| Authors | Ghader Ahmadpour-Farzad Nasirpouri-Mohmmad Javad Eshraghi-Mohmmad Reza Vaezi |
|---|---|
| Conference Title | Proceedings of the 7th International Conference on Nanostructures (ICNS7) |
| Holding Date of Conference | 2018-3-1 |
| Event Place | Tehran |
| Presentation | POSTER |
| Conference Level | International Conferences |
Abstract
Abstract
In this work, we synthesized Nd-Fe-B based magnetic nanoparticles by means of a Pechini-type sol-gel process. First a suitable gel-precursor was prepared using respective metal salts and complexing agents such as citric acid (CA) and ethylene glycol (EG). Molar ratio of citric acid and ethylene glycol to metal salts were selected as 2:1. The gel obtained was dried and then calcinated and sintered for obtaining Nd-Fe-B oxide powders. Nd-Fe-B oxide powders were reduced in a mixture of H2 and argon atmosphere at 800℃ for different times of 2, 6 and, 8h to prepare Nd-Fe-B magnetic nanoparticles. The effect of reduction time on morphology, structural and magnetic properties of Nd-Fe-B nanoparticles was studied by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and vibrating sample magnetometer (VSM). The results showed that Nd-Fe-B oxide powder is composed of Fe2O3, NdFeO3 and NdBO3 phases with saturation magnetization (Ms) and coercivity (Hc) 0.37 emu/g and 700 Oe, respectively. The XRD pattern confirmed the formation of Nd-Fe-B alloy nanoparticles for oxide powders reduced for 6h. FE-SEM micrograph of Nd-Fe-B nanoparticles synthesized indicated the morphology of flower-like and particles size below 30 nm. With an increase in reduction time from 2h to 8h, Ms increased and Hc decreased.