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The control of the crystalline phases of the nanoparticles grown in adirect-current transferred-arc plasma-assisted reactor is reported. Thecrystalline phases of the as synthesized nanoparticles are shown to criticallydepend on the operating gas pressure. The paper reports about the change in thecrystalline phases of three distinct compounds namely aluminium oxide (Al2O3),aluminium nitride (AlN) and iron oxide (FexOy). The major outcome of thepresent work is that the phases having higher defect densities are moreprobable to form at the sub-atmospheric operating pressure. The variations inthe crystalline structures are discussed on the basis of the equilibrium defectdensity formed during the homogeneous nucleation. The as synthesizednanoparticles were examined by X-ray diffraction analysis and transmissionelectron microscopy. In addition, the confirmatory analysis for the crystallinephases of the as synthesized iron oxides was carried out with the help ofMossbauer spectroscopy.

DC transferred arc thermal plasma assisted growth of nanoparticles with different crystalline phases