Abstract
Nanocrystalline alumina (Al 2O 3) powder has been synthesized by the d.c. arc plasma method at atmospheric conditions using aluminium electrodes. Structural characterization by X-ray diffraction and transmission electron microscopy confirmed the ultrafine nature of the particulates. Investigation of the size distribution revealed a long-normal behaviour of the nanoparticles. Chemical analysis of the particulates was carried out using X-ray photoemission spectroscopy. The Al 2p core level spectrum revealed the presence of unreacted Al 0, in addition to Al 3+, suggesting a core of Al 0 surrounded by a layer of Al 2O 3 as the particle structure.
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