Synthesis of Nano Crystalline Ni and Fe by Levitational Gas Condensation Method

Nanocrystalline Ni and Fe were synthesized by the levitaional gas condensation (LGC) method using wire feeding (WF) and micron powder feeding (MPF) systems. The magnetic properties have been characterized using a vibrating sample magnetometer (VSM) and Moumlssbauer spectroscopy. The X-ray diffraction and saturation magnetization results indicate the small amount of oxidized phases such as amorphous NiO and Fe
₃
O
₄
on the surface of metal powders. The size and shape of the nano powders were investigated by transmission microscopy (TEM). It was found that particles have a mean crystallite size about 22 and 24 nm for Fe and Ni. The surface effect might influence the magnetic hysterisis behavior of Ni and Fe