Synthesis and characterisation of Bi-substituted magnetite nanoparticles

Single phase magnetite nanoparticles and Bi-substituted ones were prepared by mechanochemicalprocessing (MCP). The effects of Bi-substitution on the structural and magnetic properties of the nanoparticles werestudied by X-ray diffraction (XRD) and magnetometry, respectively. The XRD results showed thatall samples havespinel phase and by increasing Bi content, the main diffraction peaks were shifted to higher angles, which means thelattice parameter decreases from 0.843 to 0.838 nm and then increases to 0.841 nm. Also, the effect of increasing Bicontent on saturation magnetization was investigated. The results revealed that increasing Bi content lead to a decreasein saturation magnetization (Ms) from 74.9to 48.8 emug-1 and an increase in coercivity (Hc) from 96.8 to 137.1 Oe.

کلیدواژه ها:

Bi-substituted magnetite nanoparticles ، mechanochemical processing ، spinel structure ، X-ray Diffraction