Narrow Results

Recent investigations suggest that forsterite ceramics possess good biocompatibility and mechanical properties and might be suitable for potential application like bone implant material. In this study, nanocrystalline forsterite (Mg₂SiO₄) powder was prepared by mechanochemical method and subsequent heat treatment and the effect of fluorine ion as catalyst was studied. Mechanochemical process and heat treatment were done on the MgCO₃, SiO₂ and (NH₄)₂SiF₆ powders. The synthesized powders were characterized by X-ray diffraction (XRD), thermogravimetric (TG) analyses and scanning electron microscopy (SEM). The synthesized nano-powder had particle size smaller than 100 nm. The crystallite size of powders after 5 hours mechanical activation was 18 nm. Mechanical activation in the presence of fluorine ion affects the mechanism of forsterite formation and increase the rate of decomposition of MgO and fabrication of forsterite.

In this study, the effects of the molarity of the precipitating agent on the synthesis of nanostructured NiFe₂O₄ powders by coprecipitation, followed by calcination were investigated and its optimum amount was also determined. Ni-ferrite powder was synthesized for the first time by dissolving Fe and Ni chlorides and ammonium ferrous sulfate in deionized water with different molar proportions. While stirring, the precipitating agent of NaOH was added to the solution with different molarities and after 1 hour of aging, the resultant precipitate was washed with deionized water and acetone.

It was concluded that single phase nickel ferrite nanocrystalline powders can be prepared by use of 2.2M NaOH, with crystallite size of 30-50 nm.