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Agglomerate-free BaTiO3 particles by salt-assisted spray pyrolysis

Published online by Cambridge University Press:  31 January 2011

Yoshifumi Itoh ,
I. Wuled Lenggoro ,
Sotiris E. Pratsinis  and
Kikuo Okuyama
Yoshifumi Itoh
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
I. Wuled Lenggoro
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
Sotiris E. Pratsinis
Affiliation:
Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology (ETH), ETH Zurich, Zurich, CH-8092, Switzerland
Kikuo Okuyama*
Affiliation:
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
*
a)Address all correspondence to this author.okuyama@hiroshima-u.ac.jp
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Abstract

Optimum conditions for the synthesis of nonagglomerated BaTiO3 particles by salt-assisted spray pyrolysis (SASP) were investigated. The effect of particle residence time in the reactor and salt concentration on the crystallinity and surface morphology of BaTiO3 was examined by x-ray diffraction and scanning electron microscopy. Mixtures of a metal chloride or nitrate salt, dissolved in aqueous precursor solutions, were sprayed by an ultrasonic atomizer into a five-zone hot-wall reactor. By increasing the salt concentration or the particle residence time in the hot zone, the primary particle size was increased, and its surface texture was improved compared to BaTiO3 particles prepared by conventional spray pyrolysis. The SASP-prepared BaTiO3 crystal was transformed from cubic to tetragonal by simply increasing the salt concentration at constant temperature and residence time. Further thermal treatments such as calcination or annealing are not necessary to obtain nonagglomerated tetragonal BaTiO3 (200–500 nm) particles with a narrow size distribution. Increasing the carrier gas flow rate and decreasing the residence time in the hot zone resulted in cubic BaTiO3 particles about 20 nm in diameter.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3222 - 3229
Copyright
Copyright © Materials Research Society 2002

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