Synthesis and Characterization of Fe-Co Alloy Nanoparticles

(Poster Contents)

 

John Henry J. Scott and Dale E. Newbury
 
Microanalysis Research Group
Surface and Microanalysis Science Division (837)
Chemical Science and Technology Laboratory

 

FeCo nanoparticles are synthesized using a radio frequency (RF) plasma torch. These alloy nanoparticles (~50 nm diameter) are nucleated in the gas phase from a vapor produced by evaporating much larger metal powder precursors (~10 µm diameter) in the thermal plasma. To study the effects of precursor homogeneity on the synthesis, two different starting materials were used: (1) pre-alloyed FeCo powder produced by inert gas atomization, and (2) a mixture of commercial elemental Fe and Co powders. X-ray powder diffraction, SEM, TEM, and x-ray microanalysis were used to characterize the morphology, structure, and chemical homogeneity of the precursors and products. Both starting materials produced alloy product, but nanoparticles produced from pre-alloyed precursors exhibit smaller variations in Fe/Co ratio than particles produced from elemental powders.