materials.</p> Graphic abstract <p></p>

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Ostwald ripening behavior triggered by liquid Bi0.4Sb1.6Te3 for regulating thermoelectric transport in Cu2Se alloy

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Lin Bo,
  • Xing–Long Wang,
  • Wen–Ying Wang,
  • Wen–Ying Zhou,
  • Zheng Zhang,
  • Fu–Tian Liu,
  • Min Zuo,
  • De–Gang Zhao

摘要

Thermoelectric properties can be effectively improved by elaborately designing and controlling the internal structure during the sintering process. Enlightened by liquid phase sintering, a relatively stable system of Cu2Se–x wt% Bi0.4Sb1.6Te3 (BST) with embedded novel core–shell precipitates were designed. Under the combined action of alternating thermal cycle regulation and longitudinal pressure, a gradual dynamic evolution and repeated redistribution of BST liquid existed above the eutectic temperature. The liquid BST phase grew in situ along grain boundaries and connected to form a network, potentially providing a "fast lane" for carrier transport, suppress the thermal conductivity while holding high carrier mobility. This eventually led to an elevated figure-of-merit (zT) of 0.64 at 700 K in Cu2Se–1 wt% BST, facilitated by presence of heterointerfaces and distorted lattice. The proposed cyclic hot-pressed liquid phase sintering process, which is aimed at precipitate stabilization, provides a new paradigm for design and is applicable to other thermoelectric materials.

Graphic abstract