Synthesis of non-agglomerated Ba0.77Ca0.23TiO3 nanopowders by a modified polymeric precursor method
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.
KeywordsChemical synthesis BCT nanopowders BaTiO3 Pechini
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.
- 2.Mazon T, Hernandes AC, Souza AG, Moraes APA, Ayala AP, Freire PTC, Mendes J (2005) J Appl Phys 97, Art. No. 104113 Part 1Google Scholar
- 6.Silva RS, Antonelli E, Hernandes AC (in press) CerâmicaGoogle Scholar
- 12.Fang TT, Tsay JD (2001) J Am Ceram Soc 84:2475Google Scholar
- 15.Arvanitidis I, Sichen D, Seetharaman S (1996) Metall Mater Trans B27:409Google Scholar
- 19.Duran P, Capel F, Tartaj J, Moure C (2001) J Mater Res 16:197Google Scholar
- 20.Nakamoto K (1986) Infrared and raman spectra of inorganic and coordinate compounds, 4th edn. Wiley Press, New York, p 231Google Scholar