文献类型：期刊文献

英文题名：Evolution of electron localization with Co2+variations in CoxFe3_xO4 hollow spheres for enhanced wave absorption

作者：Li, Shu[1];Guo, Shaoli[1];Chen, Guoxiang[1];Cui, Yan[2];Yang, Hangfan[1];Qiu, Jie[3];Wang, Zelin[1];Dai, Minghan[1];Liu, Shuai[1]

机构：[1]Xian Shiyou Univ, Coll Sci, Xian 710065, Shaanxi, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Shanghai Jiao Tong Univ, SJTU Paris Elite Inst Technol, Shanghai 200240, Peoples R China

年份：2025

卷号：1026

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20251618239247);WOS:【SCI-EXPANDED(收录号:WOS:001472077100001)】；

基金：This work is supported by the National Natural Science Foundation of China (Grant Nos. 11304246 and 12004301) , the Shaanxi Funda-mental Science Research Project for Mathematics and Physics (Grant Nos. 22JSY001 and 23JSQ018) , the China National Nuclear Corporation LingChuang Project (Grant No. 23GFC-JJ12-936) and the Postgraduate Innovation and Practical Ability Training Program of Xi'an Shiyou University (Grant No. YCS23113086) .

语种：英文

外文关键词：Electron localization; Magnetocrystalline anisotropy; Electromagnetic wave absorption; Ferrite

摘要：Substitution can cause changes in electromagnetic parameters thereby affecting the electromagnetic wave (EMW) absorption performance of the material. We inferred that the fundamental reason for the performance improvement is the transitions in the absorption mechanism, which is caused by the change in electronic structure that originated from the substitution. To confirm this, we prepared CoxFe3_xO4 (0 <= x <= 1) hollow microspheres and investigated its absorption performance in 2-18 GHz. Subsequently, a series of theoretical studies were carried out that focusing on the impact of increasing Co2+ substitution on the electrical and magnetic loss mechanisms, as well as the inherent relationship between the substitution and the absorption performance. The result indicates that in terms of dielectric loss, an increase in Co2+ substitution can induce a transition from conductivity loss to polarization loss by increasing the number of holes and strengthening the electron localization. Meanwhile, substitution results in a transformation from the eddy current loss to a magnetic resonance mode, and leads to an increase in magnetocrystalline anisotropy simultaneously, enhancing the magnetic loss ability. As a result, the transformation of electrical and magnetic loss mechanisms ultimately leads to an overall improvement in EMW absorption performance of CoxFe3_xO4, and CoFe2O4 hollow microsphere consequently realizes an extremely high attenuation performance of _ 72.3 dB at 2.67 mm. This work provides a deeper understanding of the intrinsic relationship between the macroscopic absorption performance of ferrite and its microscopic electronic structure, which can guide the synthesis of efficient ferrite absorbers.