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Biswajita Dash, Krutika L. Routray, Sunirmal Saha, P.M. Sarun, and Subhasis Sarangi, Insights into the effects of Mn substitution in CoFe2O4 nanoferrites involving high-frequency storage device applications, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-024-3040-3
Biswajita Dash, Krutika L. Routray, Sunirmal Saha, P.M. Sarun, and Subhasis Sarangi, Insights into the effects of Mn substitution in CoFe2O4 nanoferrites involving high-frequency storage device applications, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-024-3040-3
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Mn替代对CoFe2O4纳米铁氧体高频存储器件性能的影响

摘要: 采用溶胶–凝胶自燃烧法合成了CoMnxFe(2–x)O4系列(x = 0.00、0.05、0.10、0.15、0.20)纳米铁氧体。晶格常数估算在8.312–8.406Å之间,而Scherrer方法估计晶粒尺寸在55.20和31.40 nm之间。通过傅里叶变换红外光谱(FTIR)分析发现,不同官能团与不同的吸收带相关。通过拉曼光谱确定了5种活性模式,揭示了氧离子在四面体和八面体位置的振动模式。在所有样品中都观察到的铁磁磁滞回线,可以用Neel模型来解释。结果表明,Fe2+位置的交流电导率随Mn2+含量的增加而降低,而介电常数和介电损耗随频率的增加而增加。随着Mn2+掺杂量的增加,样品的饱和磁化强度(Ms)、剩余磁化强度(Mr)和矫顽力(Hc)均呈下降趋势。CoMn0.20Fe1.8O4样品的MsMr值分别为73.12~66.84 emu/g和37.77~51.89 emu/g,Hc值为1939~1312 Oe,矫顽力增大。因此,CoMn0.20Fe1.8O4样品可以被认为是一种很有潜力的磁性材料。

 

Insights into the effects of Mn substitution in CoFe2O4 nanoferrites involving high-frequency storage device applications

Abstract: Nanoferrites of the CoMnxFe(2–x)O4 series (x = 0.00, 0.05, 0.10, 0.15, 0.20) were synthesized in this study using the sol–gel auto-combustion approach. The lattice constants were computed within the range of 8.312–8.406 Å, while crystallite sizes were estimated to range between 55.20 and 31.40 nm using the Scherrer method. The different functional groups were found to correlate with various absorption bands using Fourier transform infrared (FTIR) spectroscopy. Five active modes were identified by Raman spectroscopy, revealing vibration modes of O2− ions at tetrahedral and octahedral locations. The ferromagnetic hysteresis loop was observed in all the synthesized samples, which can be explained by Neel’s model. The results showed that AC conductivity decreased with increasing Mn2+ content at the Fe2+ site, while the dielectric constant and dielectric loss increased with increasing frequency. Furthermore, the saturation magnetization (Ms), remnant magnetization (Mr), and coercivity (Hc) all showed declining trends with the increase in Mn2+ doping. Finally, the CoMn0.20Fe1.8O4 samples showed Ms and Mr values ranging from 73.12 to 66.84 emu/g and from 37.77 to 51.89 emu/g, respectively, while Hc values ranged from 1939 to 1312 Oe, after which coercivity increased. Thus, the CoMn0.20Fe1.8O4 sample can be considered a promising candidate for magnetic applications.

 

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