Search

We report an advanced chemical vapour deposition approach which yields not previously observed carbon-based foam-like films completely filled with a single phase of α-Fe. These films are found in the region of the chemical vapour deposition reactor where the temperature is relatively low (650–770 °C) and exhibit a high saturation magnetization as high as 200–220 emu/g at room temperature when small concentrations of Cl-radicals are added to the pyrolysing CVD system by mixing 0.15 ml of dichlorobenzene to ferrocene. Instead when the only ferrocene is used a lower saturation magnetization of 140–145 emu/g is found due to an amorphous arrangement of the Fe-phase in some parts of the foam. Also we show that for much higher concentration of Cl radicals (0.65 ml of dichlorobenzene mixed to ferrocene) a dramatic decrease of the quantity of crystalline α-Fe is found together with the formation of amorphous Fe and Fe x O x phases. [ABSTRACT FROM AUTHOR]

FePd and CoPd tetragonal ferromagnetic nanoparticles have recently attracted a great attention due to their large magneto-crystalline anisotropy of ∼10 8 erg/cm 3 ideal for fabrication of magnetic-arrays with giant-coercivities. However, no studies are reported on the fabrication of these alloys inside carbon nanotubes. Here we reveal the synthesis of the FePd 3 –Fe 0.037 Pd 0.963 –Fe 3 C inside carbon nanotubes by chemical vapor deposition of large quantities of ferrocene with low quantities of dichloro-cyclooctadiene-palladium and its transformation to Fe 0.438 Pd 0.561 through annealing. Instead, planar graphitic structures with embedded FePd 3 –Fe 0.037 Pd 0.963 or CoPd/CoPd 2 particles are found when large quantities of dichloro-cyclooctadiene-palladium are pyrolyzed with low quantities ferrocene or cobaltocene. [ABSTRACT FROM AUTHOR]