Influence of trivalent (Gd³⁺, Cr³⁺) ion substitution on the structural and magnetic properties of Ni_0.4Zn_0.6Cr_0.5Gd_xFe_1.5-xO₄ ferrite nanoparticles
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 Ni_0.4Zn_0.6Cr_0.5Gd_xFe_1.5-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 (M_s), remanence magnetisation (M_r) and coercivity (H_c) 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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