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<p>Cu<sub>2</sub>S suffers from poor thermal stability during repeated heating because Cu<sup>+</sup> migration, sulfur volatilization, and phase transformation readily occur at elevated temperatures. In this work, Nd<sub>2</sub>S<sub>3</sub>-modified Cu<sub>2</sub>S composites were prepared at 400-600&#xa0;°C to evaluate the effects of the additive concentration and sintering temperature on the phase evolution, microstructure, thermal response, and selected properties. x-ray diffraction revealed that Nd<sub>2</sub>S<sub>3</sub> broadens the Cu<sub>2</sub>S reflections, causes only minor lattice-parameter changes, and may be associated with temperature-dependent evolution involving monoclinic, hexagonal, and possibly Cu-deficient copper sulfide phases. Scanning electron microscopy and energy-dispersive x-ray spectroscopy (SEM/EDS) images indicate that moderate Nd<sub>2</sub>S<sub>3</sub> addition improves microstructural uniformity, especially near 500&#xa0;°C, whereas excessive addition and/or higher sintering temperatures promote precipitation and compositional heterogeneity. TG-DSC and thermal-cycling tests confirmed the delayed degradation and reduced mass loss after Nd<sub>2</sub>S<sub>3</sub> addition, with relatively favorable stabilization observed at intermediate compositions. The supporting UV–vis, magnetic, density/hardness, and representative electrical-transport properties further indicate that Nd<sub>2</sub>S<sub>3</sub> affects the local structural/electronic environment, improves densification and hardness at moderate addition levels, and is associated with a more stable high-temperature electrical response. Nd<sub>2</sub>S<sub>3</sub> is a feasible rare-earth sulfide modifier for improving the thermal and processing stability of Cu<sub>2</sub>S-based materials.</p>

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Effect of Nd2S3 Addition on the Phase Evolution and Thermal Stability of Cu2S

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Liang Li,
  • Zihan Li,
  • Zhanlong Liu,
  • Congbin Liu,
  • Junbao He,
  • Min Jin,
  • Aiguo Zhou,
  • Yuqi Chen

摘要

Cu2S suffers from poor thermal stability during repeated heating because Cu+ migration, sulfur volatilization, and phase transformation readily occur at elevated temperatures. In this work, Nd2S3-modified Cu2S composites were prepared at 400-600 °C to evaluate the effects of the additive concentration and sintering temperature on the phase evolution, microstructure, thermal response, and selected properties. x-ray diffraction revealed that Nd2S3 broadens the Cu2S reflections, causes only minor lattice-parameter changes, and may be associated with temperature-dependent evolution involving monoclinic, hexagonal, and possibly Cu-deficient copper sulfide phases. Scanning electron microscopy and energy-dispersive x-ray spectroscopy (SEM/EDS) images indicate that moderate Nd2S3 addition improves microstructural uniformity, especially near 500 °C, whereas excessive addition and/or higher sintering temperatures promote precipitation and compositional heterogeneity. TG-DSC and thermal-cycling tests confirmed the delayed degradation and reduced mass loss after Nd2S3 addition, with relatively favorable stabilization observed at intermediate compositions. The supporting UV–vis, magnetic, density/hardness, and representative electrical-transport properties further indicate that Nd2S3 affects the local structural/electronic environment, improves densification and hardness at moderate addition levels, and is associated with a more stable high-temperature electrical response. Nd2S3 is a feasible rare-earth sulfide modifier for improving the thermal and processing stability of Cu2S-based materials.