Fabrication of Barium Strontium Titanate ( Ba0.6Sr (0.4) TiO3) 3D Microcomponents from Aqueous Suspensions
authors Olhero, SM; Kaushal, A; Ferreira, JMF
nationality International
journal JOURNAL OF THE AMERICAN CERAMIC SOCIETY
keywords SOLID-SOLUTIONS; POLYMERIC STABILIZATION; MICROWAVE APPLICATIONS; DIELECTRIC-PROPERTIES; AMMONIUM-SALT; SPINEL POWDER; BATIO3; DISPERSION; MEDIA; DEPENDENCE
abstract This study reports on the fabrication of BST (Ba0.6Sr0.4TiO3)-based 3D microcomponents through an aqueous colloidal approach. The BST powder was synthesized by solid-state reaction assisted by thermal analysis and XRD diffraction. Well crystalline cubic BST single phase was obtained upon heat-treating the precursor powder mixture at 1200 degrees C-1250 degrees C. The reactivity of the BST powder toward water was evaluated by the changes in pH and concentration of leached ionic species along aging time. Hydrolysis reactions were suppressed by chemisorbing a suitable phosphate-based protective agent and enabled an excellent dispersion ability to be achieved. Aqueous suspensions with solids loadings as high as 50vol% that are stable against hydrolysis for several days could easily be prepared from the surface-treated BST powder in aqueous solutions of an epoxy resin. After adding a suitable hardener, the colloidal suspensions could easily be cast into soft silicon rubber molds to obtain homogeneous and high dense green BST bodies.
publisher WILEY-BLACKWELL
issn Feb-20
year published 2014
volume 97
issue 3
beginning page 725
ending page 732
digital object identifier (doi) 10.1111/jace.12756
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000332195700012
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journal impact factor 3.502
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