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Vacancy-engineered lithium ferrites for high-power microwave applications

delete2025-09-15
delete0
PRE
AI
M
Mingchao Yang
L
Lijun Jia *
H
Hongwei Li
Z
Zhihao Chen
X
Xuening Han
W
Wei Xiang
R
Rui Luo
Z
Zhenghao Shao
H
Huaiwu Zhang
DOI：10.1016/j.ceramint.2025.09.209delete
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Abstract

Abstract

En 中文
To meet the challenges of high power and low loss in the new-generation microwave systems, novel Li0.42Zn0.35Ti0.19MnxBi0.003Fe1.927O4-δ (x = 0.00–0.14) ferrites were synthesized by the solid-state reaction method. It was found that ionic vacancy engineering could effectively enhance the microwave properties of the ferrites. Compared to the lithium ferrite without Mn3+ ion addition, the specimen with x = 0.08 achieved a 70 % increase in the spin-wave linewidth (ΔHk) and a 31 % decrease in the ferromagnetic resonance linewidth (ΔH) at 9.26 GHz. The enhanced ΔHk was attributed to the “slow relaxation” effect of Mn3+ ions and the grain refinement due to the decreased cation vacancies. The reduced ΔH was related to the weakened internal superexchange effect, which was caused by the increased O2− anion vacancies and the substitution of Mn3+ ions for Fe3+ ions at the octahedral sites. This work provides a new idea to prepare microwave ferrites with high ΔHk and low ΔH.

Journal

Ceramics International cover
Ceramics International
IF:
5.6
Papers:
5.0W
Citations:
15.5W

Organization

No organization information available