Effects of excessive Zn2+ ions on intrinsic magnetic and structural properties of Ni0.2Zn0.6Cu0.2Fe2O4 powder prepared by chemical coprecipitation method

摘要

Zn(OH)2 is a kind of amphoteric compound. Therefore, for chemical coprecipitation method, the precipitation of Zn2+ ions may be incomplete if using NaOH as precipitator. In this study, single-phase powder specimens with a nominal composition Ni0.2Zn0.6Cu0.2Fe2O4 were prepared with chemical coprecipitation method, and the effects of excessive Zn2+ content (x, x = 3%, 5%, 7%, 9%) in working solution on intrinsic magnetic and structural properties were studied by vibrating sample magnetometer and X-ray diffractometer, respectively. It was found that the magnetization when Hm = 398 kA/m (5000 Oe) reached a maximum when x = 5%, and then decreased with the increase of x, which was attributed to the effect of different amount of Zn2+ in A sites on the A–B and B–B exchange interaction. Moreover, it was found that the lattice parameter was affected by the Zn2+ and Fe3+ ions due to their different ion radius to a certain extent.