Impact of Co^(2+)substitution on structure and magnetic properties of M-type strontium ferrite with different Fe/Sr ratios  

作　　者：Yang Sun Ruoshui Liu Huayang Gong Baogen Shen 孙洋;刘若水;宫华扬;沈保根(School of Rare Earths,University of Science and Technology of China,Hefei 230026,China;Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China;Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]School of Rare Earths,University of Science and Technology of China,Hefei 230026,China [2]Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China [3]Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China [4]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Physics B》2024年第10期427-433,共7页中国物理B（英文版）

基　　金：support from the Research Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences(Grant No.E355B001);Key Research Program of the Chinese Academy of Sciences(Grant No.ZDRW-CN-2021-3);Science Center of the National Natural Science Foundation of China(Grant No.52088101).

摘　　要：Ion substitution has significantly improved the performance of ferrite magnets,and cobalt remains a key area of research.Studies on the mechanism of Co^(2+)in strontium ferrite,especially SrFe_(2n-x)Co_(x)O_(19-d)(n=6.1-5.4;x=0.05-0.20)synthesized using the ceramic method,showed that Co^(2+)preferentially enters the lattice as the Fe/Sr ratio decreases.This results in a decrease in the lattice constants a and c due to oxygen vacancies and iron ion deficiency.The impact of Co substitution on morphology is minor compared to the effect of the Fe/Sr ratio.As the Fe/Sr ratio decreases and the Co content increases,the saturation magnetization decreases.The magnetic anisotropy field exhibits a nonlinear change,generally increasing with higher Fe/Sr ratios and Co content.These changes in the performance of permanent magnets are attributed to the absence of Fe^(3+)ions at the 12k+2a and 2b sites and the substitution of Co^(2+)at the 2b site.This suggests that by adjusting the Fe/Sr ratio and appropriate Co substitution,the magnetic anisotropy field of M-type strontium ferrite can be effectively optimized.

关 键 词：HEXAFERRITE Co substitution Raman spectra magnetic properties 

分 类 号：O469[理学—凝聚态物理]