Abstract
Novel chain-like CoNi alloy microstructures have been successfully prepared via a solvothermal route at 155°C with the assistance of polyvinylpyrrolidone (PVP) as a growth directing agent. The resulting samples were characterized by XRD, SEM, and VSM techniques. The effects of synthetic parameters including PVP dosage and reaction time on the morphologies of the obtained CoNi were investigated in details. It was found that PVP and solvent of ethylene glycol (EG) played critical roles in the formation of such CoNi microchains. These CoNi chains possessed face-centered cubic (fcc) phase with length up to 50μm, and the possible formation mechanism of such structure was also discussed. Magnetic hysteresis measurements at room temperature revealed the ferromagnetic behavior with a saturation magnetization of 90.3emu/g and a coercivity of 162.4Oe.
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