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Microstructure of Varistors Prepared with Zinc Oxide Nanoparticles Coated with Bi 2 O 3
Author(s) -
Yuan Fangli,
Ryu Hojin
Publication year - 2004
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.1551-2916.2004.00736.x
Subject(s) - materials science , microstructure , zinc , transmission electron microscopy , nanoparticle , scanning electron microscope , grain size , chemical engineering , particle size , homogeneous , crystallite , oxide , layer (electronics) , mineralogy , nanotechnology , metallurgy , composite material , chemistry , physics , engineering , thermodynamics
Zinc oxide (ZnO) nanoparticles coated with 1–5 wt% Bi 2 O 3 were prepared by precipitating a Bi(NO 3 ) 3 solution onto a ZnO precursor. Transmission electron microscopy showed that a homogeneous Bi 2 O 3 layer coated the surface of the ZnO nanoparticles and that the ZnO particle size was ∼30–50 nm. Scanning electron microscopy showed that ZnO grains sintered at 1150°C were homogeneous in size and surrounded by a uniform Bi 2 O 3 layer. When the ZnO grains were surrounded fully by Bi 2 O 3 liquid phases, further increases in the ZnO grain size were not affected by the Bi 2 O 3 content. This predesigned ZnO nanoparticle structure was shown to promote homogeneous ZnO grains with perfect crystal growth.