Synthesis of nano Co1-xNixFe2O4 by sol-gel method and its properties

Abstract

Nano ferrites have received considerable attentions due to their various applications such as magnetic or catalyst materials. In this work, nickel-cobalt ferrite (Co_1-xNi_xFe₂O₄) was synthesized by sol-gel method using stearic acid. The effects of calcination temperature and nickel/cobalt ratios on the formation of structure were also investigated. XRD results show that all samples which were calcined from 6000C to higher temperature for 1 hour were in single cubic spinel phases. The magnetic properties include saturation magnetization (M_s) and coercivity (H_c) have been also investigated by using vibrating sample magnetometer (VSM). The saturation magnetization and coercivity of CoFe₂O₄ calcined at 600⁰C for 1hour is 74.4 emu/g and 1519.13 Oe, respectively. The saturation magnetization and coercivety of substituted materials decrease with increasing Ni content.