Site-controlled multi-ion substitution enabling low-loss and high-permittivity microwave ferrites
Modern wireless communication and radar systems urgently require the application of low-loss and high-permittivity yttrium iron garnet (YIG) ferrite for highly efficient and integrated microwave circulators, isolators, filters, etc. However, achieving a high dielectric constant, low dielectric loss,...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Tsinghua University Press
2025-05-01
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| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2025.9221076 |
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| Summary: | Modern wireless communication and radar systems urgently require the application of low-loss and high-permittivity yttrium iron garnet (YIG) ferrite for highly efficient and integrated microwave circulators, isolators, filters, etc. However, achieving a high dielectric constant, low dielectric loss, and narrow ferromagnetic resonance (FMR) linewidth simultaneously is challenging. Here, we synthesized Bi–Ca–Zr co-substituted YIG ferrites and comprehensively investigated the effects of multi-ion substitution on the polycrystalline microstructure and microwave electromagnetic properties of the material. The introduction of Bi3+ ions at the crystallographic dodecahedral sites enhances the electronic polarization of single Fe3+ ions and the superexchange interaction between them. The substitution ofZr4+ ions for Fe3+ ions at octahedral sites suppresses the FMR linewidth broadening caused by magnetocrystalline anisotropy. Moreover, multi-ion substitution results in competition between liquid phase sintering and grain boundary pinning and influences the densification and grain growth processes, resulting in a non-uniform and dense microstructure composed of crystallites with a bimodal size distribution. This distinctive morphology further contributes to FMR linewidth reduction and permittivity increase. The optimized Bi–Ca–Zr co-substituted YIG ferrite has a narrow FMR linewidth of 33 Oe, high permittivity of 27, and high Curie temperature of 200 °C, making it a promising candidate for next-generation microwave devices. |
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| ISSN: | 2226-4108 2227-8508 |