Is the ubiquitous presence of barium carbonate responsible for the poor aqueous processing ability of barium titanate?
authors Ferreira, JMF; Olhero, SM; Kaushal, A
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Barium carbonate; Barium titanate; Dissolution; Dispersion; Aqueous processing
keywords POLYMERIC STABILIZATION; DISSOLUTION RATES; PART II; SUSPENSIONS; BATIO3; PH; TEMPERATURE; KINETICS; POWDERS
abstract The ubiquitous presence of barium carbonate (BaCO3 - BC) as an impurity in barium titanate (BaTiO3 - BT) has been pointed out as the main reason for the well-known difficulties found by many investigators when attempting to process BT powders in aqueous media. Different and controversial arguments have been put forward to justify the observed aqueous processing difficulties of BT, but a satisfactory explanation is still to be found. With this aim, a systematic study was here undertaken to shed further light on the solid/liquid interactions occurring at the surface of BC and BT particles and their impact on the dispersion ability of both powders, separately and mixed in certain proportions. Long term colloidal stability and high solid loadings (60 vol.%) were obtained for BC, while colloidal instability and a lower maximum content of solids (50 vol.%) could be achieved for BT. This responds to the question risen in the title. (C) 2013 Elsevier Ltd, All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2013
volume 33
issue 13-14
beginning page 2509
ending page 2517
digital object identifier (doi) 10.1016/j.jeurceramsoc.2013.05.010
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000321803400016
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