Synthesis and Magnetic Properties of Ni and Carbon Coated Ni by Levitational Gas Condensation (LGC)‎

الملخص EN

The nickel (Ni), and carbon coated nickel (Ni@C) nanoparticles were synthesized by levitaional gas condensation (LGC) methods using a micron powder feeding (MPF) system.

Both metal and carbon coated metal nano powders include a magnetic ordered phase.

The synthesis by LGC yields spherical particles with a large coercivity.

The abnormal initial magnetization curve for Ni indicates a non-collinear magnetic structure between the core and surface layer of the particles.

The carbon coated particles had a core structure diameter at and below 10 nm and were covered by 2-3 nm thin carbon layers.

The hysteresis loop of the as-prepared Ni@Cs materials with unsaturated magnetization shows a superparamagnetic state at room temperature.