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Aristate spherical Ni nanoparticles with 5nm–65nm grain size range were synthesized via ultrasound reduction method using NiCl2·6H2O as raw materials, N2H4·H2O as reducing agent and PVP as surfactant. Phase and microstructure of as-synthesized Ni nanoparticles were characterized by X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM). Magnetic properties were measured...