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Effects of Composition on the Reaction Kinetics of Hydrothermally Derived Barium Strontium Titanate
Author(s) -
Xu Huiwen,
Karadibhave Sreedhar,
Slamovich Elliott B.
Publication year - 2007
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.1551-2916.2007.01765.x
Subject(s) - nanocrystalline material , strontium , materials science , kinetics , mineralogy , particle size , strontium titanate , aqueous solution , barium , chemical engineering , titanate , analytical chemistry (journal) , chemistry , nanotechnology , ceramic , thin film , metallurgy , chromatography , physics , organic chemistry , quantum mechanics , engineering
Barium strontium titanate (BST, Ba x Sr 1− x TiO 3 ) powders were fabricated by reacting nanocrystalline TiO 2 with aqueous alkaline solutions containing Ba and Sr at 80°C. Measurements of reaction kinetics showed that Ba‐rich BST compositions exhibited more rapid reaction rates compared with Sr‐rich BST compositions, and the reaction rate increased monotonically with increasing Ba content. The average particle size also increased with increasing Ba content, with the particle growth rate of BaTiO 3 being approximately a factor of 10 greater than SrTiO 3 . The increase in growth rate from Sr‐rich to Ba‐rich BST corresponded to a morphological transition from 20 to 30 nm cuboidal particles to 80 nm raspberry‐like particles, respectively.