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<p>Spinel ferrite samples with the composition Mg<sub>0.5</sub>Mn<sub>0.5−x</sub>Cu<sub>x</sub>Fe<sub>1.98</sub>Er<sub>0.02</sub>O<sub>4</sub> (x = 0, 0.02, 0.04, 0.06, and 0.1) were synthesized via the solid-state route and probed for microwave absorption applications. The compositional selection has been made with reference to our previous work given in the introduction section. X-ray diffraction combined with Rietveld refinement revealed a multiphase nature. The material is characterized by the coexistence of a cubic spinel phase and a secondary orthorhombic phase. SEM analysis showed that Cu doping significantly influence the grains with more uniform, faceted, and closely packed, reflecting enhanced diffusion and crystallization. AFM measurements indicated high surface roughness. The Cu doped material strongly affects the dielectric and magnetic properties. Favourable dielectric constant and loss factor values over a wide frequency range demonstrate the suitability of these materials for high-frequency applications. The Cu doped ferrites exhibit a broad distribution of relaxation times, enabling effective interaction with and absorption of an extended microwave frequency spectrum. UV-Vis spectroscopy revealed a decrease in the optical band gap from 2.32&#xa0;eV to 2.26&#xa0;eV upon Cu doping. The combined improvements in optical, dielectric, and thermal properties confirm that Er-substituted Cu-doped ferrites are promising candidates for high-frequency and high-temperature microwave-absorbing applications.</p>

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Compositional Engineering of Mg–Mn–Cu–Er Ferrite Ceramics: Functional Behaviour Toward High-Performance Microwave Absorbers

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Gorachand Biswal,
  • Babita Ojha,
  • Varsa Purohit,
  • Rakesh Ranjan Sahoo,
  • Dhrubananda Behera,
  • Subhashree Biswal

摘要

Spinel ferrite samples with the composition Mg0.5Mn0.5−xCuxFe1.98Er0.02O4 (x = 0, 0.02, 0.04, 0.06, and 0.1) were synthesized via the solid-state route and probed for microwave absorption applications. The compositional selection has been made with reference to our previous work given in the introduction section. X-ray diffraction combined with Rietveld refinement revealed a multiphase nature. The material is characterized by the coexistence of a cubic spinel phase and a secondary orthorhombic phase. SEM analysis showed that Cu doping significantly influence the grains with more uniform, faceted, and closely packed, reflecting enhanced diffusion and crystallization. AFM measurements indicated high surface roughness. The Cu doped material strongly affects the dielectric and magnetic properties. Favourable dielectric constant and loss factor values over a wide frequency range demonstrate the suitability of these materials for high-frequency applications. The Cu doped ferrites exhibit a broad distribution of relaxation times, enabling effective interaction with and absorption of an extended microwave frequency spectrum. UV-Vis spectroscopy revealed a decrease in the optical band gap from 2.32 eV to 2.26 eV upon Cu doping. The combined improvements in optical, dielectric, and thermal properties confirm that Er-substituted Cu-doped ferrites are promising candidates for high-frequency and high-temperature microwave-absorbing applications.