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Perfect Single‐Crystal Alumina Microspheres
Author(s) -
Yang Weiyou,
Wang Huatao,
Cheng Xiaomin,
Xie Zhipeng,
An Linan
Publication year - 2008
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.1551-2916.2008.02483.x
Subject(s) - transmission electron microscopy , materials science , crystallite , scanning electron microscope , annealing (glass) , single crystal , polishing , diffraction , thermal decomposition , chemical engineering , crystallography , nanotechnology , composite material , chemistry , optics , metallurgy , physics , organic chemistry , engineering
We report the synthesis of perfect single‐crystal Al 2 O 3 microspheres via direct thermal decomposition of aluminum isopropoxide in air without any template or catalyst. The obtained microspheres were characterized using scanning electron microscopy, X‐ray diffraction, transmission electron microscopy, and selective area electron diffraction. The results suggested that the formation of the spheres can be attributed to a transition from polycrystalline to single‐crystalline symmetry during high‐temperature annealing. The obtained microspheres could be useful for many applications such as lubricants and polishing mediums.