Influence of trivalent (Gd3+, Cr3+) ion substitution on the structural and magnetic properties of Ni0.4Zn0.6Cr0.5GdxFe1.5-xO4 ferrite nanoparticles Online publication date: Sun, 24-Sep-2017
by M.K. Anupama; B. Rudraswamy; N. Dhananjaya
International Journal of Nanotechnology (IJNT), Vol. 14, No. 9/10/11, 2017
Abstract: We report on the influence of Gd3+ and Cr3+ doped nanocrystalline ferrite materials with a general formula of Ni0.4Zn0.6Cr0.5GdxFe1.5-xO4 (where x = 0.00, 0.02, 0.04, 0.06) have been synthesised by solution combustion method using oxylyl dehydrazide (ODH) as a fuel. The structural and magnetic properties of the samples were characterised by X-ray diffractometer (XRD), Fourier transform infrared (FTIR) spectroscopy and vibrating sample magnetometer (VSM). The XRD analysis of the as synthesised sample reveals single phase with spinel cubic structure (Fd-3m space group) and the average crystalline sizes of the nanoparticle were estimated using Debye Scherrer's formula and found to be 19-34 nm. The FTIR results show the functional groups of Ni-Zn ferrite the two main spectroscopic bands corresponding to lattice vibrations were observed in the wavelength range from 300 cm-1 to 1000 cm-1. The absorption bands at 577 cm-1 and 380 cm-1 were assigned to tetrahedral (A) and octahedral (B) groups respectively in all the samples. Also IR spectrum shows that Gd3+ occupies the octahedral B-sites. Magnetic parameters such as saturation magnetisation (Ms), remanence magnetisation (Mr) and coercivity (Hc) were measured from the hysteresis loop. The saturation magnetisation increases for x = 0.00, 0.02 and decreases. This kind of ferrites could be used to prepare magnetic fluids and also used for high frequency applications.
Online publication date: Sun, 24-Sep-2017
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