Power capacity enhancement and loss reduction induced by limited solid solubility of Ho^(3+)rare-earth substitution in NiCuZn spinel ferrites  

作　　者：Hanyu Zhang Qifan Li Xiaona Jiang Chuanjian Wu Ke Sun Zhongwen Lan Zhong Yu 

机构地区：[1]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China

出　　处：《Journal of Advanced Ceramics》2024年第10期1655-1665,共11页先进陶瓷（英文）

基　　金：supported by the National Natural Science Foundation of China(No.52172267);the Science and Technology DepartmentofSichuanProvince(Nos.2022JDTD0018,24NSFSC6165,and 24ZHSF0391);the Sichuan Province Engineering Research Center for Broadband Microwave Circuit High Density Integration(No.BMERC004-2023-07);the Science and Technology Department of GuiZhou Province(No.QKHZC[2022]-055);the China Electronics Technology Group Corporation Ninth Research Institute(No.2024SK-001-1).

摘　　要：The application of NiCuZn ferrites(NCZFs)in high-power communication systems is constrained by their nonlinear excitation.To reduce nonlinear effects,it is essential for ferrite materials to possess a relatively high spin-wave linewidth(ΔH_(k)).Doping with ions such as cobalt and rare-earth(RE)ions with fast relaxation has proven effective in increasingΔH_(k)of ferrites.However,the regulatory mechanism of doping NCZFs with RE ions with larger ionic radii remains unclear.In this study,Ho^(3+)-substituted NCZFs were synthesized via a solid-state reaction route.The spatial distribution and substitution amount of the Ho^(3+)ions were carefully investigated via elemental and phase composition analysis,revealing the limited solid solubility of the Ho^(3+)ions in NCZFs.Some of the Ho^(3+)ions enter the lattice and occupy the octahedral sites,accelerating relaxation and increasingΔH_(k)to a maximum value of 2.63 kA·m^(-1).Insoluble Ho^(3+)ions combine with Fe^(3+)ions to form a HoFeO3 heterogeneous phase with Fe^(3+)ions at the grain boundaries,leading to iron deficiency within NCZF crystals and significantly reducing the dielectric loss tangent at microwave frequencies.These results reveal the great potential of Ho^(3+)-substituted NCZFs for high-power,low-loss microwave applications.

关 键 词：NiCuZn ferrites(NCZFs) rare earth solid solubility spin-wave linewidth dielectric loss 

分 类 号：TQ174[化学工程—陶瓷工业]