Hydroxyapatite/NiFeO superparamagnetic composite: Facile synthesis and adsorption of rare elements.

A magnetic hydroxyapatite composite (CaHAP/NF) derived from calcium hydroxyapatite [Ca(PO)(OH)] and nickel ferrite [NiFeO] was successfully synthesized by a coprecipitation method. The synthesized composite was characterized using Fourier transform infrared spectroscopy (FT-IR), X-Ray diffractometer (XRD), thermogravimetric differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). Results clarify that the composite is a crystalline in nature, thermally stable up to 800 °C and possesses a high porous structure.