Abstract

Nano ferrites have received considerable attentions due to their various applications such as magnetic or catalyst materials. In this work, nickel-cobalt ferrite (Co1-xNixFe2O4) 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 (Ms) and coercivity (Hc) 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.