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Barium Carbonate Phase on the Surfaces of Barium Titanate Particles and in Situ Transmission Electron Microscopy Observation of Its Decomposition
Author(s) -
Nakano Hiromi,
Urabe Kazuyori,
Ikawa Hiroyuki
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.tb03368.x
Subject(s) - barium carbonate , crystallite , transmission electron microscopy , barium titanate , materials science , phase (matter) , barium , mineralogy , scanning electron microscope , electron microscope , analytical chemistry (journal) , ceramic , crystallography , chemistry , optics , nanotechnology , composite material , metallurgy , raw material , physics , organic chemistry , chromatography
A BaCO 3 phase is found on the surfaces of hydrothermally synthesized BaTiO 3 particles; it occurs as aggregates or small protuberances. A small proportion of the phase decomposes to BaO crystallites when heated by a convergent electron beam in a transmission electron microscope. The BaO and BaCO 3 crystallites disappear when they are irradiated successively by the convergent electron beam. The BaO crystallites and the BaCO 3 phase sublimate and/or react with BaTiO 3 crystals whose surface layers are deficient in Ba 2+ ions.