Structural and Magnetic Properties of BaCo_xFe_12xO₁₉ (x = 0.2, 0.4, 0.6, &1.0) Nanoferrites Synthesized via Citrate Sol-Gel Method

Sonal Singhal, Kirandish Kaur, Sheenu Jauhar, Santosh Bhukal, S Bansal

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Department of Chemistry, Panjab University, Chandigarh – 160 014, INDIA.

DOI: 10.4236/wjcmp.2011.13016                

Abstract

Cobalt substituted barium ferrites, BaCo_xFe_12-xO₁₉ (x = 0.2, 0.4, 0.6 & 1.0) have been synthesized via citrate sol-gel method. All the samples have been annealed at 1000℃ and characterized using Fourier Transform Infra Red spectroscopy, X-Ray Diffractography and Vibrating Sample Magnetometry. The FT-IR spectra of the samples exhibit two frequency bands in the range of 580 cm^-1 and 460 cm^-1, corresponding to the formation of metal oxides. The XRD studies reveal a crystallite size of ~55 nm. The saturation magnetization decreases from 96.3 emu/g to 47.8 emu/g with increasing concentration of cobalt due to the lower magnetic moment of Co²⁺ (3 µB) as compared to Fe³⁺ (5 µB). The coercivity values also show a decreasing behaviour from 3800 Oe to 1750 Oe with increasing cobalt concentration due to reduced magnetocrystalline anisotropy.

Keywords

Barium Ferrite, Magnetic Moment, Coercivity, XRD

Conflicts of Interest

The authors declare no conflicts of interest.

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