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Microwave Plasma Synthesis of Nanostructured γ‐Al 2 O 3 Powders
Author(s) -
Fu L.,
Johnson D. Lynn,
Zheng Jian G.,
Dravid Vinayak P.
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03532.x
Subject(s) - materials science , particle size , scanning electron microscope , particle (ecology) , phase (matter) , analytical chemistry (journal) , electron microscope , x ray crystallography , diffraction , nanoparticle , transmission electron microscopy , chemical engineering , crystallography , chemistry , nanotechnology , composite material , chromatography , oceanography , physics , organic chemistry , optics , engineering , geology
Nanostructured Al 2 O 3 powders have been synthesized by combustion of aluminum powder in a microwave oxygen plasma, and characterized by X‐ray diffraction and electron microscopy. The main phase is γ‐Al 2 O 3 , with a small amount of δ‐Al 2 O 3 . The particles are truncated octahedral in shape, with mean particle sizes of 21–24 nm. The effect of reaction chamber pressure on the phase composition and the particle size was studied. The γ‐alumina content increases and the mean particle size decreases with decreasing pressure. No α‐Al 2 O 3 appears in the final particles. Electron microscopy studies find that a particle may contain more than one phase.