Structural and magnetic properties of nano nickel-zinc ferrite synthesized by reverse micelle technique

被引:132
作者
Thakur, Sangeeta [1 ]
Katyal, S. C. [1 ]
Singh, M. [2 ]
机构
[1] Jaypee Univ Informat Technol, Waknaghat 173215, India
[2] Himachal Pradesh Univ, Dept Phys, Shimla 171005, Himachal Prades, India
关键词
Magnetic nanoparticle; Reverse micelle; Superparamagnetism; HYDROTHERMAL SYNTHESIS; GAMMA-FE2O3; NANOPARTICLES; PARTICLES; NANOWIRES; MOSSBAUER; TEMPLATE; DISORDER; BEHAVIOR; SHAPE;
D O I
10.1016/j.jmmm.2008.07.009
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanocrystalline nickel-zinc ferrites (Ni0.58Zn0.42Fe2O4) at different pH values (less than 9.6, 9.6, 10.96, and 11.40) for the alkali-precipitating reaction were synthesized by reverse micelle technique. X-ray diffraction reveals a well-defined nickel-zinc ferrite crystal phase at pH 9.6. Increase in pH value obstructs pure-phase formation and results in partial formation of alpha-Fe2O3. The magnetic behaviour of the samples was studied by superconducting quantum interference device. All the samples show superparamagnetic behaviour at room temperature (300 K) and negligible hysteresis at low temperature (5 K). The low value of saturation magnetization is explained on the basis of spin canting. The high-field irreversibility and shifting of the hysteresis loop detected in single-phase sample has been assigned to a spin-disordered phase, which has a spin-freezing temperature of approximately 42 K and other two samples have an antiferromagnetic phase (alpha-Fe2O3) coupled to the ferromagnetic phase. (c) 2008 Elsevier B. V. All rights reserved.
引用
收藏
页码:1 / 7
页数:7
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