Cr-substitution effect on the structural and magnetic properties of nano-sized NiFe2O4 prepared via novel chitosan route

被引：27

作者：

Gabal, M. A. ^{[1
]}

Kosa, S. ^{[1
]}

Almutairi, T. S. ^{[1
]}

机构：

[1] King Abdulaziz Univ, Fac Sci, Dept Chem, Jeddah 80203, Saudi Arabia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2014年 / 356卷

关键词：

Cr-substituted; NiFe2O4; Chitosan route; Cation distribution; VSM; CATION DISTRIBUTION; FERRITES;

D O I：

10.1016/j.jmmm.2013.12.044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nano-crystalline Cr-substituted nickel ferrites; NiFe2-xCrxO4 (x=0.0-1.0) were prepared using chitosan template method. Differential thermal analysis-thermogravimetric measurements revealed the complete combustion of the gel precursor at 220 degrees C. X-ray diffraction (XRD) of the as-prepared precursors exhibited the presence of secondary phases besides the entire ferrites. XRD of the calcined precursors at 500 degrees C indicated single-phase cubic spinel structure for all the prepared samples. The lattice parameter are slightly changed with increasing Cr-content while the particle size and X-ray density gradually decreases. Vibrating sample magnetometer measurements confirmed that Cr-substitution caused a decrease in the saturation magnetization while increasing coercivity. The higher magnetizations obtained compared with other methods in literature enhances using of chitosan as a template for the preparation of other systems. The relatively high coercivity values suggested higher demagnetization magnetic field of the investigated samples. The expected chitosan complexation mechanism as well as the auto-combustion reaction were discussed. A proper cation distribution of the investigated system was suggested through structural data and was confirmed by magnetization studies. (C) 2013 Elsevier B.V. All rights reservecl

引用

页码：37 / 41

页数：5

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