Scholarlink

<p>Thermal stability under repeated temperature fluctuations is a key issue limiting the practical reliability of Cu<sub>2</sub>S-based materials. In this work, EuS-modified Cu<sub>2</sub>S bulks were prepared at different sintering temperatures to investigate the effects of EuS addition on phase evolution, thermal response, and structural stability. X-ray diffraction and microstructural analyses show that the interaction between Eu-containing species and the Cu<sub>2</sub>S matrix is strongly temperature dependent. At relatively low temperature, Eu-containing species show stronger interaction with the Cu<sub>2</sub>S matrix, whereas at higher temperature and/or higher EuS content, secondary-phase EuS becomes more evident. Thermal-cycling tests under nitrogen and vacuum demonstrate that the EuS modification improves the mass retention and microstructural integrity of Cu<sub>2</sub>S during repeated thermal cycling. Additional non-isothermal TG/DSC/DTG analyses further indicate that the thermal evolution of the EuS–Cu<sub>2</sub>S system proceeds through kinetically correlated multi-step processes rather than random fluctuations. Optical measurements and first-principles calculations further suggest that local Eu incorporation can perturb the electronic structure of Cu<sub>2</sub>S, while representative transport and magnetic results provide supplementary evidence for structure-dependent functional response. These results indicate that EuS modification is a feasible route for regulating phase evolution and enhancing the thermal robustness of Cu<sub>2</sub>S-based 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

Thermal stability and temperature-dependent phase evolution of EuS-modified Cu2S composites

  • 期刊论文

  • 发表日期：

    2026年4月12日

查看全文
  • Liang Li,
  • Boke Sun,
  • Zeji Xu,
  • Chunying Pu,
  • Yuling Song,
  • Min Jin,
  • Aiguo Zhou,
  • Yuqi Chen

摘要

Thermal stability under repeated temperature fluctuations is a key issue limiting the practical reliability of Cu2S-based materials. In this work, EuS-modified Cu2S bulks were prepared at different sintering temperatures to investigate the effects of EuS addition on phase evolution, thermal response, and structural stability. X-ray diffraction and microstructural analyses show that the interaction between Eu-containing species and the Cu2S matrix is strongly temperature dependent. At relatively low temperature, Eu-containing species show stronger interaction with the Cu2S matrix, whereas at higher temperature and/or higher EuS content, secondary-phase EuS becomes more evident. Thermal-cycling tests under nitrogen and vacuum demonstrate that the EuS modification improves the mass retention and microstructural integrity of Cu2S during repeated thermal cycling. Additional non-isothermal TG/DSC/DTG analyses further indicate that the thermal evolution of the EuS–Cu2S system proceeds through kinetically correlated multi-step processes rather than random fluctuations. Optical measurements and first-principles calculations further suggest that local Eu incorporation can perturb the electronic structure of Cu2S, while representative transport and magnetic results provide supplementary evidence for structure-dependent functional response. These results indicate that EuS modification is a feasible route for regulating phase evolution and enhancing the thermal robustness of Cu2S-based materials.