Abstract
Nanocrystalline Al doped nickel-cobalt ferrite [Ni0.6Co0.4Fe2-xAlxO4 (x = 0.0, 0.1, 0.3, 0.5 and 0.7)] powders have been synthesized by sol-gel auto-ignition method and the effect of non-magnetic aluminum content on the nanosize particles and magnetic properties has been studied. The X-ray diffraction (XRD) revealed that the powders obtained are single phase with inverse spinel structure. The calculated grain size from XRD data have been verified using transmission electron microscopy (TEM). TEM photograph shows that the powders consist of nano meter sized grain. The size of nanoparticles decreases as the non magnetic Al content increases. Magnetic hysteresis loops were measured at room temperature with maximum applied magnetic field of 20 KOe. As aluminum content increases, the measured magnetic hysteresis curves became narrow and saturation magnetization (Ms), and coercive force (Hc) decreased. The reduction of magnetization with the increase of aluminum content is caused by non-magnetic Al3+ ions and weakened interaction between sub-lattices.
Highlights
Magnetic nanoparticles are of great technological importance because of their use in magnetic fluid, information storage system, medical diagnosis and their interest in fundamental science, especially for addressing the fundamental relationships between magnetic properties and their crystal structure [1].Recently, several methods were used to synthesize highly crystalline and uniformly sized magnetic nanoparticles of mixed ferrite [2,3]
A close examination of X-ray diffraction (XRD) patterns reveal that the diffraction peaks became broader with increasing aluminum content x, which may be due to distribution of nanocrystallinity
The XRD pattern shows the formation of single phase cubic spinel structure for all the samples
Summary
Magnetic nanoparticles are of great technological importance because of their use in magnetic fluid, information storage system, medical diagnosis and their interest in fundamental science, especially for addressing the fundamental relationships between magnetic properties and their crystal structure [1]. Several methods were used to synthesize highly crystalline and uniformly sized magnetic nanoparticles of mixed ferrite [2,3]. Most of these methods cannot be applied to a large scale and economic productions, because they require expensive and toxic reagents, complicated synthetic steps, high reaction temperature and long reaction times. Sol-gel method stands out as an alternative and highly promising method of preparation.
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