Characterization of Fe-Ni(C) nanocapsules synthesized by arc discharge in methane

Ultrafine Fe-Ni(C) particles of various compositions were prepared by are d ischarge synthesis in a methane atmosphere. The particles were characterize d by x-ray diffraction, transmission electron microscopy, energy disperse s pectroscopy, chemical analysis, x-ray photoelectron spectroscopy, Mossbauer spectroscopy, and magnetization measurement. The carbon atoms solubilizing at interstitial sites in gamma-(Fe,Ni, C) solution particles have the effe cts of forming austenite structure and changing microstructures as well as magnetic properties. A carbon layer covers the surface of Fe-Ni(C) particle s to form the nanocapsules and protect them from oxidization, The mechanism of forming Fe-Ni(C) nanocapsules in the methane atmosphere was analyzed.