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Sol‐Gel Process for the Preparation of Ba 2 Ti 9 O 20 and BaTi 5 O 11
Author(s) -
Lu Hsinchun,
Burkhart Lawrence E.,
Schrader Glenn L.
Publication year - 1991
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.1151-2916.1991.tb04329.x
Subject(s) - alkoxide , barium , raman spectroscopy , materials science , sol gel , barium titanate , titanium , x ray crystallography , phase (matter) , stoichiometry , titanate , analytical chemistry (journal) , mineralogy , inorganic chemistry , diffraction , chemistry , catalysis , ceramic , metallurgy , nanotechnology , optics , biochemistry , chromatography , physics , organic chemistry
Barium titanate precursors with Ba/Ti ratio 2:9 and 1:5 were prepared by first hydrolyzing titanium alkoxide and then mixing the resulting titania sol with a barium alkoxide‐methanol solution. After drying, the xerogels of the precursors of barium titanates were sintered at temperatures from 700°C (4 h) to 1200°C (110 h or longer). Characterization of the product was performed using X‐ray diffraction and laser Raman spectroscopy. At 700°C, BaTi 5 O 11 was formed from the 1:5 precursor and a two‐phase mixture of BaTi 2 O 5 and BaTi 5 O 11 was formed from the 2:9 precursor. After prolonged heating at 1200°C, the latter mixture converted to a single‐phase material, Ba 2 Ti 9 O 20 .