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<p>This study presents the development and characterization of novel high-entropy ceramics, (Mg<sub>0.25</sub>Ni<sub>0.25</sub>Co<sub>0.25</sub>Zn<sub>0.25</sub>)<sub>2</sub>SiO<sub>4</sub>, designed to achieve enhanced microwave dielectric performance. To address the limitations of traditional Mg<sub>2</sub>SiO<sub>4</sub> ceramics—such as high sintering temperatures and poor thermal stability—a high-entropy approach was employed, along with the incorporation of CuO as a sintering aid to promote densification and improve functional properties. The ceramics were synthesized using a carefully optimized solid-state reaction process, with detailed control of milling parameters and sintering conditions. Structural and dielectric characterizations, including X-ray diffraction with Rietveld refinement, SEM–EDS analysis, and microwave resonance testing, demonstrated that sintering at 1040&#xa0;°C induced the formation of a distinct Cu-rich core–shell microstructure. This structure significantly enhanced dielectric properties by facilitating interfacial polarization and limiting charge carrier mobility, resulting in a high relative permittivity (<i>ε</i><sub>r</sub> = 8.24), a high-quality factor × frequency (<i>Q</i> × <i>f</i> = 17,613.5&#xa0;GHz), and improved thermal stability (<i>τ</i><sub><i>f</i></sub> = −&#xa0;60.35&#xa0;ppm/°C). These findings provide valuable insights into the role of entropy-induced lattice distortion and microstructural design in tuning dielectric behavior, offering a practical strategy for advancing high-performance microwave dielectric materials.</p>

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Effect of sintering temperature on the structure and dielectric properties of (Mg0.25Ni0.25Co0.25Zn0.25)2SiO4 high-entropy ceramics

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Juan Wang,
  • Hong Pan,
  • Julong Song,
  • Xin Wang,
  • Beibei Wang,
  • Zhuo Xing

摘要

This study presents the development and characterization of novel high-entropy ceramics, (Mg0.25Ni0.25Co0.25Zn0.25)2SiO4, designed to achieve enhanced microwave dielectric performance. To address the limitations of traditional Mg2SiO4 ceramics—such as high sintering temperatures and poor thermal stability—a high-entropy approach was employed, along with the incorporation of CuO as a sintering aid to promote densification and improve functional properties. The ceramics were synthesized using a carefully optimized solid-state reaction process, with detailed control of milling parameters and sintering conditions. Structural and dielectric characterizations, including X-ray diffraction with Rietveld refinement, SEM–EDS analysis, and microwave resonance testing, demonstrated that sintering at 1040 °C induced the formation of a distinct Cu-rich core–shell microstructure. This structure significantly enhanced dielectric properties by facilitating interfacial polarization and limiting charge carrier mobility, resulting in a high relative permittivity (εr = 8.24), a high-quality factor × frequency (Q × f = 17,613.5 GHz), and improved thermal stability (τf = − 60.35 ppm/°C). These findings provide valuable insights into the role of entropy-induced lattice distortion and microstructural design in tuning dielectric behavior, offering a practical strategy for advancing high-performance microwave dielectric materials.