Nano-sized barium titanate powders with tetragonal crystal structure prepared by flame spray pyrolysis

D. S. Jung, S. K. Hong, J. S. Cho, Y. C. Kang

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Nano-sized BaTiO3 powders with regular morphology and tetragonal crystal structure were prepared by flame spray pyrolysis from a spray solution with citric acid. The precursor powders prepared at the low flow rates of fuel gas at 2 and 2.5 L/min had large, hollow, thin wall structures. On the other hand, the precursor powders prepared at a high flow rate of fuel gas at 4 L/min had a dense submicronic structure. Those precursor powders with a hollow, thin wall structure formed a slightly aggregated BaTiO3 of nanometer-sized primary powders after post-treatment. The slightly aggregated BaTiO3 became nano-sized powders via a simple milling process. The mean sizes of the powders changed from several tens to 200 nm when post-treatment temperatures changed from 700 to 1000 °C. The BaTiO3 powders obtained from the citric acid spray solution had tetragonal crystal structure at post-treatment temperature of 1000 °C. Conversely, those BaTiO3 powders prepared from a spray solution that did not contain citric acid had cubic crystal structures at this same post-treatment temperature.

Original languageEnglish
Pages (from-to)109-115
Number of pages7
JournalJournal of the European Ceramic Society
Volume28
Issue number1
DOIs
Publication statusPublished - 2008

Keywords

  • BaTiO and titanates
  • Capacitors
  • Powders-gas phase reaction

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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