Preparation of nanosized particles of FeNi and FeCo alloy in solution

FeNi and FeCo alloys of different compositions are prepared at room temperature in solution by surface catalysis or high-pressure inducement. Their sizes and morphologies are analyzed with X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectroscopy (XPS). The phase transformations of these alloys are similar to the reported phase diagrams of FeNi and FeCo alloys. HRTEM image of FeCo 4 alloy shows the presence of rods. Their magnetic properties are studied. Surprisingly, the coercivity of FeCo 4 alloy reaches as high as 718 Oe.