Bismuth titanate from coprecipitated stoichiometric hydroxide precursors

The effect of pH on the formation of stoichiometric precursors for bismuth titanate was investigated by thermal analysis using Bi(NO 3) 3 and potassium titanyl oxalate as starting materials. Precipitate obtained at pH=5.0 corresponded to a physical mixture of BiO(HC 2O 4) and TiO(OH) 2H 2O in the ra...

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Bibliographic Details
Published in:Materials letters 2000-06, Vol.44 (3), p.175-180
Main Authors: Umabala, A.M, Suresh, M, Prasadarao, A.V
Format: Article
Language:English
Subjects:
Bi 4Ti 3O 12
Bismuth titanate
Chemistry
Coprecipitation
Exact sciences and technology
Inorganic chemistry and origins of life
Potassium titanyl oxalate
Preparations and properties
Salts
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Summary:The effect of pH on the formation of stoichiometric precursors for bismuth titanate was investigated by thermal analysis using Bi(NO 3) 3 and potassium titanyl oxalate as starting materials. Precipitate obtained at pH=5.0 corresponded to a physical mixture of BiO(HC 2O 4) and TiO(OH) 2H 2O in the ratio of 4:3, but on pyrolysis this did not yield phase pure Bi 4Ti 3O 12. However, at 1 M NH 4OH stoichiometric mixture of 4Bi(OH) 3+3TiO(OH) 2H 2O was obtained by reverse titration and the precipitate on pyrolysis at 750°C yielded phase pure Bi 4Ti 3O 12.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(00)00022-7