Journal of Sol-Gel Science and Technology

, Volume 42, Issue 2, pp 173–179 | Cite as

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

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 synthesis BCT nanopowders BaTiO3 Pechini 

Notes

Acknowledgments

The authors wish to acknowledge the financial support from the Brazilian funding agencies, FAPESP and CNPq. The authors also gratefully acknowledge R.L. Moreira for the FT-IR analysis.

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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

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