Homogeneous (co)precipitation of inorganic salts for synthesis of monodispersed barium titanate particles

M. Z.C. Hu, G. A. Miller, E. A. Payzant, C. J. Rawn

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73 Scopus citations

Abstract

Various processes of coprecipitation or crystallization of inorganic salts of barium and titanium from homogeneous solutions were studied in this work. In particular, barium hydroxide and barium chloride salt as well as titanium tetrachloride were used as the starting materials for dielectric-tuning homogeneous precipitation in mixed solvents of isopropanol and water. Hydroxypropylcellulose was used as a steric dispersant. Evaluations of size, shape, and composition of synthesized particles were made using scanning electron microscopy, high-temperature X-ray diffractometry, and differential thermal analysis. Results show that salt concentration, pH, and reaction time are important in determining the morphology and composition of the final powder. The titania particles from dielectric-tuning precipitation are perfect microspheres with narrow size distribution (near monodispersed), while the particles from barium salts are flake-like, irregular in shape and size. Instead of particles containing uniform compositions of barium and titanium compounds, dielectric-tuning coprecipitation yielded powders of two separated phases, i.e., monodispersed titania microspheres (approx. 1 μm) coated on barium chloride salt flakes. Titanium-rich barium titanate was obtained after calcination of coprecipitated powders. However, preliminary results show that the titania particles obtained by dielectric-tuning precipitation can be hydrothermally converted to BaTiO3 particles that are fully crystallized after calcination above 950°C.

Original languageEnglish
Pages (from-to)2927-2936
Number of pages10
JournalJournal of Materials Science
Volume35
Issue number12
DOIs
StatePublished - 2000

Funding

⁄The submitted manuscript has been authored by a contractor of the U.S. Government under contract No. DE-AC05-960R22464. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes. z Author to whom all correspondence should be addressed. §Managed by Lockheed Martin Energy Research Corp., under contract DE-AC05-96OR22464 with the U.S. Department of Energy.

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