Journal of Sol-Gel Science and Technology

, Volume 42, Issue 2, pp 173–179

Synthesis of non-agglomerated Ba0.77Ca0.23TiO3 nanopowders by a modified polymeric precursor method

  • Ronaldo Santos da Silva
  • Maria Inês Basso Bernardi
  • Antonio Carlos Hernandes
Article

DOI: 10.1007/s10971-007-1554-6

Cite this article as:
da Silva, R.S., Bernardi, M.I.B. & Hernandes, A.C. J Sol-Gel Sci Technol (2007) 42: 173. doi:10.1007/s10971-007-1554-6

Abstract

In this work, we have studied the influence of the pH on the synthesis and structural properties of the Ba0.77Ca0.23TiO3 nanopowders synthesized by a modified polymeric precursor method, in order to achieve non-agglomerated powders. Synthesis, morphology, thermal reactions, crystallite and average particle size of the synthesized powders were investigated through thermal analysis (DTA/TG), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and Infrared spectroscopy. In summary, Ba0.77Ca0.23TiO3 nanopowders were synthesized for the first time at a relative low temperature (500 °C). It was also found that the alkalinity and acidity of the solution presented a great influence on the powder properties. The best results were obtained from solutions with pH = 8.5 and 11 whose nanopowders presented weakly agglomerate, with homogeneous particle size and a narrow size distribution (30–40 nm). This behavior could be explained based on the FT-IR results in which it was possible to see the increased of the chelation in higher pHs.

Keywords

Chemical synthesisBCT nanopowdersBaTiO3Pechini

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Ronaldo Santos da Silva
    • 1
  • Maria Inês Basso Bernardi
    • 1
  • Antonio Carlos Hernandes
    • 1
  1. 1.Grupo Crescimento de Cristais e Materiais Cerâmicos, Instituto de Física de São CarlosUniversidade de São PauloSão CarlosBrazil